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Despite its apparent functional importance, there is a general lack of data regarding the time-related changes in explosive strength and the corresponding side-to-side asymmetries in individuals recovering from an ACL reconstruction (ACLR). The present study was designed to assess changes in the maximum and explosive strength of the quadriceps and hamstring muscles in athletes recovering from an ACLR.

Twenty male athletes with an ACL injury completed a standard isometric testing protocol pre-ACLR, four and six months post-ACLR. In addition to the maximum strength (F_max), the explosive strength of quadriceps and hamstrings was assessed through four variables derived from the slope of the force–time curves over various time intervals (RFD_max, RFD₅₀, RFD₁₅₀ and RFD₂₅₀). Side-to-side asymmetries were calculated relative to post-ACLR measures of the uninvolved leg …