The optimal criteria for return to sport following an acute hamstring injury

The optimal criteria for return to sport following an acute hamstring injury is currently unknown due to a lack of evidence-based guidelines. A number of recent studies have highlighted the potential importance of normalisation of isokinetic strength as a distinct clinical marker to facilitate the decision as to when an athlete is ready to return to sport. The aim of this study was to investigate isokinetic measurements in MRI-positive hamstring injuries. 

52 professional football players underwent isokinetic strength testing following a standardised rehabilitation program. A contralatetal deficit of more than 10% was considered abnormal. 

There was no significant difference in mean isokinetic peak torques and 10% isokinetic deficits in players without reinjury compared with reinjured players at 2 months post-initial rehabilitation. 

These results suggest that normalisation of isokinetic strength is not an essential criteria for return to sport following an acute hamstring strain in professional football players. Therefore, the possible association between isokinetic strength deficits and reinjury remains elusive. > 
From: Tol et al., Br J Sports Med (2014) (Epub ahead of print). All rights reserved to BMJ Publishing Group Ltd.