Abstract: The invention concerns orthopaedic fracture apparatus involving adjustable assemblies of rods and coupling mechanisms connected to different parts of a fractured bone whereby the bone can be manipulated to and stabilized in a desired configuration. The invention provides, for such apparatus, coupling mechanisms each including a pair of clamps which are independently operable, rigidly interconnected, and have guides to secure rods and the like in mutually perpendicular directions whereby manipulation can be effected selectively in mutually perpendicular planes by loosening corresponding first clamps or second clamps of these couplings. The geometry of the remainder of the apparatus should be appropriate to this function.