The proximal extent of the knee joint capsule attaches to the femur 1-2 cm above the articular cartilage margins anteriorly and posteriorly, forming the suprapatellar pouch anteriorly and the posterior capsular recesses posteriorly. The capsular reflection at the anterior femur defines the proximal boundary of the patellofemoral joint space.
Defines the proximal boundary of the knee synovial cavity and the suprapatellar pouch; its integrity maintains joint fluid within the knee.
The proximal capsular extent is disrupted in supracondylar femur fractures, causing haemarthrosis tracking into the suprapatellar pouch. In total knee arthroplasty, the proximal anterior capsule is released to allow patellar eversion. MRI evaluates the capsular integrity after high-energy knee injuries. The proximal capsule is the attachment point for the medial and lateral patellofemoral ligaments at their femoral origins.
Disruption of the superior knee capsule in supracondylar femur fractures or knee hyperextension, allowing haemarthrosis to track proximally into the thigh and producing the characteristic suprapatellar fullness.
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