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Zone I flexor tendon injuries.

Brian A Murphy¹, Daniel P Mass

¹Department of Surgery, University of Chicago, 5841 South Maryland Avenue, MC 3079, Chicago, IL 60637-1470, USA. bmurphy@surgery.bsd.uchicago.edu

|May 11, 2005

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Zone I flexor tendon injuries involve the flexor digitorum profundus (FDP) tendon, often due to avulsion or laceration. Diagnosis requires isolating distal interphalangeal (DIP) joint flexion to assess FDP tendon integrity.

Area of Science:

Orthopedic Surgery
Hand Surgery
Sports Medicine

Background:

Zone I flexor tendon injuries affect the flexor digitorum profundus (FDP) tendon.
These injuries occur distal to the superficialis insertion, specifically over the middle or proximal distal phalanx.
They represent isolated injuries to the FDP tendon.

Purpose of the Study:

To define the characteristics of Zone I flexor tendon injuries.
To outline the common mechanisms of injury.
To emphasize the diagnostic importance of physical examination, particularly isolated distal interphalangeal (DIP) joint flexion.

Main Methods:

Review of literature on Zone I flexor tendon injuries.
Analysis of injury mechanisms including closed avulsion, laceration, open avulsion, and crush injuries.

Related Experiment Videos

Description of physical examination techniques for diagnosing FDP tendon integrity.

Main Results:

Zone I injuries are isolated to the FDP tendon.
Common mechanisms include distal phalanx avulsion and laceration.
Disrupted finger cascade and isolated DIP joint flexion are key examination findings.

Conclusions:

Accurate diagnosis of Zone I flexor tendon injuries is crucial for appropriate management.
Physical examination, focusing on isolated DIP joint flexion, is essential for confirming FDP tendon continuity.
Understanding the mechanisms aids in recognizing and treating these specific hand injuries.