{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T11:55:21Z","timestamp":1791287721951,"version":"4.1.0"},"reference-count":19,"publisher":"BMJ","issue":"18","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["Br J Sports Med"],"accepted":{"date-parts":[[2014,1,3]]},"published-print":{"date-parts":[[2014,9]]},"abstract":"<jats:sec>\n                  <jats:title>Background<\/jats:title>\n                  <jats:p>There is an ongoing debate regarding the optimal criteria for return to sport after an acute hamstring injury. Less than 10% isokinetic strength deficit is generally recommended but this has never been documented in professional football players after rehabilitation. Our aim was to evaluate isokinetic measurements in MRI-positive hamstring injuries.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Methods<\/jats:title>\n                  <jats:p>Isokinetic measurements of professional football players were obtained after completing a standardised rehabilitation programme. An isokinetic strength deficit of more than 10% compared with the contralateral site was considered abnormal. Reinjuries within 2\u2005months were recorded.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Results<\/jats:title>\n                  <jats:p>52 players had a complete set of isokinetic testing before clinical discharge. There were 27 (52%) grade 1 and 25 (48%) grade 2 injuries. 35 of 52 players (67%) had at least one of the three hamstring-related isokinetic parameters that display a deficit of more than 10%. The percentage of players with 10% deficit for hamstring concentric 60\u00b0\/s, 300\u00b0\/s and hamstring eccentric was respectively 39%, 29% and 28%. There was no significant difference of mean isokinetic peak torques and 10% isokinetic deficits in players without reinjury (N=46) compared with players with reinjury (N=6).<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Conclusions<\/jats:title>\n                  <jats:p>When compared with the uninjured leg, 67% of the clinically recovered hamstring injuries showed at least one hamstring isokinetic testing deficit of more than 10%. Normalisation of isokinetic strength seems not to be a necessary result of the successful completion of a football-specific rehabilitation programme. The possible association between isokinetic strength deficit and increased reinjury risk remains unknown.<\/jats:p>\n               <\/jats:sec>","DOI":"10.1136\/bjsports-2013-093016","type":"journal-article","created":{"date-parts":[[2014,2,4]],"date-time":"2014-02-04T01:28:15Z","timestamp":1391477295000},"page":"1364-1369","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":117,"title":["At return to play following hamstring injury the majority of professional football players have residual isokinetic deficits"],"prefix":"10.1136","volume":"48","clinical-trial-number":[{"clinical-trial-number":"nct01812564","registry":"10.18810\/clinical-trials-gov"}],"author":[{"given":"Johannes L","family":"Tol","sequence":"first","affiliation":[{"name":"Aspetar, Qatar Orthopaedic and Sports Medicine Hospital, Doha, Qatar"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bruce","family":"Hamilton","sequence":"additional","affiliation":[{"name":"High Performance Sport New Zealand\/NZ Olympic Committee, Sports Research Institute New Zealand (SPRINZ), Auckland, New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cristiano","family":"Eirale","sequence":"additional","affiliation":[{"name":"Aspetar, Qatar Orthopaedic and Sports Medicine Hospital, Doha, Qatar"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Patrice","family":"Muxart","sequence":"additional","affiliation":[{"name":"Aspetar, Qatar Orthopaedic and Sports Medicine Hospital, Doha, Qatar"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Philipp","family":"Jacobsen","sequence":"additional","affiliation":[{"name":"Aspetar, Qatar Orthopaedic and Sports Medicine Hospital, Doha, Qatar"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rod","family":"Whiteley","sequence":"additional","affiliation":[{"name":"Aspetar, Qatar Orthopaedic and Sports Medicine Hospital, Doha, 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