Trigger Finger Anatomy
To better understand trigger finger, it helps to understand the anatomy of the finger.
Tendons are strong bands of tissue that connect muscle to bone. Each muscle has two tendons, each of which attach to a bone. The bones come together to form a joint. When a muscle contracts, the tendons pull on the bones, resulting in movement of the joint.
The tendons in the fingers pass through ligaments, which act as pulleys.
The ligaments keep the tendons in place as the fingers move.
- Benson LS, Ptaszek AJ. Injection versus surgery in the treatment of trigger finger. J Hand Surg [Am]. 1997 Jan;22(1):138-44. 
- Cardon LJ, Ezaki M, Carter PR. Trigger finger in children. J Hand Surg [Am]. 1999 Nov;24(6):1156-61. 
- Finsen V, Hagen S. Surgery for trigger finger. Hand Surg. 2003 Dec;8(2):201-3.