Zone I flexor tendon injuries
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Updated: Aug 18, 2026

Murine Flexor Tendon Injury and Repair Surgery
Published on: September 19, 2016
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
Abstract:
Zone I flexor tendon injuries entail injuries to the flexor digitorum profundus (FDP) tendon. These injuries occur distal to the superficialis insertion over the middle phalanx or proximal distal phalanx, and as such are isolated injuries to the FDP. The mechanism most commonly is closed avulsion from the distal phalanx or a laceration, but other mechanisms such as open avulsion or crush injury can occur. On physical examination, the cascade of the fingers will be disrupted, and distal interphalangeal (DIP) joint flexion must be isolated to determine if the FDP tendon is continuous, as other mechanisms are present to enable finger flexion at the other joints.
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