Quadriceps strength influences patient function more than single leg forward hop during late-stage ACL rehabilitation

Review written by Dr Jarred Boyd info

Key Points

  1. Isolated quadriceps capacity, as indicated by limb symmetry index (LSI) and peak torque, appear to demonstrate a larger association with International Knee Documentation Committee (IKDC) scores as opposed to single leg hop symmetry and performance.
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The high recurrence of anterior cruciate ligament (ACL) tears and low rates of returning to prior level of sporting performance continues to be a pervasive issue plaguing the rehabilitation world (1).

The implementation of both subjective and objective measures may provide critical information on functional restoration and further investigation into potential causal factors for the observed outcomes. Without establishing relationships, the outcomes for ACL reconstruction (ACLR) may continue to be hampered as deficits in specific capacities and competencies are left undetected by compensatory kinematic solutions, kinetic redistribution and psychological constrains (2).

The primary aim of this study was to investigate the relationship between quadriceps strength and single leg forward hop, symmetry and unilateral performance, with an athlete’s subjective report of function as indicated by the International Knee Documentation Committee Subjective Knee Form (IKDC). Exploring the performance tests that posed the most significant challenge was also examined.

The high recurrence of ACL tears and low rates of returning to prior level of sporting performance continues to be a pervasive issue.
It may be prudent to allocate concerted attention on isolated restoration of quadriceps strength.


This study was a cross-sectional design, i.e. data was obtained from a specific population at a distinct point in time, in this case during late-stage ACLR rehabilitation. Participants consisted of 48 physically active 14-25 year old ACLR patients who were

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