{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,15]],"date-time":"2026-07-15T08:08:53Z","timestamp":1784102933383,"version":"3.55.0"},"reference-count":33,"publisher":"Journal of Orthopaedic & Sports Physical Therapy (JOSPT)","issue":"3","content-domain":{"domain":["www.jospt.org"],"crossmark-restriction":true},"short-container-title":["JOSPT Open"],"published-print":{"date-parts":[[2026,7]]},"abstract":"<jats:p>OBJECTIVE: To assess single-leg vertical hop (SLVH) symmetry in adolescent athletes with anterior cruciate ligament reconstruction (ACLR), comparing injured to uninjured limbs.<\/jats:p>\n                  <jats:p>DESIGN: Retrospective cohort study.<\/jats:p>\n                  <jats:p>METHODS: Nineteen patients (15 female; mean age=16.3 years; mean=9.2 months post-ACLR) underwent three-dimensional motion analysis during SLVH. Hop performance and biomechanics were compared between ACLR and contralateral limbs using Wilcoxon signed rank tests.<\/jats:p>\n                  <jats:p>\n                    RESULTS: Hop height was significantly lower for the ACLR limb compared with the contralateral side ( P = .028), with a median limb symmetry index (LSI) of 92.3%. Biomechanical variables demonstrated asymmetry, including peak knee and ankle flexion angles, peak knee flexion moment, total power generation, total power absorption, and percent power absorption contributed by the knee (all P \u2264 .037) even in participants who achieved hop height symmetry (LSI\n                    <jats:sub>height<\/jats:sub>\n                    \u226590%).\n                  <\/jats:p>\n                  <jats:p>CONCLUSION: Adolescent athletes in late-stage rehabilitation post-ACLR had interlimb asymmetry of biomechanics during the SLVH, indicating deficiencies of their ACLR limb and decreased readiness for return to sport. JOSPT Open 2026;4(3):321-327. 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