The ring finger and thumb are most frequently affected. Patients present with symptomatic locking during flexion and extension of the affected digit, as the tendon catches on the stenotic pulley see video, Appendix 1, www. The first annular pulley A1 is located over the metacarpal head in the palm Figure 1. Corticosteroid injection is inexpensive and easy to perform, and it carries low risk. Aseptic technique is used to inject the steroid—lidocaine mixture into the flexor tendon sheath, at the midline of the flexor crease at the base of the digit.
The four fingers of the hand each have three bones called phalanges : proximal, middle and distal. Each phalanx is a short tubular bone. The proximal phalanx is the longest and the distal phalax is the shortest. Each proximal phalanx forms a joint with the metacarpal bone called the metacarpalphalangeal MCP joint and a joint with the middle phalanx called a proximal interphalangeal PCP joint. The MCP joints are commonly referred to as the knuckles.
Trigger finger is a condition that causes pain, stiffness, and a sensation of locking or catching when you bend and straighten your finger. The flexor tendons are long cord-like structures that attach the muscles of the forearm to the bones of the fingers. When the muscles contract, the flexor tendons allow the fingers to bend.
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