The pes anserinus is the conjoined insertion of the sartorius, gracilis, and semitendinosus tendons on the anteromedial tibia, arranged in a goose-foot pattern (from which it derives its name). A bursa lies between the pes and the MCL.
The combined pes anserinus tendons provide dynamic medial knee stabilisation, assist MCL in resisting valgus stress, contribute to internal tibial rotation control, and are the donor site for hamstring ACL grafts.
Pes anserinus bursitis produces anteromedial knee pain below the joint line in overweight, osteoarthritic, or diabetic patients. It is commonly confused with medial compartment arthritis. The semitendinosus and gracilis tendons are harvested through a pes anserinus incision for hamstring ACL reconstruction.
Bursa inflammation between the pes tendons and the MCL producing anteromedial knee pain below the joint line in obese or diabetic patients with osteoarthritis, treated by aspiration and corticosteroid injection.
Semitendinosus and gracilis tendons harvested through the pes anserinus insertion using a tendon stripper for quadrupled hamstring ACL reconstruction graft.
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