[Survival of cementless dual mobility sockets: ten-year follow-up]

Rev Chir Orthop Reparatrice Appar Mot. 2006 Jun;92(4):326-31. doi: 10.1016/s0035-1040(06)75762-2.
[Article in French]

Abstract

Purpose of the study: We report a retrospective series of 106 total hip prosthesis with ten years follow-up. The purpose of this study was to analyze survival of cementless dual mobility sockets.

Material and methods: The series included 90 consecutive patients with 106 first-intention total hip prosthesis, all with cementless dual mobility sockets. All prosthesis (Novae-1 socket and Profil-1 stem, Serf) were implanted within a 6-month period. The stainless steal socket was coated with alumina and had two short anchorage studs and a superior mooring screw and a polyethylene retentive liner. The stem had a 22.2 mm chromium cobalt head. The main indication for arthroplasty was degenerative joint disease. Mean age at implantation was 56 years (range 23-87). All patients were seen for physical examination and x-rays every two or three years. We noted cup survival at ten years (actuarial method), defining surgical revision for cup replacement due to an aseptic cause as the endpoint.

Results: Twelve patients died during the 10-year follow-up and one was lost to follow-up. The Postel-Merle d'Aubligné score improved from 7.1 preoperatively to 15.8 at ten years. There were two isolated acetabular loosenings, two intra-prosthetic dislocations due to advanced wear of the polyethylene insert. The overall survival rate of the socket was 94.6% at ten years. There were no episodes of prosthetic instability in this series.

Discussion: This study demonstrates the good ten-year survival of the dual mobility socket, comparable to that of conventional prostheses. The absence of any case of prosthetic instability in this series confirms the good short-term and long-term stability of the dual mobility socket. Intraprosthetic dislocation, due to loss of the polyethylene retaining ring is the main limitation of this method. The incidence was however low (2% at ten years) and treatment was not a problem. We recommend using the dual-mobility socket as the first-intention implant for patients with a high risk of post-operative instability, but also recommend it for all patients aged over 70 years since instability is the leading cause of surgical revision after this age.

Publication types

  • Comparative Study
  • English Abstract

MeSH terms

  • Adult
  • Age Factors
  • Aged
  • Aged, 80 and over
  • Aluminum
  • Arthroplasty, Replacement, Hip* / instrumentation
  • Arthroplasty, Replacement, Hip* / methods
  • Chromium Alloys
  • Data Interpretation, Statistical
  • Follow-Up Studies
  • Hip Prosthesis*
  • Humans
  • Middle Aged
  • Polyethylenes
  • Prosthesis Design
  • Prosthesis Failure
  • Retrospective Studies
  • Stainless Steel
  • Time Factors

Substances

  • Chromium Alloys
  • Polyethylenes
  • Stainless Steel
  • Aluminum