Trigger thumb (stenosing flexor tenosynovitis)—when trigger finger affects the thumb—is a common cause of thumb pain. It affects the flexor tendon that bends the thumb and can also affect any ...

In this patient, the tendon sheath showed pathological thickening and increased fluid within it, typical of tenosynovitis (figure 1).

If tenosynovitis or tendon damage is detected ... Participants underwent ultrasound exams of their flexor and extensor tendons. Clinical exams to check for pain and functional impairment were ...