|The suprapatellar pouch or bursa above the patella. The thin fold in the illustration represents the suprapatellar plica, which sometimes is more of a membrane stretching right across the pouch.|
Movement and the suprapatellar pouch
The inner lining of the pouch secretes synovial fluid, which is a lubricant, and this lubricated pouch allows the slack that permits all the structures of the knee to accommodate when the knee is bent and straightened. If the walls of the pouch become stuck down with adhesions then movement of the knee becomes limited and painful.
Intraarticular arthrofibrosis of the knee alters patellofemoral contact biomechanics. Mikula JD, Slette EL, Dahl KD, Montgomery SR, Dornan GJ, O’Brien L, Turnbull TL and Hackett TR. J Exp Orthop. 2017 Dec; 4: 40.