Functional sports testing may also be indicated in some patients who have had a previous surgery and otherwise seem to have normal knee stability and other problems. In this circumstance, it is important to determine whether the patient needs more directed physical therapy by working on their balance, improving their flexibility, increasing their overall strength, or increasing their endurance. A functional sports test may provide excellent guidance to a patient who wishes to increase their overall activities, and to determine if they have achieved sufficient return of function after surgery to return to full activities.