Common sites pre-patellar bursa olecranon bursa subacromial bursa. Most commonly injured knee ligament. Frequently overlooked because of benign early appearance. This injury involves death of an osteochondral fragment with partial or complete separation of from its bed. Prognosis related to age.
Open epiphyses increase the chances for healing.
Exam apprehension on posterior drawer testing. X-rays are usually not helpful. Physical exam compatible with impingement syndrome except for excessive laxity always suspect in young athlete with findings of bursitis. Tenderness is superficial and usually associated with difficulty contracting the injured muscle tissue. Tenderness is not diminished with active arm elevation.