{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,29]],"date-time":"2026-10-29T23:27:43Z","timestamp":1793316463787,"version":"4.5.0"},"reference-count":41,"publisher":"BMJ","issue":"2","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Br J Sports Med"],"accepted":{"date-parts":[[2011,10,20]]},"published-print":{"date-parts":[[2012,2]]},"abstract":"<jats:sec><jats:title>Background<\/jats:title><jats:p>Hamstring injury is the single most common injury in professional football. MRI is commonly used to confirm the diagnosis and provide a prognosis of lay-off time.<\/jats:p><\/jats:sec><jats:sec><jats:title>Objective<\/jats:title><jats:p>To evaluate the use of MRI as a prognostic tool for lay-off after hamstring injuries in professional football players and to study the association between MRI findings and injury circumstances.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Prospective cohort study where 23 European professional teams, were followed between 2007 and 2011. Team medical staffs recorded individual player exposure and time-loss injuries. Radiological grading was performed using a modified Peetrons classification into four grades where grades 2 and 3 represent fibre disruption.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>In total, 516 hamstring injuries occurred and 58% of these were examined by MRI. Thirteen per cent were grade 0 injuries, 57% grade 1, 27% of grade 2 and 3% of grade 3. Grade 0 and 1 injuries accounted for 56% (2141\/3830 days) of the total lay-off. The lay-off time differed between all four radiological grades of injury (8\u00b13, 17\u00b110, 22\u00b111 and 73\u00b160 days, p&lt;0.0001). Eighty-three per cent of injuries affected the biceps femoris while 11% and 5% occurred to the semimembranosus and semitendinosus, respectively. Re-injuries (N=34\/207) constituted 16% of injuries. All re-injuries occurred to the biceps femoris.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>MRI can be helpful in verifying the diagnosis of a hamstring injury and to prognosticate lay-off time. Radiological grading is associated with lay-off times after injury. Seventy per cent of hamstring injuries seen in professional football are of radiological grade 0 or 1, meaning no signs of fibre disruption on MRI, but still cause the majority of absence days.<\/jats:p><\/jats:sec>","DOI":"10.1136\/bjsports-2011-090155","type":"journal-article","created":{"date-parts":[[2011,12,6]],"date-time":"2011-12-06T05:45:51Z","timestamp":1323150351000},"page":"112-117","source":"Crossref","is-referenced-by-count":422,"title":["Hamstring muscle injuries in professional football: the correlation of MRI findings with return to play"],"prefix":"10.1136","volume":"46","author":[{"given":"Jan","family":"Ekstrand","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jeremiah C","family":"Healy","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Markus","family":"Wald\u00e9n","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Justin C","family":"Lee","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bryan","family":"English","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Martin","family":"H\u00e4gglund","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2011,12,5]]},"reference":[{"key":"2024051401413686000_46.2.112.1","doi-asserted-by":"crossref","first-page":"40","DOI":"10.1111\/j.1600-0838.1996.tb00069.x","article-title":"Soccer injuries in Iceland","volume":"6","author":"\u00c1rnason","year":"1996","journal-title":"Scand J Med Sci Sports"},{"key":"2024051401413686000_46.2.112.2","doi-asserted-by":"publisher","DOI":"10.1249\/00005768-198315030-00014"},{"key":"2024051401413686000_46.2.112.3","doi-asserted-by":"publisher","DOI":"10.1136\/bjsm.2009.060582"},{"key":"2024051401413686000_46.2.112.4","doi-asserted-by":"publisher","DOI":"10.1177\/0363546510395879"},{"key":"2024051401413686000_46.2.112.5","doi-asserted-by":"publisher","DOI":"10.1136\/bjsm.2006.027623"},{"key":"2024051401413686000_46.2.112.6","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-0838.2004.00395.x"},{"key":"2024051401413686000_46.2.112.7","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-0838.2008.00861.x"},{"key":"2024051401413686000_46.2.112.8","doi-asserted-by":"publisher","DOI":"10.2165\/00007256-199418010-00006"},{"key":"2024051401413686000_46.2.112.9","doi-asserted-by":"publisher","DOI":"10.1177\/0363546503261245"},{"key":"2024051401413686000_46.2.112.10","doi-asserted-by":"crossref","unstructured":"M\u00fcller-Wohlfahrt H Ueblacker P H\u00e4nsel L . 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