Relevant bibliographies by topics / Knee flexion angle

Academic literature on the topic 'Knee flexion angle'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Knee flexion angle"

1

Chung, Kwangho, Chong Hyuk Choi, Sung-Hwan Kim, Sung-Jae Kim, Woosung Do, and Min Jung. "The Relationship Between Lateral Femoral Anatomic Structures and the Femoral Tunnel Outlet in Anterior Cruciate Ligament Reconstruction Using the Transportal Technique: A 3-Dimensional Simulation Analysis." Orthopaedic Journal of Sports Medicine 8, no. 9 (September 1, 2020): 232596712095278. http://dx.doi.org/10.1177/2325967120952783.

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Background: The relationship between the lateral femoral anatomic structures and femoral tunnel outlet according to changes in knee flexion and transverse drill angle during femoral tunnel creation in anterior cruciate ligament (ACL) reconstruction remains unclear. Purpose: To investigate the relationships between the lateral femoral anatomic structures and femoral tunnel outlet according to various knee flexion and transverse drill angles and to determine appropriate angles at which to minimize possible damage to the lateral femoral anatomic structures. Study Design: Controlled laboratory study. Methods: Simulation of ACL reconstruction was conducted using a 3-dimensional reconstructed knee model from the knees of 30 patients. Femoral tunnels were created using combinations of 4 knee flexion and 3 transverse drill angles. Distances between the femoral tunnel outlet and lateral femoral anatomic structures (minimum safe distance, 12 mm), tunnel length, and tunnel wall breakage were assessed. Results: Knee flexion and transverse drill angles independently affected distances between the femoral tunnel outlet and lateral femoral anatomic structures. As knee flexion angle increased, the distance to the lateral collateral ligament, lateral epicondyle, and popliteal tendon decreased, whereas the distance to the lateral head of the gastrocnemius increased ( P < .001). As the transverse drill angle decreased, distances to all lateral femoral anatomic structures increased ( P < .001). Considering safe distance, 120°, 130°, or 140° of knee flexion and maximum transverse drill angle (MTA) could damage the lateral collateral ligament; 130° or 140° of knee flexion and MTA could damage the lateral epicondyle; and 110° or 120° of knee flexion and MTA could damage the lateral head of the gastrocnemius. Tunnel wall breakage occurred under the conditions of MTA – 10° or MTA – 20° with 110° of knee flexion and MTA – 20° with 120° of knee flexion. Conclusion: Approximately 120° of knee flexion with MTA – 10° and 130° or 140° of knee flexion with MTA – 20° or MTA – 10° could be recommended to prevent damage to the lateral femoral anatomic structures, secure adequate tunnel length, and avoid tunnel wall breakage. Clinical Relevance: Knee flexion angle and transverse drill angle may affect femoral tunnel creation, but thorough studies are lacking. Our findings may help surgeons obtain a stable femoral tunnel while preventing damage to the lateral femoral anatomic structures.
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Iriuchishima, Takanori, and Keinosuke Ryu. "A Comparison of Rollback Ratio between Bicruciate Substituting Total Knee Arthroplasty and Oxford Unicompartmental Knee Arthroplasty." Journal of Knee Surgery 31, no. 06 (July 25, 2017): 568–72. http://dx.doi.org/10.1055/s-0037-1604445.

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AbstractThe purpose of this study was to compare the rollback ratio in bicruciate substituting (BCS) total knee arthroplasty (TKA) and bicruciate-retaining Oxford unicompartmental knee arthroplasty (UKA). In this study, 64 subjects (64 knees) undergoing BCS-TKA (Journey II: Smith and Nephew) and 50 subjects (50 knees) undergoing Oxford UKA (Zimmer-Biomet holdings, Inc., IN) were included. Approximately 6 months after surgery, and when the subjects had recovered their knee range of motion, following the Laidlow's method, lateral radiographic imaging of the knee was performed with active full knee flexion. The most posterior tibiofemoral contact point was measured for the evaluation of femoral rollback (rollback ratio). Flexion angle was also measured using the same radiograph and the correlation of rollback and flexion angle was analyzed. As a control, radiographs of the asymptomatic contralateral knees of subjects undergoing Oxford UKA were evaluated (50 knees). The rollback ratios of the BCS-TKA, Oxford UKA, and control knees were 37.9 ± 4.9, 35.7 ± 4.2, and 35.3 ± 4.8% respectively. No significant difference in rollback ratio was observed among the three groups. The flexion angles of the BCS-TKA, Oxford UKA, and control knees were 123.8 ± 8.4, 125.4 ± 7.5, and 127 ± 10.3 degrees, respectively. No significant difference in knee flexion angle was observed among the three groups. Significant correlation between rollback ratio and knee flexion angle was observed (p = 0.002; Pearson's correlation coefficient = − 0.384). BCS-TKA showed no significant difference in rollback ratio when compared with control knees and Oxford UKA knees. The BCS-TKA design is likely to reproduce native anterior cruciate ligament and posterior cruciate ligament function, and native knee rollback.
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Kim, Sung-Hwan, Sung-Jae Kim, Chong Hyuk Choi, Dohyun Kim, and Min Jung. "Optimal Condition to Create Femoral Tunnel Considering Combined Influence of Knee Flexion and Transverse Drill Angle in Anatomical Single-Bundle ACL Reconstruction Using Medial Portal Technique: 3D Simulation Study." BioMed Research International 2018 (July 17, 2018): 1–10. http://dx.doi.org/10.1155/2018/2643247.

