Correlation between Global Wrist Laxity and Movement of the Scaphoid and the Lunate in Various Places During Radio Ulnar Deviation of the Wrist

ABSTRACT

Introduction: In the intact wrist, three dimensional motionsof the carpal bones has been reported as a screw displacementaxis representation of the motion as the angular motion ofthe bones or as translations between the bones, however thelatter has frequently been quantified as a displacement in thedirection of the screw axis. Current research aimed to establishcorrelation between global wrist laxity and movement of thescaphoid and the lunate in various places during radio ulnardeviation 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. An informed written consent was obtained. Standardposterolateral and true lateral radiograph of wrist were madeto exclude any radiological abnormality. PA and lateralradiograph were obtained in full radial and ulnar deviation.A custom-made positioning device was used to ensure properplacement of the hand and wrist during the examination.Results: We observed that the age varied from 21 years to 40years. Radial deviation varied from 10 to 25 degree with meanof 18.06 degree. Ulnar deviation varied from 25 to 60 degreewith mean of 36.51 degree. Laxity score varied from 31 to 100with mean of 64.20.Conclusion: Within the limitations of the present study,it can be concluded that the ulnar deviation of the wrist isseen to cause radial translation ad dorsal rotation of theproximal carpal row. Similarly, the radial deviation was seento cause ulnar translation and volar rotation of the proximalcarpal row.