<prompt> Pathognomic sign of traumatic fracture isTendernessSwellingCrepitusBruising  <response>: C. i.e. Crepitus 545 - Apley 8th Crepitus or abnormal movement is pathognomic to traumatic fracture. Posterior - interosseous nerve invovemet in Monteggia fracture dislocation Peroneal nerve involvement in knee dislocationMotor cyclists fractures - The motorcyclists sustains a ring fracture and the pillion rider an atlanto - occipital avulsion with dural tear Anteroflexion without impact on the occiput seems to be a rare casual mechanism of the ring fracture. 