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There has been no previous study using three-dimensional (3D) measurement on femoral tunnel characteristics according to the combined influence of various flexion angles of knee and transverse drill angles in single-bundle ACL reconstruction with transportal technique. The purpose of this study was to determine optimal condition of knee flexion angle and transverse drill angle to create secure femoral tunnel in single-bundle ACL reconstruction with transportal technique considering tunnel length, tunnel wall breakage, and graft bending angle. This study was conducted using simulation of 3D computed tomography of thirty subjects. Three variables of femoral tunnel changed according to combined influence of four flexion angles of knee and three transverse drill angles were measured: tunnel length, wall breakage, and graft bending angle. There was no case of short femoral tunnel less than 25 mm at 120° and 130° of flexion. There was no case of breakage of femoral tunnel at 120° of flexion with maximum transverse drill angle (MTA) and MTA-10° and at 130° of flexion. Considering effect on graft bending angle, decrease of flexion angle and transverse drill angle could be appropriate in creating femoral tunnel. Increased flexion angle and transverse drill angle secured femoral tunnel having sufficiently long length without wall breakage. However, avoiding excessive flexion angle and maximum transverse drill angle could be recommended because they tended to cause more acute graft bending angle.
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Ahmad, Christopher S., Zohara A. Cohen, William N. Levine, Thomas R. Gardner, Gerard A. Ateshian, and Van C. Mow. "Codominance of the Individual Posterior Cruciate Ligament Bundles: An Analysis of Bundle Lengths and Orientation." American Journal of Sports Medicine 31, no. 2 (March 2003): 221–25. http://dx.doi.org/10.1177/03635465030310021101.

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Background: It is unclear how each bundle of the posterior cruciate ligament contributes to posterior knee stability. Hypothesis: Changes in bundle orientation and length occur such that neither bundle dominates in restraining posterior tibial motion throughout knee flexion and extension. Study Design: Controlled laboratory study. Methods: Six fresh-frozen cadaveric knees were studied in a joint-testing rig with individual quadriceps and hamstring muscle loading. Kinematic data for the tibia and femur were obtained at knee flexion angles from 0° to 120°. The joint was then disarticulated, and the insertions of the two bundles on the tibia and femur were digitized. Results: Length of the anterolateral bundle increased with increasing knee flexion angle from 10° to 120°. Length of the posteromedial bundle decreased with increasing knee flexion angle from 0° to 45° and increased slightly from 60° to 120°. Length of the anteromedial bundle was significantly less than that of the posteromedial at 0°, 10°, and 20° of knee flexion. The anterolateral bundle was significantly more horizontal at flexion angles of 0°, 10°, 20°, 30°, and 45° (P < 0.05). The posteromedial bundle was more horizontal at 120°. Conclusions: Changes in orientation take place such that neither bundle dominates in restraining posterior tibial motion throughout knee flexion and extension. Clinical Relevance: Double-bundle reconstructions achieve more physiologic knee function.
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Usami, Takuya, Kazuki Nishida, Hirotaka Iguchi, Taro Okumura, Hiroaki Sakai, Ruido Ida, Mitsuya Horiba, et al. "Evaluation of lower extremity gait analysis using Kinect V2® tracking system." SICOT-J 8 (2022): 27. http://dx.doi.org/10.1051/sicotj/2022027.

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Introduction: Microsoft Kinect V2® (Kinect) is a peripheral device of Xbox® and acquires information such as depth, posture, and skeleton definition. In this study, we investigated whether Kinect can be used for human gait analysis. Methods: Ten healthy volunteers walked 20 trials, and each walk was recorded by a Kinect and infrared- and marker-based-motion capture system. Pearson’s correlation and overall agreement with a method of meta-analysis of Pearson’s correlation coefficient were used to assess the reliability of each parameter, including gait velocity, gait cycle time, step length, hip and knee joint angle, ground contact time of foot, and max ankle velocity. Hip and knee angles in one gait cycle were calculated in Kinect and motion capture groups. Results: The coefficients of correlation for gait velocity (r = 0.92), step length (r = 0.81) were regarded as strong reliability. Gait cycle time (r = 0.65), minimum flexion angle of hip joint (r = 0.68) were regarded as moderate reliability. The maximum flexion angle of the hip joint (r = 0.43) and maximum flexion angle of the knee joint (r = 0.54) were regarded as fair reliability. Minimum flexion angle of knee joint (r = 0.23), ground contact time of foot (r = 0.23), and maximum ankle velocity (r = 0.22) were regarded as poor reliability. The method of meta-analysis revealed that participants with small hip and knee flexion angles tended to have poor correlations in maximum flexion angle of hip and knee joints. Similar trajectories of hip and knee angles were observed in Kinect and motion capture groups. Conclusions: Our results strongly suggest that Kinect could be a reliable device for evaluating gait parameters, including gait velocity, gait cycle time, step length, minimum flexion angle of the hip joint, and maximum flexion angle of the knee joint.
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Young, Warren, Peter Clothier, Leonie Otago, Lyndell Bruce, and David Liddell. "Relationship Between a Modified Thomas Test and Leg Range of Motion in Australian-Rules Football Kicking." Journal of Sport Rehabilitation 12, no. 4 (November 2003): 343–50. http://dx.doi.org/10.1123/jsr.12.4.343.

