Abstracts Posters SICOT-SOF meeting Gothenburg 2010 _2_

Poster
Topic: Arthroplasty - Hip
Abstract number: 24152
CUP POSITIONING AT A TERTIARY HOSPITAL: RISK FACTORS FOR
MALPOSITIONING
Henrik MALCHAU, Mark CALLANAN, Bryan JARRETT, Charles BRAGDON, Andrew
FREIBERG, Harry RUBASH
Massachusetts General Hospital, Boston (UNITED STATES)
Introduction: This study was performed to determine if a correlation exists between
patient and surgical factors and acetabular component position.Methods: Post-op
anteroposterior (AP) pelvis and cross-table lateral radiographs were obtained for
2061 patients receiving a total hip arthroplasty or hip resurfacing from 2004-2008.
The AP radiograph was measured using Hip Analysis Suite to determine cup
inclination and version angles, using the lateral film to determine version direction.
Acceptable ranges were defined for abduction (30-45°) and version (5-25°).
Correlations between factors and cup angles were determined using a multivariate
logistic regression.Results: From 1952 qualifying hips, 1823 had both version and
abduction angles. Of those, 1144 (63%) acetabular cups were within the abduction
range, 1441 (79%) were within the version range, and 917 (50%) were within the
range for both. Multivariate analysis showed that surgical approach (p