Popliteus

Popliteus is a small muscle located at the back of the knee. It is triangular in shape and is often referred to as the "key" that unlocks the knee from a fully extended position. The popliteus muscle plays a crucial role in walking, running, and other activities that involve bending the knee.

Anatomy[edit | edit source]

The popliteus muscle originates from the lateral condyle of the femur, which is the bony prominence on the outer side of the thigh bone. It then runs diagonally across the back of the knee and inserts into the posterior surface of the tibia, the larger of the two bones in the lower leg.

The popliteus muscle is innervated by the tibial nerve, a branch of the sciatic nerve. It receives its blood supply from the popliteal artery, which is a continuation of the femoral artery.

Function[edit | edit source]

The primary function of the popliteus muscle is to "unlock" the knee by laterally rotating the femur on the tibia when the leg is flexed. This action allows the knee to bend after it has been fully extended or locked. The popliteus muscle also helps to stabilize the knee during walking and running.

Clinical significance[edit | edit source]

Injury to the popliteus muscle or its tendon can cause pain and swelling at the back of the knee. This can occur as a result of direct trauma, overuse, or due to conditions such as popliteus tendinitis or popliteus syndrome. Treatment typically involves rest, physical therapy, and in some cases, surgery.

Popliteus Resources
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