Fracture of the two forearm bones and congenital radioulnar synostosis: a case report

We report a case of shaft fracture involving both forearm bones in an 18-year-old male presenting congenital radioulnar synostosis. The mechanism of fracture involved both direct blunt trauma and forced supination on forearm frame blocked in 301 pronation. Emergency osteosynthesis was performed using a standard procedure without any attempt to modify the ankylosis position. Congenital radioulnar synostosis appears to produce a rather vulnerable forearm due to restrained torsion. This notion must be taken into account in such subjects participating in contact sports which solicit pronation-supination.