ArticlePhysiotherapy research international : the journal for researchers and clinicians in physical therapy2026
Asymmetry in Recreational Athletes One Year After Anterior Cruciate Ligament Reconstruction: Comparison of Isokinetic Strength and Hop Test Performance.
Article in Physiotherapy research international : the journal for researchers and clinicians in physical therapy, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
background and purposeAfter anterior cruciate ligament (ACL) reconstruction, strength and performance asymmetries are widely considered relevant indicators for return to sport; however, the definition of acceptable asymmetry thresholds remains controversial. Here we compare the level of asymmetry in isokinetic knee extensor outcomes and vertical and horizontal single-leg hop tests performance one year after ACL reconstruction in recreational athletes.
methodsCross-sectional study. A total of 32 recreational athletes (females n = 13) one year after ACL reconstruction, with a mean age of 26.21 ± 7.95 years, were included. Peak torque, power, and total work were determined at 60°/s and 180°/s during isokinetic testing. Single-leg hop tests (drop jump and countermovement jump) and vertical hop test (triple hop test) were assessed.
resultsSignificant differences were observed between limbs in all tests (p < 0.05). No differences in asymmetry were found between the isokinetic and vertical hop tests, with asymmetry values ranging between 13% and 18%. The horizontal hop test showed the lowest asymmetry (4%) and exhibited significant differences compared to all other tests (p < 0.05). DISCUSSION: Our results indicate that, one year after ACL reconstruction, recreational athletes often continue to exhibit inter-limb asymmetries in isokinetic strength and jump performance that exceed the commonly accepted 10% threshold, except for the horizontal single-leg hop.
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