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Context:Flexibility tests are sometimes thought to be related to range of motion in dynamic activities, but such a relationship remains to be determined.Objective:To determine the correlation between flexibility and hip and knee angles in Australian football kicking.Design:Correlation.Setting:Biomechanics laboratory.Participants:16 Australian Rules football players.Main Outcome Measures:Hip and knee angles of the preferred kicking leg in a relaxed position were determined with a modified Thomas test. Maximum hip extension, the knee-flexion angle in this position, the maximum knee-flexion angle, and the hip angle at this position during the swing phase of maximum-effort drop-punt kicks were determined.Results:Significant correlations were found between hip flexibility and maximum hip extension (r = .65, P < .01) and hip angle at the maximum knee-flexion angle (r = .70, P < .01).Conclusions:The data indicate a moderate association between hip flexibility and hip angles during kicking.
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GERRITS, Karin, Inge GOMMANS, Baziel VAN ENGELEN, and Arnold DE HAAN. "Quadriceps weakness in a family with nemaline myopathy: influence of knee angle." Clinical Science 105, no. 5 (November 1, 2003): 585–89. http://dx.doi.org/10.1042/cs20030159.

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Nemaline myopathy is a congenital neuromuscular disorder, which primarily affects the thin filaments. Clinically the most important feature is muscle weakness; however, this weakness is poorly understood. The present investigation aimed to determine the torque angle relationship of the knee extensor muscles during in vivo muscle contractions in a family with a novel phenotype of nemaline myopathy. The results of this study show that quadriceps weakness occurs predominantly at higher knee flexion angles, but relatively normal strength was found at angles closer to full knee extension. When the relative torque angle relationships were considered, torque loss at smaller than optimum knee flexion angle was greater in the patients compared with the controls. In addition, the optimum angle for maximal quadriceps torque production was shifted towards smaller knee flexion angles in the patients. This suggests that a weakness specifically at higher knee flexion angles probably occurs as a result of adaptations consequently to the disease. Furthermore, it is important to assess muscle function at different joint positions to allow adequate interpretation of muscle weakness.
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Wang, Wei, Bin Yue, JianHua Wang, Hany Bedair, Harry Rubash, and Guoan Li. "Posterior Condyle Offset and Maximum Knee Flexion Following a Cruciate Retaining Total Knee Arthroplasty." Journal of Knee Surgery 32, no. 02 (March 7, 2018): 146–52. http://dx.doi.org/10.1055/s-0038-1636912.

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Inconsistent data has been reported on the effect of the femoral posterior condyle offset (PCO) on the maximal knee flexion after total knee arthroplasty (TKA). This study investigated the relationship between the postoperative changes of the PCO and the changes of maximal knee flexion after a cruciate retaining (CR) TKA. Nine patients with medial osteoarthritis (OA) in one knee were investigated. Before operation, each index knee was magnetic resonance imaging (MRI) scanned for construction of a three-dimensional (3D) knee model. The patient then performed a maximal weight-bearing (WB) flexion and the index knee flexion was measured using a dual fluoroscopy technique. At an average of 8 months after a CR TKA, all patients performed the same WB knee flexion. The postoperative changes of the PCO, the posterior cruciate ligament (PCL) elongation, and the posterior tibial slope (PTS) were determined. The postoperative changes of maximal knee flexion were determined by comparing with the preoperative maximal flexion angles of the knee. The correlations of the postoperative changes of PCO and PTS with the postoperative changes of the maximal flexion angle and PCL elongation of the knee were analyzed. The preoperative PCO (28.5 ± 4.5 mm) was significantly smaller than the postoperative PCO (31.1 ± 5.1 mm) (p < 0.05). The increasing of PCO after surgery is correlated with the decreasing of maximal knee flexion angle (r = 0.74) and the increasing of PCL elongation (r = 0.64) after the TKA. The PTS was not found to change significantly after the TKA and was not significantly correlated to the maximal knee flexion angle and PCL elongation. The postoperative increases of the PCO were shown to cause overstretching of the PCL and poor flexion angle of the knee after the CR TKA. Restoration of PCO could help optimize the maximal flexion of the knee after the TKA with consideration about PCL tension.
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Batty, Lachlan M., Julian A. Feller, Iswadi Damasena, Gerrit Behrens, Brian M. Devitt, Taylor Hartwig, Jodie A. McClelland, and Kate E. Webster. "Single-Leg Squat After Anterior Cruciate Ligament Reconstruction: An Analysis of the Knee Valgus Angle at 6 and 12 Months." Orthopaedic Journal of Sports Medicine 8, no. 8 (August 1, 2020): 232596712094632. http://dx.doi.org/10.1177/2325967120946328.

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Background: Deficits in neuromuscular control are common after anterior cruciate ligament (ACL) reconstruction and may be associated with further knee injury. The knee valgus angle during a single-leg squat (SLS) is one measure of neuromuscular performance. Purpose: To determine whether the knee valgus angle during SLS changes between 6 and 12 months after ACL reconstruction and to assess how the operative knee valgus angle compares with that of the contralateral side. Study Design: Case series; Level of evidence, 4. Methods: A cohort of 100 patients with uninjured contralateral knees were assessed at 6 and 12 months after primary hamstring autograft ACL reconstruction. Participants performed the SLS on each leg, and the knee valgus angle was measured via frame-by-frame video analysis at 30° of flexion and at each patient’s maximum knee flexion angle. Results: For the operative limb at 30° of flexion, a small but statistically significant reduction was noted in the valgus angle between 6 and 12 months (5.46° vs 4.44°; P = .002; effect size = 0.24). At 6 months, a slightly higher valgus angle was seen in the operative limb compared with the nonoperative limb (5.46° vs 4.29°; P = .008; effect size = 0.27). At maximum flexion, no difference was seen between limbs in the valgus angle at either 6 or 12 months, and no change was seen in the operative limb between 6 and 12 months. At 6 months and 30° of knee flexion, 13 patients had a valgus angle greater than 10°. This group also had a higher mean valgus angle in the contralateral limb compared with the contralateral limb in the other 87 patients (8.5° vs 3.65°; P < .001). Conclusion: During a controlled SLS, the knee valgus angle remained essentially constant, and minimal limb asymmetries were present over the 6- to 12-month postoperative period, a time when athletes typically increase their activity levels. Whether changes or asymmetries will be seen with more dynamically challenging tasks remains to be determined. When present, high valgus angles were commonly bilateral.
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Walsh, Meghan, Michelle C. Boling, Melanie McGrath, J. Troy Blackburn, and Darin A. Padua. "Lower Extremity Muscle Activation and Knee Flexion During a Jump-Landing Task." Journal of Athletic Training 47, no. 4 (July 1, 2012): 406–13. http://dx.doi.org/10.4085/1062-6050-47.4.17.

