Application of tibiofemoral compression force (TCF) has been shown to produce anterior cruciate ligament (ACL) injuries in a laboratory setting. A new robotic testing methodology was utilized to predict ACL forces generated by TCF without directly loading the ligament. We hypothesized that ACL force, directly recorded by a miniature load cell during an unconstrained test, could be predicted by measurements of anterior tibial restraining force (ARF) recorded during a constrained test. The knee was first flexed under load control with 25 N TCF (tibial displacements and rotations unconstrained) to record a baseline kinematic pathway. Tests were repeated with increasing levels of TCF, while recording ACL force and knee kinematics. Then tests with increasing TCF were performed under displacement control to reproduce the baseline kinematic pathway (tibia constrained), while recording ARF. This allowed testing to 1500 N TCF since the ACL was not loaded. TCF generated ACL force for all knees (n = 10) at 50 deg flexion, and for eight knees at 30 deg flexion (unconstrained test). ACL force (unconstrained test) and ARF (constrained test) had strong linear correlations with TCF at both flexion angles (R2 from 0.85 to 0.99), and ACL force was strongly correlated with ARF at both flexion angles (R2 from 0.76 to 0.99). Under 500 N TCF, the mean error between ACL force prediction from ARF regression and measured ACL force was 4.8±7.3 N at 30 deg and 8.8±27.5 N at 50 deg flexion. Our hypothesis was confirmed for TCF levels up to 500 N, and ARF had a strong linear correlation with TCF up to 1500 N TCF.
Issue Section:
Technical Brief
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