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Relationship of Knee Forces to Subjective Function Pre- and Post-ACL Reconstruction

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PURPOSE: Although basic objective measures (e.g., knee laxity, strength, and hop tests) have been related to subjective measures of function, associations between knee-specific objective and subjective measures have yet to be completed. The objective was to determine if knee joint contact and ligament forces differ between pre- and post-anterior cruciate ligament (ACL) reconstructed states and if these forces relate to their patient's respective subjective functional ability scores.

METHODS: Twelve patients performed a hopping task before and after reconstruction. Magnetic resonance images and OpenSim were used to develop patient-specific models in static optimization and joint reaction analyses. Questionnaires concerning each patient's subjective functional ability were also collected and correlated with knee joint contact and ligament forces.

RESULTS: No significant differences were observed between deficient and reconstructed groups with respect to knee joint contact or ligament forces. Nevertheless, there were several significant (P < 0.05) moderate to strong correlations between subjective and objective measures including Tegner activity level to contact force in both states (r = 0.67-0.76) and International Knee Documentation Committee to compressive and anterior shear forces (r = 0.64-0.66).

CONCLUSION: Knee-specific objective measures of a patient's functional capacity can represent their subjective ability, which explains this relationship to a greater extent than past anatomical and gross objective measures of function. This consolidation is imperative for improving the current rehabilitation schema as it allows for external validation of objective and subjective functional measures. With poor validation of subjective function against objective measures of function, the reinjury rate is unlikely to diminish, continuing the heavy financial burden on health care systems.

Original languageEnglish
JournalMedicine and Science in Sports and Exercise
Volume52
Issue number6
Pages (from-to)1338-1346
Number of pages9
ISSN0195-9131
DOIs
Publication statusPublished - Jun 2020

    Research areas

  • Adult, Anterior Cruciate Ligament Injuries/physiopathology, Anterior Cruciate Ligament Reconstruction/psychology, Biomechanical Phenomena, Computer Simulation, Exercise Test, Female, Humans, Knee Joint/diagnostic imaging, Ligaments, Articular/diagnostic imaging, Lysholm Knee Score, Magnetic Resonance Imaging, Male, Patient Outcome Assessment, Patient Reported Outcome Measures, Physical Functional Performance, Time and Motion Studies, Young Adult

ID: 62407761