Hamstring injury in futsal players: the effect of active range of motion (AROM) deficit on the full recovery time
Abstract Background Hamstring muscle injuries are one of the most common traumas occurring in athletes and football players. Thus, the recovery time is crucial for their return to full athlete activity. Objective This article examines cases of hamstring injury in futsal players and finds association between the active range of motion (AROM) deficit and the full recovery time. Methods For this study, 200 futsal players with acute, first-time, unilateral posterior hamstring injuries were recruited, all men. All patients underwent clinical examination and ultrasonography. In 74 of 200 patients, sonography revealed no abnormalities in the musculoligamentary structures. Thereby, they were excluded from further investigation. Only 126 futsal players underwent measurement of the active range of motion with a 30-cm clear plastic inclinometer. Injured areas were compared with the normal hamstrings in all athletes and with the control group, and the AROM deficit was evaluated. The association between the full recovery time and the AROM deficit was identified. A control group (100 men) underwent examination in the same series of steps as the study group. Results Biceps femoris was the most commonly injured muscle, making up 80% of injuries. The musculotendinous junction, proximal and distal, was involved in 91% of injury cases. Twelve athletes had an AROM deficit of 25 to 35 degrees and reached full recovery at 2.5 months and later. Seventy or 55.5% of athletes had an AROM deficit less than 15 degrees and felt fully recovered only in a month. Conclusions The classification system of hamstring muscle injuries that is offered here is based on an objective clinical marker (active knee ROM deficit), is easily applicable, and is indicative of recovery duration.