Long-term results of the ABG-1 XXXX coated total hip arthroplasty: analysis of 111 cases with a minimum follow-up of 10 years.

@entity691 @entity1 @entity162 @entity738 @entity692 @entity79 @entity3061 @entity6675 @entity158 @entity3564
INTRODUCTION: Medium-term studies of ABG-1 cementless total hip arthroplasty have shown favorable functional results with excellent femoral component fixation but an abnormally high rate of periacetabular component @entity3061 , which may require early revision. HYPOTHESIS: The periacetabular @entity3061 rate increases with time with the ABG-1 implant, leading to a high revision rate. OBJECTIVE: The objective of this study was to test this hypothesis with a minimum follow-up of 10 years and evaluate the progression of periacetabular @entity3061 and its consequences on implant fixation. MATERIAL AND METHODS: A continuous series of 111 ABG-1 cementless prostheses implanted by a single operator with a theoretical minimum follow-up of 10 years. Seventy-five implants were analyzed with a mean follow-up of 13 years. All the prostheses had been implanted via a posterolateral approach and consisted of a 28 mm cup matching a head in zirconia and an antidislocation rim design high-density @entity691 insert. RESULTS: Twelve cups were revised because of progressive @entity3061 . The revisions were performed systematically although there was no @entity158 or gross cup loosening. The revisions included resection of the @entity738 , @entity6675 filling with morselized bone grafts, and implantation of new uncemented ABG-2 cups in eight cases or cemented cups associated with a support ring in the four other cases. Thirty-two (48.5%) of the cups still in place at the end of the follow-up evaluation presented moderate and asymptomatic @entity3061 , inciting close subsequent observation. No predictive factor of @entity3061 onset was identified (age, body mass index, @entity691 wear, or cup orientation). None of the femoral stems was changed because of @entity3061 : the only two femoral revisions resulted from @entity3564 and one case of @entity162 . The femoral @entity3061 images were small and all limited to zones 7a (18.8% of cases), 1a, and 1b (65.2% of cases). The overall survival rate of the series at 13 years of follow-up was 80.5%; the cup survival rate was 83.2%; the femoral implant, 94.3%; and failure of the femoral stem secondary to aseptic loosening was only 1.3%. DISCUSSION, CONCLUSION: This long-term study confirms the high frequency of @entity3061 of ABG-1 prostheses surpassing the @entity3061 rate of other uncemented cups with a @entity691 insert. The absence of predictive criteria of @entity3061 occurrence and the lack of symptoms warrants periodic follow-up of @entity1 with ABG-1 cups and, if necessary, early repair of bone stock loss with grafts combined with acetabular cup revision. This procedure remains simple as long as performed before the onset of massive @entity79 , confirming the proposed revisions in this series were judicious. This study also confirms the excellent long-term fixation of the ABG-1 femoral stems derived from the osteointegration and proximal seal around the @entity692 coating.