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Context: Decreased sagittal-plane motion at the knee during dynamic tasks has been reported to increase impact forces during landing, potentially leading to knee injuries such as anterior cruciate ligament rupture. Objective: To describe the relationship between lower extremity muscle activity and knee-flexion angle during a jump-landing task. Design: Cross-sectional study. Setting: Research laboratory. Patients or Other Participants: Thirty recreationally active volunteers (15 men, 15 women: age = 21.63 ± 2.01 years, height = 173.95 ± 11.88 cm, mass = 72.57 ± 14.25 kg). Intervention(s): Knee-flexion angle and lower extremity muscle activity were collected during 10 trials of a jump-landing task. Main Outcome Measure(s): Simple correlation analyses were performed to determine the relationship between each knee-flexion variable (initial contact, peak, and displacement) and electromyographic amplitude of the gluteus maximus (GMAX), quadriceps (VMO and VL), hamstrings, gastrocnemius, and quadriceps : hamstring (Q : H) ratio. Separate forward stepwise multiple regressions were conducted to determine which combination of muscle activity variables predicted each knee-flexion variable. Results: During preactivation, VMO and GMAX activity and the Q : H ratio were negatively correlated with knee-flexion angle at initial contact (VMO: r = −0.382, P = .045; GMAX: r = −0.385, P = .043; Q : H ratio: r = −0.442, P = .018). The VMO, VL, and GMAX deceleration values were negatively correlated with peak knee-flexion angle (VMO: r = −0.687, P = .001; VL: r = −0.467, P = .011; GMAX: r = −0.386, P = .043). The VMO and VL deceleration values were negatively correlated with knee-flexion displacement (VMO: r = −0.631, P = .001; VL: r = −0.453, P = .014). The Q : H ratio and GM activity predicted 34.7% of the variance in knee-flexion angle at initial contact (P = .006). The VMO activity predicted 47.1% of the variance in peak knee-flexion angle (P = .001). The VMO and VL activity predicted 49.5% of the variance in knee-flexion displacement (P = .001). Conclusions: Greater quadriceps and GMAX activation and less hamstrings and gastrocnemius activation were correlated with smaller knee-flexion angles. This landing strategy may predispose an individual to increased impact forces due to the negative influence on knee-flexion position.
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Dissertations / Theses on the topic "Knee flexion angle"

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Stanley, Christopher J. Yu Bing. "Effects of knee extension constraint on knee flexion angle and ground reaction forces after ACL reconstruction." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2006. http://dc.lib.unc.edu/u?/etd,532.

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Thesis (M.S.)--University of North Carolina at Chapel Hill, 2006.
Title from electronic title page (viewed Oct. 10, 2007). "... in partial fulfillment of the requirements for the degree of Master of Science in the Department of Human Movement Science." Discipline: Human Movement Science; Department/School: Medicine.
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Wong, Kam-kwong, and 黃淦剛. "Static pressure measurement of the patellofemoral joint in deep knee flexion with alteration of Q-angle." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B4501047X.

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Walsh, Meghan C. Padua Darin A. "The relationship between lower extremity muscle activity and knee flexion angle during a jump-landing task." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2008. http://dc.lib.unc.edu/u?/etd,1932.

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Thesis (M.A.)--University of North Carolina at Chapel Hill, 2008.
Title from electronic title page (viewed Dec. 11, 2008). "... in partial fulfillment of the requirements for the degree of Master of Arts in the Department of Exercise and Sports Science Athletic Training." Discipline: Exercise and Sports Science; Department/School: Exercise and Sport Science.
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Robinson, Erin Kathleen. "Differences in Maximal Speed Running Between Baseball Players and Sprinters." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd751.pdf.

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Most, Ephrat 1970. "The biomechanics of knees at high flexion angles before and after Total Knee Arthroplasty." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/17946.

