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The effect of acetabular component inclination on early dislocation rate of hip arthroplasty

Firouz Madadi MD, Seyyed Reza Aghapour MD, Ali Akbar Esmaeeliejah MD, Seyyed Mohammad Qoreishy MD*, Hamid Reza Seyyed Hosseinzadeh MD

Shahid Beheshti University of Medical Sciences, Tehran, Iran
* Corresponding Author

Introduction: Dislocation after total hip arthroplasty may have many underlying reasons. Abnormal acetabular cup orientation is a major reason for this to happen. We have assessed this factor in our patients to determine how important it is.

Materials and methods: In this descriptive cross sectional study, all cases of total hip arthroplasties performed in a 5-year interval in one educational hospital in Tehran were assessed for dislocation during their postoperative follow-up. The inclination angle of the acetabular components were measured and the relationship between dislocation and gender, age and this angle was evaluated.

Results: 441 THA's in 363 patients entered the study. 7 patients (1.5%) had dislocation in the follow-up period, all of whom had an inclination angle of over 50 degrees. Gender did not seem to affect the dislocation rate, older age, however, may probably play an important role as a risk factor for dislocation following THA.

Conclusion: Inclination angle of greater than 50 degrees in the acetabular component must be considered as a risk factor for dislocation following THA.

Keywords: Arthroplasty, Hip, Acetabular component, Dislocation