Bennett's fracture
Original Editors
Top Contributors - Claire Knott, Annelies Noppe, Lucinda hampton, Nikhil Benhur Abburi, WikiSysop and Kim Jackson
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Definition/Description[edit | edit source]
Bennett fracture dislocation is an intra-articular fracture of the base of the first metacarpal which leads to dislocation of the first carpometacarpal joint. The fracture involves the joint between the first metacarpal and the proximate carpal bone, the trapezium. The fracture is unstable and has an inadequate reduction/fixation which leads to long term consequences such as osteoarthritis, weakness, or loss of function of the first carpometacarpal joint.1 This joint is called the carpometacarpal (CMC) joint, and is normally stabilized by a ligament called the deep ulnar ligament. Due to the position of the fracture fragment there is some detachment of this ligament from the bone, causing a dislocation of the joint.2
Clinically Relevant Anatomy[edit | edit source]
The first carpometacarpal joint is unique, it has only an articulation between the trapezium and the base of the first metacarpal. The articulation is saddle-shaped which allows greater motion. In a Bennett fracture is the volar oblique ligament, which inserts at the base of the first metacarpal, an important ligament.1 The ligaments in this joint are the anterior (volar) and posterior oblique ligaments, the anterior and posterior intermetacarpal ligaments, and the dorsal radial ligament. The anterior oblique ligament is the most important for stability in the Carpo-metacarpal joint.3
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