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Clinical Orthopaedics and Related Research®

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01-07-2012 | Clinical Research

Fixation Failures of Dual Mobility Cups: A Mid-term Study of 2601 Hip Replacements

Authors: Philippe Massin, MD, PhD, Vincent Orain, MD, Rémi Philippot, MD, Frederic Farizon, MD, PhD, Michel Henry Fessy, MD, PhD

Published in: Clinical Orthopaedics and Related Research® | Issue 7/2012

Abstract

Background

The use of dual-mobility cups has increased because of a low rate of dislocations combined with a 96% 15-year survival rate. However, late cup migrations have been attributed to their fixation (tripod - exact fit with two pegs and one extraacetabular screw) and the absence of porous coating. In a second-generation device, the designs were modified to achieve press-fit fixation and a layer of titanium beads was sintered on stainless steel cups.

Questions/purposes

We therefore (1) determined the midterm survival of press-fit, grit-blasted, second-generation cups with or without additional screws, compared with original tripod and (2) compared survival of grit-blasted dual-mobility cups with bimetallic porous-coated cups.

Methods

From a multiinstitutional trial, we reviewed 2408 patients with osteoarthritis implanted with 2601 prostheses of seven designs of a second-generation dual-mobility cup. The criteria for failure were migration, widening radiolucencies in any zone of the interface, or revision for cup loosening. The minimum followup was 5 years (mean, 7.7 years; range, 5–11 years).

Results

The 8-year survival rate of press-fit, grit-blasted cups was lower than that for press-fit, grit-blasted cups fixed with screws (91% versus 100%) and for tripod fixation (98%). The 8-year survival rate of press-fit, grit-blasted cups was less than that for press-fit, porous-coated cups made of the same alloy (91% versus 95%).

Conclusions

The data suggested primary fixation of grit-blasted dual-mobility cups should be secured with screws. Porous coating sintered on the convex side improved midterm survivorship. No deleterious effect of metallosis resulted from sintered titanium beads on stainless steel. Long-term followup is required to confirm these findings.

Level of Evidence

Level IV, therapeutic study. See Guidelines for Authors for a complete description of levels of evidence.

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Title: Fixation Failures of Dual Mobility Cups: A Mid-term Study of 2601 Hip Replacements
Authors: Philippe Massin, MD, PhD
Vincent Orain, MD
Rémi Philippot, MD
Frederic Farizon, MD, PhD
Michel Henry Fessy, MD, PhD
Publication date: 01-07-2012
Publisher: Springer-Verlag
Published in: Clinical Orthopaedics and Related Research® / Issue 7/2012
Print ISSN: 0009-921X
Electronic ISSN: 1528-1132
DOI: https://doi.org/10.1007/s11999-011-2213-3

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Fixation Failures of Dual Mobility Cups: A Mid-term Study of 2601 Hip Replacements

Abstract

Background

Questions/purposes

Methods

Results

Conclusions

Level of Evidence

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Background

Questions/purposes

Methods

Results

Conclusions

Level of Evidence

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