The arthroscope in the diagnosis of disorders of the patellofemoral joint.

Despite our current knowledge and accumulated information, orthopedic surgeons often experience difficulties in the diagnosis of internal derangement of the knee. Too often, the admission diagnosis I.D.K. means "I don't know." Disorders of the patellofemoral joint contribute to this difficulty and may simulate torn menisci and loose bodies, as well as the instability which results from rotary displacement. Patients often have difficulty describing and locating their symptoms, and 2 or more pathologic lesions may be present in the same joint. Early lesions involving the articular cartilage are especially difficult to diagnose. Even the most astute clinician cannot rely entirely on his clinical judgement, and, at times, needs the assistance of other diagnostic measures. Arthroscopy is an invaluable aid in the diagnosis of all intra-articular pathology, permitting the proper incision in the proper area, often eliminating the necessity of opening the joint and always avoiding unnecessary meniscectomy.