The deep infrapatellar bursa lies between the patellar ligament and the top of the tibia, shielding the ligament in its movement over the tibia. The knee, like other freely movable joints, has several 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 actmycontentbreak as cushions and aid the movement of tendons that glide 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.