Abstract
Previous studies have suggested that bone ongrowth occurs following revision hip arthroplasty to a tapered long stem distal fit modular prosthesis. This may affect outcome. We sought to quantify proximal bone ongrowth to one such prosthesis and correlate this with functional outcome.
A series of eight patients undergoing revision total hip arthroplasty with the a long taper, distal fit, grit blasted modular prosthesis (ZMR) had a CT performed within three months and then greater than one year following surgery. Changes in periprosthetic bone stock were measured. Functional scores at a minimum of five years were analysed.
Proximal bone ongrowth was generally poor and did not correlate with functional outcome score.
When more sensitive imaging is used to analyse bone ongrowth in this long stem distal fit prosthesis, proximal ongrowth is poor and not the key determinate of functional outcome.
In relation to the conduct of this study, no funding has been received from any source to support the costs of this study
Correspondence should be addressed to Associate Professor N. Susan Stott, Orthopaedic Department, Starship Children’s Hospital, Private Bag 92024, Auckland, New Zealand.
