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Journal of Bone and Joint Surgery - British Volume, Vol 87-B, Issue 2, 158-162.
doi: 10.1302/0301-620X.87B2.15394  
Copyright © 2005 by British Editorial Society of Bone and Joint Surgery
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Stability of the Birmingham hip resurfacing arthroplasty at two years

A RADIOSTEREOPHOTOGRAMMETRIC ANALYSIS STUDY

R. Itayem, MD, Orthopaedic Surgeon1; A. Arndt, PhD, Assistant Professor1; L. Nistor, MD, PhD, Consultant Orthopaedic Surgeon2; D. McMinn, MD, Consultant Orthopaedic Surgeon3; and A. Lundberg, MD, PhD, Associate Professor, Consultant Orthopaedic Surgeon1

1 Department of Orthopaedic Surgery, Karolinska Institute, Karolinska University Hospital/Huddinge, SE-14186 Stockholm, Sweden.
2 Department of Orthopaedics, Nuclear Hospital, SE-54185 Skövde, Sweden.
3 Birmingham Nuffield Hospital, 22 Somerset Road, Edgbaston, Birmingham B15 2QQ, UK.

Correspondence should be sent to Dr R. Itayem; e-mail: itayem_r{at}hotmail.com

The Birmingham hip resurfacing metal-on-metal arthroplasty was introduced in 1997 and has shown promising short- to mid-term results. We used radiostereophotogrammetric analysis (RSA) to study the stability of 20 resurfacing arthroplasties over a follow-up period of 24 months.

Radiological examinations for RSA were performed immediately after surgery and at two, six, 12 and 24 months after operation. Precision and detection of migration thresholds (non-zero movement) were calculated.

All the results corresponded well to those found in similar experimental arrangements with standard hip prostheses. Migration of the cup and vertical and mediolateral migration of the head were calculated. The values were low at two years compared with those of earlier studies of cemented femoral components in conventional total hip replacements indicating that there was no evidence of excessive early migration or loosening of the components.




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Hip, Knee, Trauma, Upper limb, Foot & Ankle, Paediatrics, Oncology, Spine, Arthroplasty, General