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Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2004.
Includes bibliographical references (leaves 215-234).
Total Knee Arthroplasty (TKA) was initially developed to alleviate pain in the case of severe arthritis of the knee. Restoration of knee motion has been an on going issue for the last decade. Contemporary TKAs appear to provide good knee function in the range of zero to 120⁰ of flexion for most patients. However, many patients rarely can flex tier knees beyond 120⁰ after TKA. Limited information is available regarding the biomechanics of the knee beyond 120⁰ of flexion. Little is known about the biomechanical function of the posterior cruciate ligament in cruciate retaining TKA designs and the interaction of the cam-spine mechanism in posterior-stabilized TKA designs at flexion angles greater than 120⁰. The role of soft tissue constraint at high flexion angles has not yet been explored. The objective of this work was to investigate the biomechanics of the knee at high flexion angles before and after TKA. An in vitro experimental robotic set-up was used to measure six degrees-of-freedom kinematics and soft tissue kinetics of the intact knee. Contemporary TKA designs were then tested on the same specimen using this system to examine the limitations of currently available components to achieve high knee flexion. Both passive and muscle load kinematics were examined. Femoral translation and tibial rotation of the reconstructed knees were compared with that of the intact knees from full extension to 150⁰ of flexion. The study showed that in the intact knee, the amount of posterior femoral translation increased with increasing flexion angles on the passive path and under simulated muscle loads. Similar trend was noted for all TKAs. Yet, after any TKA, the knee exhibited a reduction in posterior femoral translation relative to the intact knee. The
(cont.) posterior cruciate ligament in all knees carried lower load at high flexion as compared to the peak load it carried at mid knee flexion. The engagement of the femoral cam with the polyethylene spine in a posterior-stabilized TKA was correlated with an increasing posterior femoral translation. The function of the menisci was not simulated by any of the TKAs. In all knees, the compression of the posterior soft tissue at high knee flexion was correlated with an increase of posterior femoral translation. It is proposed that posterior femoral translation and internal tibial rotation ate high knee flexion are necessary but not sufficient features in achieving high knee flexion. Factors such as posterior soft tissue compression and contact mechanics should be considered.
by Ephrat Most.
Sc.D.
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Walusz, Hollie Janine Padua Darin A. "The relationship between knee flexion, hip flexion, and trunk flexion angles and anterior tibial shear force during a jump-landing task." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2007. http://dc.lib.unc.edu/u?/etd,906.

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Thesis (M.A.)--University of North Carolina at Chapel Hill, 2007.
Title from electronic title page (viewed Dec. 18, 2007). "... in partial fulfillment of the requirements for the degree of Master of Arts in the Department of Exercise and Sport Science (Athletic Training)." Discipline: Exercise and Sports Science; Department/School: Exercise and Sport Science.
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Greene, Peter J. "Design and analysis of a knee and ankle flexing hybridorthosis for paraplegic ambulation." Thesis, University of Strathclyde, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273398.

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Chun-Han, Chia, and 賈俊瀚. "The effects of different the knee flexion angle of the support leg on the stroking performance in the Canadian canoe." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/33149609061758966786.

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碩士
國立臺灣體育運動大學
體育研究所
104
This study aimed to discern the characteristics and differences on motion of stroke and impact on performance of stroke with four different knee angles (optional angle, 90 degrees, 105 degrees, 120 degrees) of the support leg of canoeing in canoe sprint. Methods: 10 canoe athletes were invited in this study. Each participant finished 15 seconds sprint paddling of canoeing with each angle randomly on canoe ergometer. The data collected from the canoe ergometer was analyzed by One-way repeated measure ANOVA. The motion of each participant was analyzed by Vicon 3D motion analysis system. Results: The optional support leg knee angle is 137 ± 15.72 degrees. The positions when the blade was just into the water were not significantly different among four knee angles of support leg. During the stroke, the velocity of trunk tilt and shoulder rotation is faster in optional angle of support leg than 90 degrees. About the performance of stroke, the displacement and velocity is farther and faster in optional angle of support leg than 90 degrees. Moreover, there is no significantly different stroke motion and stroke performance between the knee angle of support leg 105 degrees and 120 degrees. Conclusion: The knee angle of support leg has an influence on the motion and the performance of stroke.
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CHEN, YING-JU, and 陳瀅如. "Discussion on The Effect of Early Ambulation on The Quality of Life and Degree of Recovery of Knee Flexion Angle after Replacement of Knee ---A Series Study of A District Hospital in Taiping." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/d5wf88.

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碩士
中臺科技大學
醫療暨健康產業管理系碩士班
106
Reduce pain of patient after knee replacement is achieved and known, but health and quality of life improvement was nearly unknown. The purpose of this study is discussion of improvement of life quality of early postoperative exercise and restore movement angle after knee replacement. The purpose of this study include: 1) the difference between early postoperative exercise and regular arranged rehabilitation schedule; 2) life quality difference between KOOS and SF-36? Study method: sampling from Taichung Hospital between 2018/04-2018/7, all patients received TKA. UKA and revision-TKA patients were excluded. Retrospective study of following 16 patients early excised at the same day of operation and 16 patients with regular scheduled rehabilitation. using KOOS for knee situation and SF-36 for preoperative quality of life evaluation. SPSS and Chi-square test were used for analysis. Study result: 1) Descriptive statistics of the experimental group and the control group: Most of the patients are older, slightly more female than male; more obese than the general body. 2) Using the KOOS scale measurement results statistical analysis found that compared with the control group before and after the percentage of changes, the experimental group in daily life activities (ADL), sports and entertainment (Sport/Rec) and knee-related quality of life (QOL) showed significant improvement, but there was no significant difference in pain (Pain) and Symptom (Symptom). 3) Statistical analysis using the SF-36 scale measurement results showed that there was no significant change in the physiological state (PCS) of the experimental group compared with the control group before and after surgery, but it was significantly improved in the mental state (MCS). Especially improved in the social function (SF) part. Conclusion: The difference between the KOOS and SF-36 questionnaires before and after surgery was finally concluded. The improvement of the KOOS part--ADL, Sport/REC and QOL in the experimental group who got out of bed on the day Quite large, in the SF-36 part, the experimental group MCS >PCS, proved that the experimental group had significant improvement in daily life activities, exercise and entertainment, knee-related life quality, social function and psychological level. When encouraging patients to get out of bed early, the improvement of knee joint activity angle is obviously positively correlated with the improvement of health-related quality of life. Therefore, in the future, in the future, it is expected to actively guide patients to get out of bed and let patients with artificial knee joint surgery. Better care and prognosis can be achieved, and hospital stays can be reduced, and health care costs are reduced.
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Kao, Fu-Yuan, and 高富員. "Quantify Knee Flexion Crouch Gait Waveform Differences in Spastic Diplegic Cerebral Palsy with Ankle-Foot Orthoses." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/68669505452045399270.

