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The popliteus muscle is a short, thin, triangular skeletal muscle in the leg. It is a major stabiliser of the knee, and is often referred to as the key to unlocking the knee. The popliteus muscle is located in the deep posterior compartment of the leg, behind the knee joint, and forms the base of the popliteal fossa. The muscle is supplied by the tibial nerve, from spinal roots L5 and S1, and receives arterial blood supply from the inferior medial and lateral genicular arteries, which are branches of the popliteal artery.
| Characteristics | Values |
|---|---|
| Location | Deep posterior compartment of the leg |
| Appearance | Short, thin, triangular |
| Function | Unlocks the knee, initiates flexion, stabilizes the knee |
| Gait Cycle | Involved in both closed and open-chain phases |
| Attachments | Lateral meniscus, fibular head, femur, tibia |
| Innervation | Tibial nerve (L4-S1), branch of the sciatic nerve |
| Blood Supply | Popliteal artery, inferior medial and lateral genicular arteries |
| Imaging | Magnetic Resonance Imaging (MRI) |
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What You'll Learn
- The popliteus muscle is a knee stabiliser
- It is located in the deep posterior compartment of the leg
- The popliteus muscle is supplied by the tibial nerve
- It is involved in both the closed and open-chain phases of the gait cycle
- The popliteus muscle may be injured with a rupture of the anterior cruciate ligament
The popliteus muscle is a knee stabiliser
The popliteus muscle is a major stabiliser of the knee joint. It is a short, thin, triangular muscle located in the deep posterior compartment of the leg, behind the knee joint. The popliteus muscle is involved in both the closed-chain and open-chain phases of the gait cycle, which are essential for walking, standing up, and sitting down.
During the closed-chain phase, when the foot is in contact with the ground, the popliteus muscle externally rotates the femur on the tibia, unlocking the knee joint and initiating flexion. This lateral rotation of the femur is what unlocks the knee, allowing for the flexion to occur. In the open-chain phase, or swing phase, when the limb is not in contact with the ground, the popliteus muscle acts to internally rotate the tibia on the femur.
The popliteus muscle originates from the lateral condyle of the femur and inserts onto the posterior surface of the tibia, just above the soleal line. It is supplied by the tibial nerve, with roots from L5 to S1, and receives arterial blood supply from branches of the popliteal artery, specifically the inferior medial and lateral genicular arteries.
The popliteus muscle is also connected to the lateral meniscus and plays a role in preventing injuries to this structure. When the knee goes into flexion, the popliteus muscle retracts the lateral meniscus posteriorly, preventing it from becoming entrapped between the femur and tibia. This is important as the lateral meniscus provides cushioning and stability to the knee joint.
In summary, the popliteus muscle is a key stabiliser of the knee, facilitating essential movements during the gait cycle and helping to protect the knee joint from injury.
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It is located in the deep posterior compartment of the leg
The popliteus muscle is located in the deep posterior compartment of the leg. It is a short, thin, triangular skeletal muscle. It is one of four compartments of the leg, with the other muscles in the deep posterior compartment including the flexor hallucis longus, tibialis posterior, flexor digitorum longus, and plantaris. The popliteus muscle is the only muscle in the posterior (back) compartment of the lower leg that acts just on the knee and not on the ankle.
The popliteus muscle is situated deep in the popliteal fossa, forming its floor. The popliteal fossa is an important anatomical area because all neurovascular structures passing from the thigh to the leg traverse this space. It is filled with tissues that offer protection to the neurovascular structure and allow movement at the knee joint. This is a diamond-shaped fossa located behind the knee. The floor of the popliteal fossa consists of the popliteal surface of the femur above, the posterior surface of the joint capsule with the overlying popliteus muscle. The superior border is made up of the bicep femoris muscle and tendon laterally, and four muscles medially: the semimembranosus, semitendinosus, gracilis, and sartorius muscles. The inferior boundaries are formed by the lateral and medial head of the gastrocnemius muscle, respectively.
The popliteus muscle is supplied by the tibial nerve, from spinal roots L5 and S1. The tibial nerve branches into anterior, medial, and lateral distributions throughout the muscle. The popliteus receives arterial blood supply mainly from branches of the popliteal artery, namely the inferior medial and lateral genicular arteries. The popliteal artery runs on the floor of the popliteal fossa between the condyles of the femur until it reaches the distal border of the popliteus muscle and terminates by dividing into the anterior tibial and tibioperoneal trunk.
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The popliteus muscle is supplied by the tibial nerve
The popliteus muscle is a small yet significant stabilising muscle of the knee. It is located in the deep posterior compartment of the leg, forming the base of the popliteal fossa, a diamond-shaped fossa located behind the knee. The popliteus muscle is the only muscle in the posterior compartment of the lower leg that acts solely on the knee joint, and not on the ankle. It is involved in both the closed-chain phase and the open-chain phase of the gait cycle.
