Pes anserine bursitis

Pes anserine bursitis is an inflammatory condition of the medial (inner) knee at the anserine bursa, a sub muscular bursa, just below the pes anserinus.

Pathology

The pes anserinus is the anatomic term used to identify the insertion of the conjoined tendons Sartorius, Gracilis, and Semitendinosus into the anteromedial proximal tibia. Theoretically, bursitis results from stress to this area (e.g. stress may result when an obese individual with anatomic deformity from arthritis ascends or descends stairs). An occurrence of pes anserine bursitis commonly is characterized by pain, especially when climbing stairs, tenderness, and local swelling.^[1]

Pathophysiology

The etymology of the name relates to the insertion of the conjoined tendons into the anteromedial proximal tibia. From anterior to posterior, the pes anserinus is made up of the tendons of the sartorius, gracilis, and semitendinosus muscles. The tendon's name, which literally means "goose's foot," was inspired by the pes anserinus's webbed, footlike structure. The conjoined tendon lies superficial to the tibial insertion of the medial collateral ligament (MCL) of the knee.

Muscles involved

• Sartorius aids in knee and hip flexion, as in sitting or climbing; abducts and laterally rotates thigh; innervated by the femoral nerve.^[2]
• Gracilis adducts the hip; flexes and medially rotates tibia at knee; innervated by the obturator nerve.^[2]
• Semitendinosus flexes knee; medially rotates tibia on femur when knee is flexed; medially rotates femur when hip is extended; counteracts forward bending at hips; innervated by tibial nerve and common fibular nerve.^[2]

References

See also

• Anserine bursa
• Bursitis
• Pes anserinus

  Soft tissue disorders / Rheumatism / Connective tissue arthropathy (M65–M79, 725–728)
  Capsular joint	Synoviopathy Synovitis/Tenosynovitis Calcific tendinitis Stenosing tenosynovitis Trigger finger DeQuervain's syndrome Transient synovitis Ganglion cyst osteochondromatosis Synovial osteochondromatosis Plica syndrome villonodular synovitis Giant cell tumor of the tendon sheath Bursopathy Bursitis Olecranon Prepatellar Trochanteric Subacromial Achilles Retrocalcaneal Ischial Iliopsoas Synovial cyst Baker's cyst Calcific bursitis
  Noncapsular joint	Ligamentopathy Ligamentous laxity Hypermobility Enthesopathy/Enthesitis (and general tendinopathy) upper limb Adhesive capsulitis of shoulder Impingement syndrome Rotator cuff tear Golfer's elbow Tennis elbow lower limb Iliotibial band syndrome Patellar tendinitis Achilles tendinitis Calcaneal spur Metatarsalgia Bone spur other/general: Tendinitis Tendinosis
  Nonjoint	Fasciopathy Fasciitis: Plantar Nodular Necrotizing Eosinophilic Fibromatosis/contracture Dupuytren's contracture Plantar fibromatosis Aggressive fibromatosis Knuckle pads