ArticleJournal of orthopaedic surgery and research2021
Validation of a portable marker-based motion analysis system.
Article in Journal of orthopaedic surgery and research, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 14 papers.
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14 citing papers in PubMed, 17 citations in OpenAlex.
- Effect of Q-angle symmetry on knee joint kinematics in level walking, upslope walking and landing task.Journal of orthopaedic surgery and research · 2026Article
- Comparison of Knee Function After Reconstruction With Posterolateral Corner Injury and With or Without Posteromedial Corner Injury for Treating Knee Dislocation Cases: A Prospective Cohort Study.Orthopaedic surgery · 2026Article
- Markerless 3D motion capture in return to sport decision making for ACL injured high level athletes: a narrative review with proposed clinical implementation pathway.Annals of joint · 2026Review
- Proximal-dominant knee-ankle coordination compensations in football players with chronic ankle instability under high load.Journal of experimental orthopaedics · 2025Article
- Quantification of 3D Kinematic Measurements for Knee Flexion and Tibial Rotation Using an IMU-Based Sensor and Ultrasound Imaging System: A Cadaveric Study.Sensors (Basel, Switzerland) · 2025Article
- DeepLabCut custom-trained model and the refinement function for gait analysis.Scientific reports · 2025Article
- The evolution of three-dimensional knee kinematics after ACL reconstruction within one year.Frontiers in bioengineering and biotechnology · 2025Article
- A dynamic knee function scoring system for anterior cruciate ligament injuries based on normative six-degree-of-freedom gait pattern.BMC musculoskeletal disorders · 2024Article
- Obesity-Specific Considerations for Assessing Gait with Inertial Measurement Unit-Based vs. Optokinetic Motion Capture.Sensors (Basel, Switzerland) · 2024Article
- Kinematic effects of unilateral TKA on the contralateral knee in Chinese patients with advanced osteoarthritis: a prospective gait analysis study.Frontiers in bioengineering and biotechnology · 2024Article
- Significant differences in knee kinematics of healthy subjects with high and low anterior tibial laxity.Frontiers in bioengineering and biotechnology · 2024Article
- Article
- The Chinese knotting technique assist anatomical anterior cruciate ligament reconstruction for aggressive rehabilitation.Medicine · 2022Article
- Recent Trends and Practices Toward Assessment and Rehabilitation of Neurodegenerative Disorders: Insights From Human Gait.Frontiers in neuroscience · 2022Review
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Authors and funding
7 authors at 5 institutions in 1 country.
Funding
Abstract
backgroundThe Opti_Knee system, a marker-based motion capture system, tracks and analyzes the 6 degrees of freedom (6DOF) motion of the knee joint. However, the validation of the accuracy of this gait system had not been previously reported. The objective of this study was to validate and the system. Two healthy subjects were recruited for the study.
methodsThe 6DOF kinematics of the knee during flexion-extension and level walking cycles of the knee were recorded by Opti_Knee and compared to those from a biplanar fluoroscopy system. The root mean square error (RMSE) of knee kinematics in flexion-extension cycles were compared between the two systems to validate the accuracy at which they detect basic knee motions. The RMSE of kinematics at key events of gait cycles (level walking) were compared to validate the accuracy at which the systems detect functional knee motion. Pearson correlation tests were conducted to assess similarities in knee kinematic trends between the two systems.
resultsIn flexion-extension cycles, the average translational accuracy (RMSE) was between 2.7 and 3.7 mm and the average rotational accuracy was between 1.7 and 3.8°. The Pearson correlation of coefficients for flexion-extension cycles was between 0.858 and 0.994 for translation and 0.995-0.999 for angles. In gait cycles, the RMSEs of angular knee kinematics were 2.3° for adduction/abduction, 3.2° for internal/external rotation, and 1.4° for flexion/extension. The RMSEs of translational kinematics were 4.2 mm for anterior/posterior translation, 3.3 mm for distal/proximal translation, and 3.2 mm for medial/lateral translation. The Pearson correlation of coefficients values was between 0.964 and 0.999 for angular kinematics and 0.883 and 0.938 for translational kinematics.
conclusionThe Opti_Knee gait system exhibited acceptable accuracy and strong correlation strength compared to biplanar fluoroscopy. The Opti _Knee may serve as a promising portable clinical system for dynamic functional assessments of the knee.
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