Abstract
Introduction
Revision surgery is generally recommended for recurrent dislocation following Total hip arthroplasty (THA). However, dislocation following revision THA continues to remain a problem with further dislocation rates upto 28% quoted in literature.
We present early results of one of the largest series in U.K. using dual mobility cemented acetabular cup for recurrent hip dislocation.
Methods
We retrospectively evaluated 40 patients where revision of hip replacement was performed using cemented dual mobility acetabular prosthesis for recurrent dislocations from March 2006 till August 2009 at our district general hospital by a single surgeon (senior author). The series comprised of 13 men and 27 females with average age of 73.4 years (49-92). The mean follow-up period was 23 months. (36 months –6 months).
All the hips that were revised had 3 or more dislocations, some them more than 10 times. The cause of dislocation was multifactorial in majority of cases including acetabular component malpositioning mainly due to loosening and wear. A cemented dual mobility cup was used in all cases. In six cases the femoral stem was also revised.
Results
At mean follow up of 26 months none of the revised THA had dislocated nor did they have any features of instability. No patients were lost for follow up. Clinically and radiologically there were no features of loosening of the acetabular component.
Discussion
The dual mobility cup appears to be a reliable method in treatment for recurrent total hip dislocations. Although our early results are encouraging with no loosening of acetabular components a further evaluation at longer follow- up is recommended.
