Intraprosthetic Dislocation: A Specific Complication of the Dual-mobility System

• DOI: 10.1007/s11999-012-2639-2
• Publication Date: 2012-10-09T13:38:28Z
• Authors: Remi Philippot; Bertrand Boyer; Frederic Farizon
• Keywords: Adult; Aged, 80 and over; Male; Time Factors; Arthroplasty, Replacement, Hip; Middle Aged; Prosthesis Design; Biomechanical Phenomena; Prosthesis Failure; 3. Good health; Radiography; Young Adult; 03 medical and health sciences; 0302 clinical medicine; Hip Dislocation; Humans; Female; Hip Joint; Hip Prosthesis; Prospective Studies; Treatment Failure; Aged

The dual-mobility concept was proposed as an alternative to prevent postoperative dislocation events. However, intraprosthetic (IPD) is a troublesome and specific complication induced by the loss of polyethylene retentive rim escape femoral head from liner. factors associated with IPD are unknown only isolated cases have been reported do not provide clear understanding mechanisms failure.We therefore (1) identified features related different types (2) determined timing IPD.We 81 (80 patients) among 1960 primary THAs performed between January 1985 December 1998. To classify we considered perioperative (presence arthrofibrosis, cup loosening, type liner wear) radiographic (radiographic loosening or migration, ossification) features.We three following causal mechanisms: Type 1 pure without arthrofibrosis (n = 26), 2 secondary blocking 41), 3 14). mean times onset were, 11, 8, 9 years after THA, respectively. We found no difference according stem design regarding IPD.This new classification allows clinicians anticipate possible conditions they will encounter revision surgery plan (cup removal, exchange, synovectomy). implant characteristics this accounted for differences in occurrence.Level IV, therapeutic study. See Guidelines Authors complete description levels evidence.