Rotational Shift of Proximal Carpal Row and it's Correlation with Global Wrist Joint Laxity

ABSTRACT

Introduction: As the wrist moves to ulnar deviation, theproximal carpal row undergoes radial translation, dorsalrotation and supination. Similarly, the radial deviationinvolves ulnar translation of the proximal carpal row, its volarrotation and pronation. These combined movements of theproximal carpal row are called rotational shift of the carpus.Study aimed to quantify the rotational shift of the proximalcarpal row during ulnar or radial deviation of the wrist.Material and methods: The proposed study was a prospectivestudy conducted in the Department of Orthopedics, RMCH,Bareilly, UP comprising 100 healthy volunteers with equal sexration who never had any symptoms pertaining to their wristjoint. PA and lateral radiograph were obtained in full radialand ulnar deviation. A custom-made positioning device wasused to ensure proper placement of the hand and wrist duringthe examination.Results: In the present study, we observed that theradioscaphoid angle in radiation deviation varied from 50to 85 degree with mean of 68.96 degree. Radioulnate anglein radial deviation varied from -2 to 45 degree with mean of17.79 degree. Radioscaphoid angle in ulnar deviation variedfrom 10 to 70 degree with mean of 39.97 degree. Radioulnateangle in ulnar deviation varied from -3 to -38 degree withmean of -17.15 degree.Conclusion: Within the limitations of the present study, itcan be concluded that the ulnar deviation of the wrist is seento cause radial translation ad dorsal rotation of the proximalcarpal row. Similarly, the radial deviation was seen to causeulnar translation and volar rotation of the proximal carpal row.