Bennett fracture dislocation
Bennett fracture-dislocation of the thumb results from forced abduction of the thumb, and is defined as an intra-articular two-part fracture of the base of the first metacarpal bone.
- two pieces fracture dislocation of the base of the thumb metacarpal
- intra-articular extension
- dorsolateral dislocation
- small fragment of 1st metacarpal continues to articulate with trapezium
- lateral retraction of the first metacarpal shaft by abductor pollicis longus
When an intra-articular fracture of the 1st metacarpal is comminuted, producing at least three parts, it is referred to as a Rolando fracture which has a worse prognosis.
Treatment and prognosis
The fracture requires open reduction and fixation if there is significant displacement (>3 mm). Clearly, this is also influenced by the age and profession/hobbies of the patient, as a step in the articular surface will predispose to secondary osteoarthritis. If malunion or non-union occurs, a pseudoarthrosis may result.
History and etymology
It is named after Edward Hallaran Bennett (1837-1907), a surgeon from Dublin, Ireland.
epibasal (pseudo Bennett) fracture
- extra-articular fractures through the first metacarpal base
- comminuted intra-articular fracture through the first metacarpal base
Wrist and hand fractures
- wrist and hand fractures (Amsterdam wrist rules)
- distal radial fracture (Frykman classification)
- distal ulna fractures
- fracture dislocations of the radius and ulna
- carpal fractures
- metacarpal fractures
- phalanx fractures
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- 2. Manaster BJ, Disler DG, May DA et-al. Musculoskeletal imaging, the requisites. Mosby Inc. (2002) ISBN:0323011896. Read it at Google Books - Find it at Amazon