First metacarpal base fracture and dislocation open reduction and internal fixation

The first metacarpal base fracture (bennett fracture) is an unstable fracture. Anatomically, the first metacarpal and most of the angular bones form a saddle joint, which is flexible and stable. When violence acts on the saddle nodule along the longitudinal axis of the thumb, an oblique fracture from the top to the bottom of the first metacarpal can be formed. . The proximal fracture block can maintain the anatomical relationship with most of the angled bones due to the attachment of the ligament and the joint capsule, while the distal fracture segment is displaced to the radial and dorsal sides due to the extension of the abductor hallucis longus muscle [Figure 1 ⑴ ]. Bennett fractures are easier to reduce, and it is more difficult to maintain alignment. After reduction, they are easily displaced and the deformity heals. Therefore, such fractures often require open reduction.

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