A bursa around the FPL tendon in the deep forearm flexor compartment between the FPL and the anterior interosseous nerve, distinct from the wrist-level FPL radial bursa. It develops in deep forearm flexor overuse.
FPL forearm bursitis contributes to forearm pain with thumb IP flexion in pianists and typists who make repetitive fine pinch movements. The anterior interosseous nerve runs adjacent and may be compressed by bursal swelling, producing AIN palsy with inability to flex the thumb IP and index DIP. Ultrasound identifies the bursal swelling at the AIN level.
Bursal swelling around the FPL in the deep forearm producing anterior interosseous nerve compression with the typical pinch deformity — inability to flex thumb IP and index DIP against resistance.
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