Precision of periprosthetic bone mineral density measurements using Hologic Windows versus DOS-based analysis software.
Dual energy X-ray absorptiometry (DXA) is a precise tool for measuring bone mineral density (BMD) around total joint prostheses. The Hologic "metal-removal hip" analysis package (Hologic Inc., Waltham, MA) is a Microsoft DOS-based analysis platform that has undergone a change in the operating platform to a Microsoft Windows-based system that has also incorporated changes to DXA image manipulation on-screen. We evaluated the impact of these changes on instrument precision by analysis of sequential DXA scans taken on the same day using the Hologic QDR-4500A fan beam densitometer (Hologic Inc.) in 29 subjects after total hip arthroplasty. The coefficient of variation percentage (CV%) for the net pelvic region was 3.04 for Windows versus 2.36 for DOS (p>0.05). The CV% for the net femoral region was 1.75 for Windows versus 1.51 for DOS (p>0.05). Absolute BMD values for the net pelvic and net femoral regions were similar (Bland-Altman, Windows minus DOS; pelvic region mean=-1.0%; femoral region mean=1.3%; p>0.05 for both comparisons). Our results suggest that scans analyzed using each platform may be used interchangeably without the need for a calibration correction.
Shetty
Nitin R
NR
Department of Orthopaedics, Northern General Hospital, Sheffield, United Kingdom.
Hamer
Andrew J
AJ
Stockley
Ian
I
Eastell
Richard
R
Wilkinson
J Mark
JM
D015502:Absorptiometry, Photon / Q000706:statistics & numerical data*; D000328:Adult; D015519:Bone Density; D005260:Female; D006622:Hip Prosthesis / Q000706:statistics & numerical data*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012984:Software