Metacarpal fractures - A method to simulate life-like fractures in human cadaveric specimens for surgical education

Metacarpal fractures are a type of fracture which trauma surgeons face frequently. Restoration of hand function is the primary objective. The aim of this study was to investigate whether life-like fractures of human cadaveric metacarpals with intact soft-tissue envelope could be simulated for surgical education. Six fresh-frozen human distal forearm and hand specimens were fractured on a custom-made drop-test bench. This reproducible method is based on a weight falling from a predefined height onto the fixed specimens. All fractures were analyzed by fluoroscopy and CT. In all specimens included in this study, several typical lesions were created, resulting in a total of 19 metacarpal fractures. There were 6 fractures involving the capital region, 5 metaphyseal fractures with partial involvement of the diaphysis and 7 pure diaphyseal fractures. One metacarpal comprised a trifocal lesion consisting of a metaphyseal undisplaced fracture, a diaphyseal wedge fracture and a non-displaced articular base fracture. Human cadaveric metacarpals with intact soft tissue can be successfully fractured by a drop-test bench setup. The resulting fractures resemble realistic fracture patterns. Load and exact load angle seem to be critical. Such fractured specimens can be used in surgical education courses. Courses providing fractured specimens with intact soft-tissue envelope can improve clinical teaching for young surgeons and experts alike.