A small bursa at the medial ankle where the tibionavicular band of the deltoid ligament approaches the navicular, reducing friction between this deep ligament and the overlying tibialis posterior tendon sheath as the foot pronates and supinates.
Tibionavicular region bursitis presents as medial ankle and proximal foot pain distinct from both tibialis posterior tendinopathy and deltoid ligament sprain. Ultrasound identifies the bursal fluid between the deep deltoid and the posterior tibial tendon sheath. It is an uncommon cause of medial ankle pain that responds to targeted injection and orthotics addressing pronation.
Bursal inflammation at the medial ankle between the tibionavicular deltoid band and tibialis posterior tendon sheath, producing medial ankle pain with pronation, managed with orthotics and injection.
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