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Patellar subluxation syndrome is an injury involving the kneecap. Patellar subluxation is more common than patellar dislocation and is just as disabling. [1] In this condition, the patella repetitively subluxates and places strain on the medial restraints and excessive stress/tension on the patellofemoral joint. Patellar subluxation can be ...
The patellofemoral glide, tilt, and grind tests (Clarke's sign), when performed, can provide strong evidence for PFPS. [3] [19] Lastly, lateral instability can be assessed via the patellar apprehension test, which is deemed positive when there is pain or discomfort associated with lateral translation of the patella.
A tangent to the lateral facet of the patella. With the knee in 20° flexed, this angle should normally open laterally. [16] The patellofemoral index is the ratio between the thickness of the medial joint space and the lateral joint space (L). With the knee 20° flexed, it should measure 1.6 or less. [16]
A lateral release is a surgical procedure to release tight capsular structures (lateral retinaculum) on the outer aspect (lateral aspect) of the kneecap ().This is usually performed because of knee pain related to the kneecap being pulled over to the outer (lateral) side and not being able to run properly in the centre of the groove of the femur bone as the knee bends and straightens.
The knee is generally divided into three "compartments": medial, lateral, and patellofemoral. Most people with arthritis severe enough to consider knee replacement have significant wear in two or more of the above compartments, and are treated with total knee replacement (TKA).
A knee dislocation is an injury in which there is disruption of the knee joint between the tibia and the femur. [3] [4] Symptoms include pain and instability of the knee. [2] Complications may include injury to an artery, most commonly the popliteal artery behind the knee, or compartment syndrome. [3] [4] [7]
The most likely time for the patella to shift laterally is during the first 20–30 degrees of flexion as the quadriceps tighten simultaneously and pull the patella laterally. Beyond 30 degrees, the quadriceps tendon and patellar ligament pull the patella posterior into the groove of the knee joint making lateral dislocation of the patella ...
The bones that make up the knee are the femur, patella, tibia, and fibula. In the posterolateral corner, the bony landmarks of the tibia, fibula and femur serve as the attachment sites of the ligaments and tendons that stabilize this portion of the knee. The patella plays no significant role in the posterolateral corner.