Using 6 Degrees of Freedom to Systematically Reduce and Fix Distal Radius Fractures

Abstract

Six degrees of freedom (6DOF) refers to the freedom of movement of a rigid body in 3-dimensional space. Specifically, the object can move in 3 translations: up/down, left/right, and in/out, and in 3 rotations: pitch, yaw, and roll. In fracture care, the principle of 6DOF can be applied to each individual fracture fragment to help better understand fracture reduction and alignment. In the instance of a distal radius fracture, the 6DOF concept can be utilized to reduce the articular block in a systematic and controlled fashion. The articular block may be displaced in 3 translations-shortened (proximal/distal axis), dorsally translated (volar/dorsal axis), and radially translated (radial/ulnar axis). The articular block may also be displaced in 3 rotations-dorsally tilted (rotated about the radial/ulnar axis or in the sagittal plane), decreased radial inclination (rotated about the volar/dorsal axis or in the coronal plane), and supinated (rotated about the proximal/distal axis or in the axial plane). We present a surgical technique of open reduction and internal fixation of a distal radius fracture through a volar approach where we address the distal segment's instability in 6DOF in a stepwise format.