Twenty-three patients, between the ages of 18 and 45, with an isolated ACL tear were randomly assigned into one of two groups to test the effect of a 6-week prehabilitation (exercise) program on functional outcomes. Patients received either a 6 weeks of prehabilitation before surgery or no prehabilitation at all. Results indicated that while quadriceps and hamstring peak torque were comparable between the groups following treatment, patients who received the prehabilitation program were more likely to experience an improvement in knee function (assessed through the single-legged hop test and Modified Cincinnati score) 12 weeks after surgery.