|
Revision of metal-on-metal resurfacing arthroplasty of
the hip - THE INFLUENCE OF MALPOSITIONING OF THE COMPONENTS
2008
R. De Haan, MD, Resident in Orthopaedic Surgery1; P. A.
Campbell, PhD, Research Scientist2; E. P. Su, MD,
Orthopaedic Surgeon3; and K. A. De Smet, MD, Orthopaedic
Surgeon4
1 University Hospital Brussels, Laarbeeklaan 101, 1090
Brussels, Belgium.
2 J. Vernon Luck Snr MD, Orthopaedic Research Centre,
Orthopaedic Hospital/University of California Los Angeles,
2400 South Flower Street, Los Angeles, California 90007,
USA.
3 Hospital for Special Surgery, 535 East 70th Street, New
York, New York 10021, USA.
4 ANCA Medical Centre, Krijgslaan 181, 9000 Ghent, Belgium.
We have reviewed 42 patients who had revision of
metal-on-metal resurfacing procedures, mostly because of
problems with the acetabular component. The revisions were
carried out a mean of 26.2 months (1 to 76) after the
initial operation and most of the patients (30) were female.
Malpositioning of the acetabular component resulted in 27
revisions, mostly because of excessive abduction (mean
69.9°; 56° to 98°) or insufficient or excessive anteversion.
Seven patients had more than one reason for revision. The
mean increase in the diameter of the component was 1.8 mm (0
to 4) when exchange was needed.
Malpositioning of the components was associated with
metallosis and a high level of serum ions. The results of
revision of the femoral component to a component with a
modular head were excellent, but four patients had
dislocation after revision and four required a further
revision.
|
