Extensor Tendon Injuries: A New Classification, Strong Repairs, and Easier Therapy

Area of Science:

• Orthopedic Surgery
• Hand Surgery
• Reconstructive Surgery

Background:

• Extensor tendon injuries in the hand and forearm lack a unified classification system.
• Current methods for surgical repair and postoperative management vary significantly.
• This variability can lead to inconsistent outcomes for patients.

Purpose of the Study:

• To introduce a novel 5-zone classification for extensor tendons in the hand and forearm.
• To correlate this classification with surgical repair methods and expected outcomes.
• To propose standardized treatment protocols based on the new zone system.

Main Methods:

• Development of a new 5-zone classification system for extensor tendons.
• Review of surgical repair techniques (e.g., 4-strand, 6-strand repairs) applied to different zones.
• Analysis of postoperative management strategies, including splinting and early active motion.
• Comparison of outcomes based on the proposed classification.

Main Results:

• The proposed classification unifies extensor tendon zones in fingers and thumbs.
• Zone 2 repairs consistently utilize 6-strand techniques.
• Zones 1c and 3 involve varied strand repairs, with early motion post-splinting.
• Zones 4 and 5 repairs use strong methods followed by early motion, often requiring tenolysis.
• Zones 1a and 1b present unique challenges, particularly complicated open injuries.

Conclusions:

• The new 5-zone classification provides a framework for regrouping surgical methods and discussing outcomes.
• Strong surgical repairs (e.g., 6-strand) are emphasized, particularly in Zone 2.
• Postoperative management involves tailored splinting and early active motion, with principles applicable from flexor tendon repairs.
• Further validation of the classification and simpler treatment approaches are recommended.