ارتباط زاويه جزء استابولوم در تعويض كامل مفصل هيپ با در رفتگي زودرس

The Effect of Acetabular Component Inclination on Early Dislocation Rate of Hip Arthroplasty

Background: Dislocation of total hip arthroplasty may happen for different reasons. Abnormal acetabular orientation is a common reason for such occurance. We would like to report the effect of acetabular inclination on incidence of dislocation. Methods: In a cross-sectional study all cases of total hip arthroplasty performed in a 2-yaer interval in one educational hospital in Tehran, were followed and assessed for possible dislocation in a 18.1 months (3-25 months) of follow-up. The inclination angles of acetabular components were measured, and the relationship of dislocation with gender, age and this angle was evaluated. Results: 132 cases entered the study. 4 patients (3%) encountered dislocation; and all 4 had inclination angles of over 50 degrees. Gerder did not seem to play an important role. Older age, however, was probably contributing to risk of dislocation. Conclusion: Inclination angle of over 50 degree in acetabular component position is one of the factors making it more likely for the hip arthroplasty to dislocate.