Instrument for treatment of spinal fractures, scoliosis and the like

An instrument for the treatment of spinal fractures, scoliosis and the like comprising a rod threaded at each end and having a flat at each end, a hook at each end of the rod for engagement with a vertebra, said hooks being movable axially of the rod and rotatable about the rod, and means for securing said hooks at selected positions axially of the rod and angularly about the axis of the rod, said securing means comprising two nuts engaging said threads at each end of the rod, there being a nut on each side of each hook, and a washer at each end of the rod between one of said nuts and its adjacent hook, each washer having a flat engaging the flat on the rod, and radially directed ribs on said washer and on the adjacent face of said hook to prevent rotation of said hooks when said washer is pressed against said hook.