A central threadless shaft screw is better than a fully threaded variable pitch screw for unstable scaphoid nonunion: A biomechanical study

Introduction An interpositional wedge bone graft is a procedure performed to restore carpal height and scaphoid length for displaced scaphoid nonunions with carpal instability. The purpose of this study was to investigate which headless screw design (threadless central shaft screw or fully threaded variable pitch compression screw) is biomechanically preferred when an interpositional bone graft is needed. Methods A total of 24 cadaveric scaphoid...