The subcutaneous infrapatellar bursa lies between the skin of the knee and the patellar ligament. The knee, like other freely movable joints, has closed, fluid-filled sacs called bursae associated with it. Each bursa has an inner lining of synovial membrane, which may be continuous with the synovial membrane of a nearby joint cavity. Bursae act as cushions and aid the movement of tendons that glidemycontentbreak over such bony parts or over other tendons. The names of the bursae indicate their locations; for example, a suprapatellar bursa, a prepatellar bursa, and a infrapatellar bursa.