Which of the following regarding metacarpal neck fractures is true?
ExplanationMost hand surgeons would agree that there is between 15 and 30 of mobility at the carpometacarpal (CMC) joint of the ring and little fingers. This allows the surgeon to accept large amounts of deformity at the distal metacarpal neck fracture. There is still poor consensus on how much deformity to accept but 70 is still reasonable. There is consensus on the index and to a lesser degree middle finger. They do not have much compensation so 10–15 is the maximum, allowed deformity. The Jahss manoeuvre must not be confused with the Jahss position (metacarpophalangeal (MCP) and proximal interphalangeal (PIP) flexion to 90). The manoeuvre is good, the position is no longer acceptable.
