{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T11:17:38Z","timestamp":1790248658623,"version":"4.1.0"},"reference-count":35,"publisher":"Journal of Orthopaedic & Sports Physical Therapy (JOSPT)","issue":"8","content-domain":{"domain":["www.jospt.org"],"crossmark-restriction":true},"short-container-title":["Journal of Orthopaedic &amp; Sports Physical Therapy"],"published-print":{"date-parts":[[2016,8]]},"abstract":"<jats:sec><jats:title>Study Design<\/jats:title><jats:p> Cohort study, repeated measures. <\/jats:p><\/jats:sec><jats:sec><jats:title>Background<\/jats:title><jats:p> Although hamstring strength measurements are used for assessing prognosis and monitoring recovery after hamstring injury, their actual clinical relevance has not been established. Handheld dynamometry (HHD) is a commonly used method of measuring muscle strength. The reliability of HHD has not been determined in athletes with acute hamstring injuries. <\/jats:p><\/jats:sec><jats:sec><jats:title>Objectives<\/jats:title><jats:p> To determine the intertester reliability and the prognostic value of hamstring HHD strength measurement in acute hamstring injuries. <\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p> We measured knee flexion strength with HHD in 75 athletes at 2 visits, at baseline (within 5 days of hamstring injury) and follow-up (5 to 7 days after the baseline measurement). We assessed isometric hamstring strength in 15\u00b0 and 90\u00b0 of knee flexion. Reliability analysis testing was performed by 2 testers independently at the follow-up visit. We recorded the time needed to return to play (RTP) up to 6 months following baseline. <\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p> The intraclass correlation coefficients of the strength measurements in injured hamstrings were between 0.75 and 0.83. There was a statistically significant but weak correlation between the time to RTP and the strength deficit at 15\u00b0 of knee flexion measured at baseline (Spearman r = 0.25, P = .045) and at the follow-up visit (Spearman r = 0.26, P = .034). Up to 7% of the variance in time to RTP is explained by this strength deficit. None of the other strength variables were significantly correlated with time to RTP. <\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p> Hamstring strength can be reliably measured with HHD in athletes with acute hamstring injuries. The prognostic value of strength measurements is limited, as there is only a weak association between the time to RTP and hamstring strength deficit after acute injury. <\/jats:p><\/jats:sec><jats:sec><jats:title>Level of Evidence<\/jats:title><jats:p> Prognosis, level 4. J Orthop Sports Phys Ther 2016;46(8):689\u2013696. 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