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碩士
國立臺灣大學
醫學工程學研究所
99
Objective: Ankle-foot orthoses (AFOs) are designed to correct the abnormal gait pattern in patients with celebral palsy. There were many studies which used gait analysis to test various types of AFOs for CP patients in their kinematics and kinetics performance. Many studies thought of AFOs as treatment intervention could improve pathological joint movement especially for ankle joint. But most of past studies concluded that AFOs can not improve knee and hip joints in the lower extremity. This study would use principal component analysis(PCA) to quantify the dynamic gait waveform and compare different types of AFOs for cerebral palsy with crouch gait. Methods: Nine spastic diplegic cerebral palsy patients with flexed knee gait (seven boys and two girls) anticipated in this study. Patients were recruited in this study, including those who had greater knee flexion angle (more than 10 degrees) in stance phase. There were three conditions including shoes only (SHOE), hinged ankle-foot orthoses (HAFO), and solid ankle-foot orthoses (SAFO) to test the biomechanical effects of AFOs. We collected kinematic and kinetic data to calculate joint angles, moments, joint powers, and use principal component analysis to analyze critical gait parameters. For enhancing comparisons between different orthotic conditions, All participants were separated into three groups depending on the pair of the orthotic intervention: (a) group 1: SHOE -HAFO (b) group 2: SHOE-SAFO (c) group 3: HAFO-SAFO. Results: There were some significant differences between groups in the joint angles. The SAFOs condition decreased ankle dorsiflexion angle, knee flexion angle and hip flexion angle when comparing with the SHOE and the HAFOs conditons. But HAFOs condition revealed more power absorption as well as power generation in the late stance phase when comparing with the SHOE and the SAFOs conditions. And the HAFOs condition also increased ankle plantar flexion moment in stance phase when comparing with the SHOE condition. Conclusion: The characteristic of the Principal component analysis could use fewer data to describe complex data structure effectively, especially in high homogeneous one or more conditions. Besides, principal component analysis considered the whole time period, not single gait event. The use of the PCA could analyze more objective and comprehensive in our study. And our study showed that SAFOs could decrease ankle dorsiflexion, knee flexion joint and hip flexion angle during gait. Although HAFOs could improve ankle joint angle, there were no significant improvement on knee flexion gait pattern. For spastic diplegic cerebral palsy patients with crouch gait, the results supported solid ankle-foot orthosis as effective treatments for patients with couch gait pattern.
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Books on the topic "Knee flexion angle"

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Cohen, Jeffrey A., Justin J. Mowchun, Victoria H. Lawson, and Nathaniel M. Robbins. A 41-Year-Old Male with Foot Drop and Malaise. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780190491901.003.0018.

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Distal, symmetric polyneuropathy can occur in a number of conditions including in association with HIV infection. The most common neurologic complication of HIV infection is a painful, distal sensory polyneuropathy (HIV-DSP). Other neuromuscular manifestations of HIV are myriad especially in the setting of fluctuating immunocompetence and the potential impact of neurotoxic medications. In the patient described in the case, peroneal neuropathy as the cause for foot drop is suggested by ankle dorsiflexion and eversion weakness with preservation of inversion and knee flexion strength. Mononeuropathy in the setting of HIV should prompt consideration of vasculitic, lymphomatous, and infectious causes, some of which can manifest with systemic findings. A rare neuromuscular complication of HIV-infected patients with sicca symptoms suggestive of Sjogren’s syndrome is diffuse infiltrative lymphocytosis syndrome. This syndrome can manifest as an acute or subacute painful sensory polyneuropathy but also as a mononeuropathy multiplex. This is discussed in the chapter.
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Book chapters on the topic "Knee flexion angle"

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Zhu, Z., Y. Zhang, H. Shao, H. Ding, and G. Wang. "An in Vivo Study of the Dynamic Q Angle of the Knee Joint during Flexion." In IFMBE Proceedings, 234–37. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-29305-4_63.

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Huijing, P. A., A. E. Greuell, M. H. Wajon, and R. D. Woittiez. "An Analysis of Human Maximal Isometric Voluntary Plantar Flexion as a Function of Ankle and Knee Joint Angle." In Biomechanics: Basic and Applied Research, 667–72. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3355-2_96.

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Fua-Nizan, Rosdayanti, Ahmad Majdi Abdul Rani, Mohamad Yazid Din, and Suresh Chopra. "Preliminary Study of Stress Distribution on Modified Femoral Component of Knee Implant at Maximum Flexion Angle." In Advances in Material Sciences and Engineering, 17–22. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-8297-0_3.

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Anwar, Tanvir, Khairul Anam, and Adel Al Jumaily. "EMG Signal Based Knee Joint Angle Estimation of Flexion and Extension with Extreme Learning Machine (ELM) for Enhancement of Patient-Robotic Exoskeleton Interaction." In Neural Information Processing, 583–90. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-26532-2_64.

