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The action of sartorius is to put the lower limbs in the seated crosslegged position of the tailor (hence its name from the Latin "sartor" meaning tailor).

The sartorius decelerates extension and medial rotation at the hip joint and extension at the knee.

Muscles with baby or satellite myofascial trigger points to consider include rectus femoris, vastus medialis, pectineus, and adductor longus, brevis, and magnus.

Pain from trigger points in this muscle is typically felt as a severe burning or sharp tingling pain or sensation.

This pain is experienced along the anterior but mostly medial aspect of the thigh and kneecap.

Typically, this is not felt as a deep knee pain, but where it is, be sure to test for chondromalacia patellae (runner’s knee).