A higher number of previous hamstring injuries ( adjusted OR ( AOR ) @ ; @ % CI @ to @ ) , more degrees of active knee extension deficit after RTP ( AOR @ ; @ % CI @ to @ ) , isometric knee flexion force deficit at @ after RTP ( AOR @ ; @ % CI @ to @ ) and presence of localised discomfort on hamstring palpation after RTP ( AOR @ ; @ % CI @ to @ ) were significant independent predictors of re-injury .