Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7236278 | Journal of Biomechanics | 2018 | 35 Pages |
Abstract
The aims of this study were to introduce and validate a novel computationally-efficient subject-specific tibiofemoral joint model. Subjects performed a quasi-static lunge while micro-dose radiation bi-planar X-rays (EOS Imaging, Paris, France) were captured at roughly 0°, 20°, 45°, 60°, and 90° of tibiofemoral flexion. Joint translations and rotations were extracted from this experimental data through 2D-to-3D bone reconstructions, using an iterative closest point optimization technique, and employed during model calibration and validation. Subject-specific moving-axis and hinge models for comparisons were constructed in the AnyBody Modeling System (AMS) from Magnetic Resonance Imaging (MRI)-extracted anatomical surfaces and compared against the experimental data. The tibiofemoral axis of the hinge model was defined between the epicondyles while the moving-axis model was defined based on two tibiofemoral flexion angles (0° and 90°) and the articulation modeled such that the tibiofemoral joint axis moved linearly between these two positions as a function of the tibiofemoral flexion. Outside this range, the joint axis was assumed to remain stationary. Overall, the secondary joint kinematics (ML: medial-lateral, AP: anterior-posterior, SI: superior-inferior, IE: internal-external, AA: adduction-abduction) were better approximated by the moving-axis model with mean differences and standard errors of (ML: â1.98â¯Â±â¯0.37â¯mm, AP: 6.50â¯Â±â¯0.82â¯mm, SI: 0.05â¯Â±â¯0.20â¯mm, IE: 0.59â¯Â±â¯0.36°, AA: 1.90â¯Â±â¯0.79°) and higher coefficients of determination (R2) for each clinical measure. While the hinge model achieved mean differences and standard errors of (ML: â0.84â¯Â±â¯0.45â¯mm, AP: 10.11â¯Â±â¯0.88â¯mm, SI: 0.66â¯Â±â¯0.62â¯mm, IE: â3.17â¯Â±â¯0.86°, AA: 11.60â¯Â±â¯1.51°).
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Authors
C.M. Dzialo, P.H. Pedersen, C.W. Simonsen, K.K. Jensen, M. de Zee, M.S. Andersen,