In the past, rehabilitation after ACL reconstruction involved long periods of continuous immobilization of the knee in a position of flexion and an extended period (often 6 to 8 weeks) of restricted weight-bearing. Return to full activity often took a full year. What kind of precautions must be taken after ACL Reconstruction is discussed here which are, Resistance Training—General Precautions Progress exercises more gradually for reconstruction with hamstring tendon graft than bone-patellar tendon-bone graft. Progress knee flexor strengthening exercises cautiously if a hamstring tendon graft was harvested and knee extensor strengthening if a patellar tendon graft was harvested. Closed-Chain Training When squatting in an upright position, be sure that the knees do not move anterior to the toes as the hips descend because this increases shear forces on the tibia and could potentially place excess stress on the autograft. Avoid closed-chain strengthening of the q...