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Hu, Z., GCW Man, KH Yeung, WH Cheung, WCW Chu, SW Law, TP Lam, Z. Zhu, Y. Qiu, and JCY Cheng. "Age- and gender-related normative value of whole-body sagittal alignment based on 584 asymptomatic Chinese adult population from age 20 to 89." In Studies in Health Technology and Informatics. IOS Press, 2021. http://dx.doi.org/10.3233/shti210437.

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To establish the age- and sex-related normative values of sagittal alignment in asymptomatic Chinese adults, and to investigate the changes and possible associated compensation mechanisms across age groups. 584 asymptomatic Chinese adults aged 20–89 years were recruited. Subjects were grouped according to age and gender. Whole-body standing radiographs were acquired for evaluating sagittal alignment from spine to lower limb. Sagittal parameters between gender in different age groups were compared via independent t test. Pearson correlation analysis was used to demonstrate relationships between parameters. Thoracic kyphosis (TK) increased steadily while lumbar lordosis decreased gradually in both genders. Pelvic tilt (PT) in male is greater than in female across all age groups with age related gradual increase. There were significant differences between male and female from 20s to 60s in terms of knee flexion angle (KA) and ankle dorsiflexion angle (AA), but the differences were not significant after 60s. T1 pelvic angle (TPA) was significantly correlated with spinal, pelvic and lower-limb alignment. The older group (≥50 years) had a stronger correlation of TPA with PT and KA, whereas the younger (<50 years) had stronger correlation with TK. This study comprehensively presented the normative sagittal alignment based on a large asymptomatic population, which could serve as an age- and gender-specific reference value for spine surgeons when planning for correction surgery. Age can influence the recruitment of compensation mechanism that involve more pelvic and lower limb mechanisms for elderly people.
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Chen, Yu-Luen, and Te-Son Kuo. "A Feedback Controlled FES in Rehabilitation." In Handbook of Research on Personal Autonomy Technologies and Disability Informatics, 144–53. IGI Global, 2011. http://dx.doi.org/10.4018/978-1-60566-206-0.ch009.

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A feedback control functional electrical stimulation (FES) system was proposed to prevent quadriceps weakness and drop-foot of the hemiplegia during gait training. The FES system is triggered by a footswitch on the heel of the affected foot to stimulate the tibialis anterior muscle for dorsi-flexion and to turn-off the knee locker in the swing phase through the main controller. The footswitch on the heel of the affected-side can be used to stimulate the quadriceps and turn-on the knee locker for quadriceps weakness in the stance phase. It was revealed that the mean velocity, cadence, stride length, active ankle motion range and functional ambulation category (FAC) were significantly improved. A paired t-test indicated that the differences in the electromyography (EMG) of the tibialis anterior and the quadriceps muscles between patient’s affected foot and unaffected foot were not significant (p>0.05) after 16 weeks of training. The proposed knee locker device with closed-loop FES system is capable of providing a hemiplegic patient with regular walking restoration after appropriate gait training.
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Conference papers on the topic "Knee flexion angle"

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Reanaree, Parkbhum, and C. Pintavirooj. "Novel limited knee flexion angle device." In 2017 10th Biomedical Engineering International Conference (BMEiCON). IEEE, 2017. http://dx.doi.org/10.1109/bmeicon.2017.8229172.

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Patterson, Rita M., William L. Buford, James M. Fay, Carl J. Nelson, and F. Marty Ivey. "Comparison of Knee Flexion Angle Using Two Measurement Techniques." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0190.

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Abstract The motion across human joints is in general three-dimensional. Past researchers have1–4 studied the motion of the tibia with respect to the femur and discussed the application of several 2-D graphical methods to injury diagnosis and fixed axis prosthesis design. Others have studied the six degree of freedom motion of the knee.5,6 Though there are many reports of knee kinematics, most have reported large variations between measurements and conflicting results. The large variation makes it difficult to draw conclusions about normal knee kinematics.
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Tung, Wayne, H. Kazerooni, Dong Jin Hyun, and Stephan McKinley. "On the Design and Control of Exoskeleton Knee." In ASME 2013 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/dscc2013-4035.

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This paper describes a lightweight (2.7 pounds) exoskeleton orthotics knee which provides controllable resisting torque. In particular, exoskeleton knee uses friction forces between two surfaces to provide resistive torque and impede knee flexion. Creating an impeding torque at the exoskeleton knee will decrease the torque that needs to be provided by the wearer at his/her knee during flexion. The required external power (from batteries) to provide the controllable resistive torque is minimal in comparison to the dissipated locomotion power since the resistive torque generation is “self-energizing” and is using the energy of the knee itself for braking. The exoskeleton knee uses the absolute angle of the thigh for basic functionality; no other measurements such as ground reaction force or the knee joint angle are necessary for basic performance. This allows the exoskeleton knee to be worn not only independently on the wearer’s knee but also in conjunction with hip, ankle or foot exoskeletons. This gives a great deal of flexibility for use of exoskeleton knees in variety of medical, civilian and military applications.
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Yongbin Qi, Cheong Boon Soh, Erry Gunawan, Kay-Soon Low, and Arash Maskooki. "Measurement of knee flexion/extension angle using wearable UWB radios." In 2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2013. http://dx.doi.org/10.1109/embc.2013.6611222.

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Hefzy, Mohamed S., Hongzhi Yang, Eihab M. Abdel-Rahman, and Mohamad Alkhazim. "Effects of Knee Flexion Angle and Quadriceps Contraction on Hamstrings Co-Contraction." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0270.

