The pes anserinus bursa lies between the three conjoined pes anserinus tendons and the underlying tibial collateral ligament on the medial tibia. Pes anserinus bursitis produces medial knee pain distal to the joint line that is particularly prevalent in overweight older adults and those with knee osteoarthritis. Its location is distinct from the joint line, helping to distinguish it from medial meniscal pathology.
Reduces friction between the pes anserinus tendons and the underlying medial collateral ligament during knee movement
Pes anserinus bursitis is closely associated with medial compartment knee osteoarthritis and obesity, and the two conditions commonly co-exist. The pain is reproduced by resisted internal tibial rotation and is exacerbated by climbing stairs. Local corticosteroid injection into the bursa produces short-term relief, but addressing the underlying biomechanical contributors (varus alignment, obesity, weakness) is required for durable benefit.
Medial tibial pain distal to the knee joint line from bursal inflammation, associated with knee osteoarthritis and obesity, managed with corticosteroid injection and addressing biomechanical contributors.
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