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1Principles

These injuries may be complete disruptions or partial disruptions.

Spectrum of injury – partial disruption

These injuries may be complete disruptions or partial disruptions.
The nature of the disruption may be either a tear of the tendon insertion without fracture, or a bony avulsion of the tendon from the dorsum of the base of the distal phalanx, the bony fragment being of variable size.

In incomplete tendon injuries the resulting extension lag is no greater than 30 degrees. The patient retains a partial ability actively to extend the DIP joint.