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