Patellar instability or patellar subluxation happens when your kneecap does not slide evenly in your femoral groove area.
The patella, commonly referred to as the knee cap, is comprised of three bones that join together to create what is called your knee joint.
As your knee bends and straightens back out, the patella shifts up and down a groove in the femur called the trochlea. A coating of articular cartilage on the patella and the trochlea helps to make the knee slide more smoothly.
If the patella shifts completely out of the trochlea, it is referred to as patellar dislocation. If the patella comes partially out of the trochlea, it is called patellar subluxation or patellar instability. (more…)


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