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Functional anatomy of the human digital flexor pulley system
1Department of Orthopedics, Mayo Clinic, Rochester, MN 55905.
The Journal of Hand Surgery
|November 1, 1989
Summary
This study on cadaver digits reveals how flexor tendon bowstringing over phalanges reduces finger motion. Understanding this anatomy is key for improving surgical outcomes and hand function.
Area of Science:
- Orthopedic surgery
- Anatomy
- Biomechanics
Background:
- Flexor tendon anatomy is crucial for digital motion.
- Understanding bowstringing is essential for surgical repair and rehabilitation.
Purpose of the Study:
- To analyze the anatomy of cadaver digits.
- To investigate the effects of simulated active motion and tendon bowstringing on joint motion.
Main Methods:
- Studied 55 cadaver digits using statistical analysis.
- Simulated active motion with weights on flexor tendons.
- Performed serial pulley sectioning to observe bowstringing.
Main Results:
- The Doyle and Blythe description accurately reflected observed anatomy.
- Two types of bowstringing were identified, impacting tendon excursion and joint motion.
- Consistent bowstringing over proximal and middle phalanges caused a 15% loss of motion.
- Proximal interphalangeal joint bowstringing occurred after 30 degrees of flexion due to phalangeal condyle convexity.
Conclusions:
- The anatomical description by Doyle and Blythe is validated.
- Tendon bowstringing significantly affects digital joint motion.
- Understanding these biomechanical principles can inform surgical techniques and improve patient outcomes.