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Case Reports
. 2014 Nov;55(11):e172-4.
doi: 10.11622/smedj.2014163.

Atypical Bennett's fracture-dislocation

Sean Ong, Sreedharan Sechachalam  1
Affiliations
Case Reports

Atypical Bennett's fracture-dislocation

Sean Ong et al. Singapore Med J. 2014 Nov.

Abstract

We herein report an unusual case of a fracture-dislocation of the thumb metacarpal base. The injury consisted of features typical of Bennett's fracture-dislocation of the thumb trapeziometacarpal joint, with additional rotation of the proximal fragment, signifying a greater ligamentous injury. Radiographic features of this injury are discussed together with its pathomechanics. Surgical management was undertaken due to the inherent instability of this injury.

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Figures

Fig. 1
Fig. 1
(a) Lateral and (b) anteroposterior radiographs of the right thumb show a fracture-dislocation of the TMCJ.
Fig. 2
Fig. 2
Anteroposterior radiograph of the right hand shows the distal fragment of the fracture-dislocation being pronated and dislocated dorsally.
Fig. 3
Fig. 3
(a) Pre-reduction intraoperative photograph shows the distal fragment pronated and dislocated dorsally (A); the dislocated proximal fragment, with the articular surface facing dorsoradially (B); and the articular surface of the trapezium (C). (b) Post-reduction intraoperative photograph shows restoration of a congruent trapeziometacarpal joint.
Fig. 4
Fig. 4
Intraoperative radiographs show the fixation with the Synthes® 2.0 mm modular hand system.
Fig. 5
Fig. 5
Anteroposterior radiograph of the right hand shows a typical Bennett’s fracture-dislocation.
See this image and copyright information in PMC

References

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