Interconnected Dimensions: A Three-dimensional Computed Tomography Study of Scaphoid Size Relative to Adjacent Carpal Bones

Abstract Introduction: The accurate assessment of scaphoid bone morphometry is a prerequisite before internal fixation treatment for fractures. We intended to arrive at a method for exact quantification of the scaphoid length by measuring intact adjacent bones and the contralateral scaphoid in the normal population, which can then be translated into use for planning surgical repair in case of fracture or nonunion. Methodology: A prospective, descriptive study was conducted where three-dimensional reconstruction of the wrist with computed tomography scan was done to document lengths of the scaphoid (bilaterally), capitate, radius width, and lateral intra scaphoid angle and dorsal cortical angle of scaphoid were measured. Results: The mean scaphoid length, capitate length, and width of radius were significantly more in males as compared to females. The capitate length and contralateral scaphoid length were most significantly related to scaphoid length. The mean scaphoidcapitate ratio (SCR) was found to be 1.08. Conclusion: Using the liner regression model, scaphoid length can be predicted from variables such as capitate length and SCR with 99.99% accuracy, aiding surgeons in scaphoid fixation in cases of fractured scaphoid, malunion, and nonunion.