Reverse Bennett's fracture dislocation

Case contributed by Dr Alborz Jahangiri

Presentation

Trauma to the hand. Pain, swelling and slight deformity.

Patient Data

Age: 25
Gender: Male
Modality: X-ray

Oblique fracture of the base of the 5th metacarpal bone with 2mm radial displacement of the fractured fragment and proximal displacement of the metacarpal bone by 3mm. The 5th CMC joint is also involved and results in a 3mm step. Soft tissue swelling adjacent to the fracture site is also noted.

Case Discussion

The intra-articular fracture dislocation of the base of the 5th metacarpal bone is called reverse Bennett's fracture and is analogous to Bennett's fracture of the thumb. Vigorous and unopposed pull from the extensor carpi ulnaris causes proximal migration and subluxation of the fracture fragment; these fractures are quite unstable.

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Case Information

rID: 46534
Case created: 7th Jul 2016
Last edited: 8th Jul 2016
System: Trauma
Inclusion in quiz mode: Included

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