Hand Fractures
Classification
It is important to distinguish the intra-articular fractures (Type I [Bennett's] + II [Rolando's]) from the extra-articular (III + IV) fractures, as the extra-articular fractures can be managed adequately with non-operative management
Up to 30°
of angulation of the 1st metacarpal base can be accommodated due the large ROM at the trapezio-metacarpal joint
Bennett's Fracture
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A fracture-dislocation, first described by Bennett in 1882
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Mechanism of injury is an axial blow directed against the partially flexed metacarpal
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Fracture line separates the major part of the metacarpal from a small volar lip fragment, producing disruption of the CMC joint
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An avulsion fracture occurs rather than a pure dislocation because of the strength of the anterior oblique ligament (AOL)
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