The anserine bursa underlies the pes anserinus insertion on the medial tibia, reducing friction between the three conjoined tendons and the medial collateral ligament. Anserine bursitis is common in obese patients with medial knee osteoarthritis, producing medial tibial pain below the joint line that is often misattributed to the knee OA itself.
Reduces friction between the pes anserinus tendon insertion and the underlying MCL
Anserine bursitis produces medial tibial pain 2-5 cm below the joint line that is reproduced by direct palpation over the bursa and worsened by climbing stairs and rising from a chair. It can coexist with knee OA. Corticosteroid injection into the bursa (not the joint) provides reliable relief. Weight loss, quadriceps strengthening, and gait modification reduce recurrence.
Medial tibial bursal inflammation below the joint line in obese patients with OA producing a pain pattern easily confused with medial meniscal or MCL pathology, managed with targeted injection.
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