A small bursa at the third carpometacarpal joint between the capitate and the base of the middle finger metacarpal, the central fixed unit of the wrist. The third CMC joint bears the highest compressive loads of the CMC joints.
Third CMC joint arthritis is the second most common CMC arthritis after the thumb base. Carpal boss occurs most frequently at the second and third CMC joints. Targeted third CMC joint injection under fluoroscopy or ultrasound is indicated for isolated joint arthritis confirmed by provocative palpation.
Degenerative arthritis at the capitate-third metacarpal base producing central dorsal wrist pain and tenderness, managed with splinting and joint injection or arthrodesis for refractory cases.
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