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Patellofemoral Arthritis

Patellofemoral Arthritis

OVERVIEW

Patellofemoral arthritis affects your kneecap (patella bone). It causes pain in the front of your knee and can make it difficult to kneel and climb stairs.

ANATOMY

The patella is a small bone located in front of your knee joint — where the thighbone (femur) and shinbone (tibia) meet. It protects your knee and connects the muscles in the front of your thigh to your tibia.

The patella rests in a groove on top of the femur called the trochlear groove. When you bend and straighten your knee, the patella moves back and forth inside the groove.

The ends of the femur, trochlear groove, and the undersides of the patella are covered with a slippery substance called articular cartilage. This helps the bones glide smoothly along each other as you move your leg.

(Left) The patella normally rests in a small groove at the end of the femur called the trochlear groove. (Right) As you bend and straighten your knee, the patella slides up and down within the groove.

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