Diagnosis: Mallet Finger
- It is a deformity caused by loss of extensor-tendon continuity to the DIP joint.
- It is a misnomer - mallet = a hammer with a large wooden head, which does not look like this type of deformity.
- There are many causes of mallet finger: the common one is laceration of extensor tendon but it may not leave a residual deformity. Other causes are intra-articular fracture of distal phalanx, tendon rupture or avulsion. Therefore, it may or may not be associated with a fracture.
Stark HH, et al. Mallet finger. J Bone J Surg 1962;44:1061-1068.