Review of constrained acetabular component in total hip replacement.

: Recurrent dislocation following total hip replacement remains a very significant problem with indifferent results when treated conventionally. A constrained acetabular component has been developed. A cohort of 40 cases has been followed from 1-10 years (mean 3.5 years). One redislocation occurred and 2 metal shells loosened and were revised. These results demonstrate that when indicated this cup is very useful. The teoretical increase in wear debris generation caused by neck/cup impingement has not proved clinically significant, but the potential for this occurrence should limit the use of this cup to situation where it is clearly indicated. Key words: THR dislocation, constrained acetabular component.