The sartorius tendon is the most anterior component of the pes anserinus, distinguishable from the gracilis (middle) and semitendinosus (posterior) by its position and by the direction of tendon fibres during the combined movement of cross-legged sitting. Its length — over 50 cm of tendon from the ASIS to the pes anserinus — reflects the extraordinary span of this, the longest muscle in the body.
Combined hip flexion-abduction-external rotation and knee flexion-internal rotation force transmission
Sartorius tendinopathy at the ASIS origin or at the pes anserinus insertion produces either anterior hip or medial knee pain depending on the site involved. ASIS avulsion in young athletes disrupts the sartorius origin (alongside the TFL), producing acute anterior hip pain at the iliac crest that is visible on radiograph as a displaced bony fragment.
Adolescent apophyseal avulsion at the sartorius origin producing acute anterior hip pain managed conservatively for displacements less than 3 cm.
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