The popliteal fossa, where the popliteus muscle is located, is an important anatomical area as all neurovascular structures passing from the thigh to the leg traverse this space. The fossa is filled with tissues that protect the neurovascular structures while allowing movement at the knee joint. The popliteal artery (PA) is located in the popliteal fossa and is a major supplier of blood to the posterior leg muscles, including the popliteus muscle.
The popliteus muscle plays a crucial role in knee stability and is often referred to as the "key" to unlocking the knee. It achieves this by laterally rotating the femur on the tibia during the closed-chain phase of the gait cycle, when the foot is in contact with the ground. During the open-chain phase, when the limb is not in contact with the ground, the popliteus muscle medially rotates the tibia on the femur. Additionally, the popliteus muscle is attached to the lateral meniscus and helps prevent it from becoming entrapped between the femur and tibia during knee flexion.
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It is involved in both the closed and open-chain phases of the gait cycle
The popliteus muscle is a small but vital muscle in the lower leg. It is a deep muscle of the knee joint, forming the floor of the popliteal fossa. It is also the only muscle in the posterior compartment of the lower leg that does not influence the ankle joint.
The popliteus muscle is involved in both the closed-chain and open-chain phases of the gait cycle. During the closed-chain phase, when the foot is in contact with the ground, the popliteus muscle externally rotates the femur on the tibia, 'unlocking' the knee joint so that flexion can occur. This allows for full extension without muscular expenditure. The popliteus is the only muscle in either the deep posterior or superficial posterior fossa to act solely on the knee joint as a posterolateral stabiliser.
In the open-chain phase, or swing phase, of the gait cycle, the popliteus muscle acts to internally rotate the tibia on the femur. This is known as the propulsion phase of gait. The popliteus is a primary internal rotator of the tibia in a non-weight-bearing position.
The popliteus muscle also assists the posterior cruciate ligament (PCL) in preventing the forward glide of the femur on the tibia. This is important for deceleration extension of the knee. The popliteus further aids in controlling the internal and external rotation of the tibia during walking and running.
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The popliteus muscle may be injured with a rupture of the anterior cruciate ligament
The popliteus muscle is a small yet major stabilising muscle of the knee. It is located in the deep posterior compartment of the leg, behind the knee joint, and forms the base of the popliteal fossa. The muscle is involved in both the closed chain phase and open-chain phase of the gait cycle. During the closed-chain phase, when the foot is in contact with the ground, the popliteus muscle externally rotates the femur on the tibia, unlocking the knee joint so that flexion can occur. In the open-chain phase, or swing phase, the muscle acts to internally rotate the tibia on the femur.
The popliteus muscle is susceptible to injuries, often in association with other injuries of the posterolateral corner of the knee, such as ligament injuries or meniscal tears. A popliteus muscle injury can be a strain or a tear, causing pain in the back of the knee. These injuries can occur suddenly due to a sudden twisting of the knee, a fall, or a collision. They can also develop gradually over time from overuse, which is more common in runners and is often related to biomechanical issues and tight hamstring muscles.
When the popliteus muscle is injured, it can be challenging to identify the specific structure of the posterolateral complex that is damaged. Magnetic resonance imaging (MRI) is the preferred diagnostic tool to evaluate the injury and detect associated issues within the knee. MRI imaging can reveal the extent, location, and type of injury, aiding in grading the injury.
In the case of a popliteus muscle injury with a rupture of the anterior cruciate ligament, treatment will depend on the nature, extent, and location of the injury, as well as the involvement of other structures in the knee. Treatment options can include conservative management, surgical repair, or a combination of both. Conservative management typically involves early weight-bearing exercises, functional rehabilitation, and the use of a long knee brace. If conservative management is unsuccessful, surgical procedures such as repair or reattachment with screws, anchors, or arthroscopic approaches may be considered.
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Frequently asked questions
The popliteus muscle is a short, thin, triangular skeletal muscle in the leg. It is a major stabiliser of the knee and is involved in both the closed chain and open-chain phases of the gait cycle.
The popliteus muscle is located in the deep posterior compartment of the leg, behind the knee joint. It forms the base of the popliteal fossa, which is a diamond-shaped fossa located behind the knee.
The popliteus muscle is often referred to as the "key" to unlocking the knee. It assists in flexing the leg upon the thigh and is essential for walking, standing up, and sitting down.
The popliteus muscle may be injured in conjunction with a rupture of the anterior cruciate ligament or injuries involving the lateral meniscus. This type of injury often occurs in sports due to a direct blow to the anteromedial aspect of the knee in a flexed position.
