بررسي اثر اولنار واريانس در بيماري كين باخ

The role of ulnar variance in kienbock"s disease

Background: The etiology of Kienbock ʹs disease is not clear definitely. Lunate blood supply, its shape and ulnar variance have been counted as the etiologies of this disease. For years, ulnar variance supposed to be an important predisposing factor for Kienbockʹs disease . There are controversies on the role of ulnar variance in Kienbockʹs disease and it has recently been stated that negative ulnar variance is not a risk factor for Kienbockʹs disease . The aim of this study was to elucidate the role of the negative ulnar variance in Kienbockʹs disease in Iranian patients. Methods: In this study, ulnar variance was measured in standardized condition in 90 normal wrists and in 67 patients with Kienbockʹs disease who had undergone surgery over the past 15 years . The correlation between age, sex and ulnar variance was assessed . We tried to determine the role of ulnar variance in the development of Kienbockʹs disease . Findings: Mean ulnar variance in the control group was 0.477 millimeter and in the group with Kienbockʹs disease, it was -0.995 millimeter. Regarding age, both groups were similar and after stratification by sex, we found that sex had no role in the development of disease . The correlations between age and ulnar variance, and sex and ulnar variance in the control group were not statistically significant. However, comparing case and control groups, we found statistically significant correlation between negative ulnar variance and Kienbockʹs disease . Conclusion: In spite of recent reports, negative ulnar variance is a predisposing risk factor for the development of Kienbockʹs disease