The effect of preoperative quadriceps strength on strength and function after anterior cruciate ligament reconstruction.

Strength deficits of the musculature surrounding the knee can be significant after anterior cruciate ligament reconstruction (ACLr). In patients who have undergone ACLr, regaining quadriceps function is a core focus of therapeutic rehabilitation. Knee stability, which is dependent on neuromuscular control, including quadriceps strength, is necessary for normal coordination of the lower extremity.1,2 After ACL rupture, the quadriceps muscle group tends to weaken, presenting a rehabilitation challenge to those waiting for surgery by further decreasing joint stability.2 Preoperative rehabilitation to restore quadriceps strength and function has been recommended,3,4 but there is a paucity of evidence to demonstrate its effectiveness. The relationship between preoperative quadriceps strength and postoperative strength and function must be understood to determine whether preoperative strengthening will be beneficial to postsurgical outcomes by minimizing deficits and increasing stability after surgery.