Clinical Orthopaedics and Related Research

, Volume 467, Issue 2, pp 465–472

Use of a Dual Mobility Socket to Manage Total Hip Arthroplasty Instability

Authors

    • Département de Chirurgie OrthopédiqueHôpital Edouard Herriot, Pavillon T
    • Laboratoire de Biomécanique des Chocs, LBMC–INRETS URMT 9406Université Claude Bernard
  • Vincent Pibarot
    • Département de Chirurgie OrthopédiqueHôpital Edouard Herriot, Pavillon T
  • Gualter Vaz
    • Département de Chirurgie OrthopédiqueHôpital Edouard Herriot, Pavillon T
  • Christophe Chevillotte
    • Département de Chirurgie OrthopédiqueHôpital Edouard Herriot, Pavillon T
  • Jacques Béjui-Hugues
    • Département de Chirurgie OrthopédiqueHôpital Edouard Herriot, Pavillon T
Original Article

DOI: 10.1007/s11999-008-0476-0

Cite this article as:
Guyen, O., Pibarot, V., Vaz, G. et al. Clin Orthop Relat Res (2009) 467: 465. doi:10.1007/s11999-008-0476-0

Abstract

Unconstrained tripolar hip implants provide an additional bearing using a mobile polyethylene component between the prosthetic head and the outer metal shell. Such a design increases the effective head diameter and therefore is an attractive option in challenging situations of unstable total hip arthroplasties. We report our experience with 54 patients treated using this dual mobility implant in such situations. We ascertained its ability to restore and maintain stability, and examined component loosening and component failure. At a minimum followup of 2.2 years (mean, 4 years; range, 2.2–6.8 years), one hip had redislocated 2 months postoperatively and was managed successfully without reoperation by closed reduction with no additional dislocation. Two patients required revision of the implant because of dislocation at the inner bearing. Technical errors were responsible for these failures. Three patients had reoperations for deep infections. The postoperative radiographs at latest followup showed very satisfactory osseointegration of the acetabular component because no radiolucent line or osteolysis was reported. Use of this unconstrained tripolar design was successful in restoring and maintaining hip stability. We observed encouraging results at short-term followup regarding potential for loosening or mechanical failures.

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

Copyright information

© The Association of Bone and Joint Surgeons 2008