Stenosing tenosynovitis

Stenosing tenosynovitis (also known as trigger finger or trigger thumb) is a painful condition caused by the inflammation (tenosynovitis) and progressive restriction of the superficial and deep flexors fibrous tendon sheath adjacent to the A1 pulley at a metacarpal head. Repetitive forceful compression, tensile stress, and resistive flexion, causes inflammation, swelling, and microtrauma, that results in thickening and stenosis (commonly a nodular formation) of the tendon distal to the pulley leading to a painful digital base, limitation of finger movements, triggering, snapping, locking, and deformity progressively.