Digital Flexor Tendinitis and Tenosynovitis (Trigger Finger) (Stenosing Flexor Tenosynovitis) By David R Steinberg, MD, Perelman School of Medicine at the University of Pennsylvania Reviewed / Revised Apr 2022 | Modified Sep 2022 View Patient Education Treatment Topic Resources Trigger Finger Digital flexor tendinitis and tenosynovitis are inflammation, sometimes with subsequent fibrosis, of tendons and tendon sheaths of the digits.