CEMENTLESS DUAL MOBILITY CUP IN TOTAL HIP ARTHROPLASTY REVISION

BACKGROUND PURPOSES dislocation is a classical complication in total hip arthroplasty (THA) revision. Cup fixation is the second concern. Since 1998 we routinely use cementless Dual mobility cup (DMC) in revision surgery. In order to know outcomes at 2 years, we followed a prospective series of 78 patients treated in our institution. Purpose is to demonstrate that DMC used in revision THA is safe as regards dislocation risk and bone fixation. MATERIAL METHODS from January 2010 to January 2012 we collected cohort of 79 cases on 78 patients. Patients have been followed with a clinical and radio graphical standard examination. Mean delay between index surgery and revision was 12,9 years. Mean age at revision was 75,5 years. Two different types of DMC were used: standard DMC in 68 cases. In severe bone loss, a specific revision cup was used in 11 cases. RESULTS at 2 years follow up, 65 patients have been reviewed. 5 patients are definitely lost to follow up. 8 patients deceased. One patient dislocated her hip at 1 month. Two early mechanical failures occurred DISCUSSION purpose of this short term follow up study is to emphasize low risk of dislocation and trustable fixation of a cementless DMC used in revision THA. THA. Instability is the leading cause of failure. In our series dislocation rate is 1,2%‥ 2 patients presented an early mechanical cup failure (2.5%). CONCLUSION considering outcomes of this series, we may assess that in in THA revision surgery, DMC can be recommended.