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Abstract Open and closed kinetic chain exercises are being used as knee rehabilitation regiments. These exercises are designed to strengthen the muscles around the knee in order to improve its stability. Following a knee injury and/or surgery, the patient is asked to perform an isometric contraction of the quadriceps as the very first task of the rehabilitation process. Co-contraction of the hamstrings may occur depending on the amount of quadriceps contraction and the angle of knee flexion at which this isometric contraction is performed. The purpose of this study is to determine the effects of the knee flexion angle and the quadriceps tension on the amount of hamstrings co-contraction that occurs during an isometric contraction of the quadriceps muscles.
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Chalangari, Pouria, Thomas Fevens, and Hassan Rivaz. "3D Human Knee Flexion Angle Estimation Using Deep Convolutional Neural Networks*." In 2020 42nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC) in conjunction with the 43rd Annual Conference of the Canadian Medical and Biological Engineering Society. IEEE, 2020. http://dx.doi.org/10.1109/embc44109.2020.9176012.

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Komosa, Mark C., James E. West, Amit M. Mane, Amber N. Reeve, Chadd W. Clary, and Lorin P. Maletsky. "Analysis of Natural Knee Rollback Using Lowest Point Method." In ASME 2009 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2009. http://dx.doi.org/10.1115/sbc2009-206723.

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During knee flexion and extension the ACL and PCL help to coordinate the movement and rotation of the knee by constraining the sliding and rolling motions at the joint. In the natural knee the femur pivots about the medial condyle and the femur tends to roll back on the tibia with increasing flexion [1]. The purpose of this study was to observe if and how rollback occurs in the natural knee using the lowest point (LP) method, and to understand how anterior-posterior (AP) motion is related to flexion angle in the natural knee. A better understanding of natural knee femoral rollback will influence future design of total knee arthroplasties.
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Halloran, Jason, Craig Bennetts, Robb Colbrunn, Tara Bonner, Ahmet Erdemir, and Jack Andrish. "Evaluation of Patellofemoral Contact Mechanics as a Function of Quadriceps Load and Flexion Angle." In ASME 2012 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/sbc2012-80303.

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Patellofemoral complications are the single largest reason for knee related clinical visits. In spite of this, development of robust clinical treatments in this area remains a challenge [1]. Quantifying joint response across a wide range of conditions may lead to interventions specifically targeting desired or “normal” function. Previous patellofemoral studies often looked at joint mechanics as a function of specific quadriceps loaded flexion (e.g. deep knee bend) and/or during snapshots of loading representative of lifelike scenarios, e.g. gait, stair climb, etc. [2]. Sensitivity studies have been performed for these expected conditions [3,4] providing insight on the relationship between joint loading, geometry and potential contact mechanics. While patellofemoral biomechanics studies are prevalent, few, if any, have attempted to quantify joint response to systematic changes of two of the primary indicators of joint mechanics, namely quadriceps load and knee flexion. The overall joint response resulting from this type of approach could help quantify an envelope of natural function and also serves as an ideal data set for future computational model development. Once developed, probabilistic exploration of inherent uncertainties could be accomplished through a complimentary in vitro and in silico approach, offering quantification and classification of structure-function relationships. As a preliminary step, the goal of this study was to relate in vitro joint response, in terms of kinematics and contact mechanics, to systematic changes in knee flexion angle and quadriceps loading for a single specimen. Results from this study will offer insight into patellofemoral mechanics across a range of expected input and also serves as a starting point for future hypothesis driven studies.
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Moglo, K. E., and A. Shirazi-Adl. "Effect of Coupled Rotations on Knee Joint Ligament Forces Under Drawer Loads in Flexion." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-43241.

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A validated non-linear 3-D finite element model of human tibiofemoral joint was utilized to investigate the effect of constraint on tibial coupled internal-external and varus-valgus rotations on the passive joint response and force in ligaments under 100N drawer loads at different flexion angles. The model consisted of two bony structures and their articular cartilage layers, menisci and four principal ligaments. For the cruciate ligaments, the results showed that, in the fully unconstrained joint, ACL force decreased with flexion but remained as the primary ligament to resist the posterior femoral load throughout the range of flexion considered. A further significant decrease in ACL force with flexion angle was computed as the joint coupled rotations were constrained. As for PCL ligament, a minor contribution was at full extension under 100N anterior femoral load which further decreased as the coupled rotations were constrained. With joint flexion up to 90°, PCL force, however in contrast to ACL force, substantially increased in both constrained and unconstrained joints. Collateral ligaments, in the unconstrained joint at full extension, were the primary structures to resist the anterior femoral load but had negligible role in posterior-directed load. With joint flexion up to 90°, however, forces in collateral ligaments diminished. Similar trends were computed after fixing coupled tibial rotations with the exception of much greater LCL force and smaller MCL force at full extension under femoral anterior load and larger MCL force in flexion.
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Pineda-Lopez, Flavio, Jose Luis Rojo, Marco Flores Calero, Fernanda Aigaje Salazar, Daniel Jimenez Maldonado, Roberto Pineda Lopez, Rosario Pineda Lopez, Galo Moreno Bastidas, Andres Martinez-Fernandez, and Manuel Blanco-Velasco. "Automatic system for the analysis of flexion angle of the knee using a probabilistic model." In 2017 IEEE Second Ecuador Technical Chapters Meeting (ETCM). IEEE, 2017. http://dx.doi.org/10.1109/etcm.2017.8247517.

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