Scaphoid dimensions and appropriate screw sizes in a Kenyan population

Abstract

Introduction: Scaphoid fractures are common and mainly affect the waist. While most injuries are amenable to non operative management, internal fixation is gaining traction due to predictable results and early return to physical activities. As scaphoid dimensions vary across populations, determining our population specific dimensions will aid in identifying appropriate screw systems.
Objective: The purpose of this study was to determine the dimensions of the scaphoid and its distal pole and relating this to commonly used screw systems.
Methods: One hundred and four human scaphoids were studied and their dimensions determined. These were compared to common screw systems.
Results: The mean length was 30.3±2.9mm with males having longer dimensions. The distal pole measured 10.1±1.0mm. There were no side to side differences in the total length or the distal pole.
Conclusion: Scaphoid screws of between 24 and 34mm with a distal threading of between 7mm and 11mm should be made available for surgeons in the region. Hospitals are advised to stock implant sizes guided by their unique population data.