A bursa around the extensor indicis proprius tendon within the fourth extensor compartment at the wrist level, reducing friction as the EIP tendon slides beneath the extensor retinaculum alongside the EDC tendons.
EIP wrist bursitis causes dorsal wrist pain with independent index finger extension. It is part of the fourth extensor compartment tenosynovitis syndrome seen in inflammatory arthropathy. Ultrasound identifies fluid around the EIP tendon at the retinaculum level. Fourth compartment decompression addresses both EIP and EDC tendon sheath pathology.
Bursal inflammation around the EIP tendon at the wrist producing dorsal wrist pain with index finger extension, a feature of inflammatory tenosynovitis managed with injection and compartment release.
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