Quadriceps weakness after anterior cruciate ligament (ACL) reconstruction is associated with poor self-reported knee function, but loading the quadriceps is difficult in the early phase after ACL surgery. 

Cross-education, which is the increase in muscle strength on one side after training the homologous muscles on the opposite side, could minimise the strength loss after ACL surgery.  

We found that cross-education training with the non-injured leg, as adjuvant to standard care, did not accelerate the ACL recovery of the operated leg.