Semimembranosus Tendinopathy: Difference between revisions
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= <br>Clinically Relevant Anatomy = | = <br>Clinically Relevant Anatomy = | ||
The origin of the semimembranosus muscle is located at the lateral aspect of the ischial tuberosity, the muscle runs down the posteromedial aspect of the thigh and inserts at the posteromedial aspect of the knee. The muscle belly ends just above the knee joint and forms a thick rounded tendon distally, which passes medial to the medial head of the gastrocnemius but lateral to the smaller semitendinosus tendon. [1] | |||
The most important function of the semimembranosus muscle is flexion and internal rotation of the knee joint. It also stabilizes the pelvis and causes extension of the hip joint.<br>There is a U-shaped bursa that surrounds the distal SM tendon, separating the distal aspects of the tendon from the medial tibial plateau, MCL, and semitendinosus. Friction and repetitive eccentric tendon loading can lead to degenerative changes in the tendon and its insertions and irritation of the bursa. [2][3] | |||
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= <br>Mechanism of Injury / Pathological Process <br> = | = <br>Mechanism of Injury / Pathological Process <br> = | ||
Revision as of 22:02, 16 May 2016
Description[edit | edit source]
Semimembranosus tendinopathy (SMT) is an uncommon cause of chronic knee pain that is rarely described in the medical literature and may be underdiagnosed or inadequately treated owing to a lack of understanding of the condition. [6]
The tendon of the muscles that form the pes anserinus (m. Sartorius, m. Gracilis, m. Semitendinosis) run on the medial side of the knee and insert on the medial side of the tibial plateau just below the tuberosity of the tibia. There is a bursa under the tendon to smooth the movement of the tendons. It is often the bursa that will be ignited by excessive friction. The semimembranosispees is slightly deeper in the knee cavity and can also get overloaded with excessive hamstring activity. [7]
The incidence of Semimembranosus Tendinopathy is unknown in the athletic population and is probably more common by older patients. The usual presentation for SMT is pain on the posteromedial side of the knee. Physical examination can usually localize the area of tenderness to the distal semimembranosus tendon or its insertion on the medial proximal tibia. [8]
Clinically Relevant Anatomy[edit | edit source]
The origin of the semimembranosus muscle is located at the lateral aspect of the ischial tuberosity, the muscle runs down the posteromedial aspect of the thigh and inserts at the posteromedial aspect of the knee. The muscle belly ends just above the knee joint and forms a thick rounded tendon distally, which passes medial to the medial head of the gastrocnemius but lateral to the smaller semitendinosus tendon. [1]
The most important function of the semimembranosus muscle is flexion and internal rotation of the knee joint. It also stabilizes the pelvis and causes extension of the hip joint.
There is a U-shaped bursa that surrounds the distal SM tendon, separating the distal aspects of the tendon from the medial tibial plateau, MCL, and semitendinosus. Friction and repetitive eccentric tendon loading can lead to degenerative changes in the tendon and its insertions and irritation of the bursa. [2][3]
