The sartorius tendon is the most anterior and superficial component of the pes anserinus, inserting on the medial tibia in front of the gracilis and semitendinosus. Its distal tendon is broad and thin, fanning out into an aponeurosis (the sartorial fascia) that blends with the deep fascia of the leg. Sartorius is the longest muscle in the body, running about 50 cm from the anterior superior iliac spine to the medial tibia.
| Muscle | |
|---|---|
| Attachment | Medial tibial surface at the pes anserinus, the most anterior and superior of the three pes tendons |
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, producing acute anterior hip pain with a displaced bony fragment visible on radiograph. At the knee, the sartorial fascia must be opened to reach the gracilis and semitendinosus during hamstring graft harvest. Pes anserinus bursitis beneath the three tendons causes medial tibial pain below the joint line, distinguishing it from MCL and meniscal pain.
Adolescent apophyseal avulsion at the sartorius origin producing acute anterior hip pain managed conservatively for displacements less than 3 cm.
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