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Tibialis Posterior Origin Bursa

bursa originis tibialis posterioris

A small, inconstant bursa at the posterior interosseous origin of tibialis posterior, between the muscle and the posterior interosseous membrane. It reduces friction during tibialis posterior contraction against the interosseous membrane.

Region: Lower Leg

Clinical Relevance

Clinical Notes

Rarely symptomatic in isolation but contributes to deep posterior compartment pain in runners and triathletes. It may become inflamed in tibialis posterior dysfunction. Deep posterior compartment pressure measurement distinguishes compartment syndrome from bursitis.

Pathology

Common Injuries & Conditions

Deep Posterior Compartment Bursitis

Inflammation at the tibialis posterior origin presenting as deep medial lower leg pain with resisted plantarflexion and inversion, mimicking chronic exertional compartment syndrome.