The use of a constrained acetabular component for recurrent dislocation.
The poor results of surgical treatment of chronic instability after total hip arthroplasty (THA) led to the development of a constrained acetabular component. In this study, 87 constrained THAs implanted for recurrent instability were reviewed retrospectively. Eighty-five hips were available for follow-up evaluation, with an average follow-up period of 58 months. These 85 hips were evaluated at a minimum of 3 years. Two recurrent dislocations were seen, caused by dissociation of the liner from the shell. Four acetabular components and 1 femoral component were revised. Overall, a 2.4% dislocation rate and an 8.2% revision rate were seen. The recurrent dislocation rate of 2.4% represents a significant improvement over other methods reported. Repeat dislocation was only seen in dissociation of cemented liners into well-fixed shells. We do not recommend this mode of fixation.
Shapiro
Gary S
GS
Illinois Bone and Joint Institute, 2401 Ravine Way, Glenview, IL 60025, USA.
Weiland
Daniel E
DE
Markel
David C
DC
Padgett
Douglas E
DE
Sculco
Thomas P
TP
Pellicci
Paul M
PM
D000077:Acetabulum; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects*; D002484:Cementation; D005260:Female; D006617:Hip Dislocation / Q000000981:diagnostic imaging / Q000209:etiology*; D006621:Hip Joint / Q000000981:diagnostic imaging; D006622:Hip Prosthesis / Q000009:adverse effects*; D006801:Humans; D008297:Male; D011474:Prosthesis Design; D011475:Prosthesis Failure; D011859:Radiography; D012008:Recurrence; D012086:Reoperation