Journal
JOURNAL OF ARTHROPLASTY
Volume 24, Issue 1, Pages 144-151Publisher
CHURCHILL LIVINGSTONE INC MEDICAL PUBLISHERS
DOI: 10.1016/j.arth.2008.07.021
Keywords
metal-on-metal; hip resurfacing; component position; head-neck diameter ratio; range of motion; impingement
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The aim of this dry bone study was to determine the range of hip motion to impingement for different hip resurfacing cup positions and component sizes. The maximum angles of hip flexion, extension, abduction, and adduction were calculated from 3-dimensional coordinates for: 1. Cup inclination of 30 degrees, 40 degrees, 50 degrees, 60 degrees, and 70 degrees with fixed anteversion; 2. Cup anteversion of 0 degrees, 10 degrees, 25 degrees, 35 degrees, and 45 degrees with fixed inclination; and 3. 3 different component sizes on the same size dry bones. An acetabular component inclination of 50 degrees and an anteversion of 25 degrees allowed the most physiologic range of hip motion. A larger-diameter femoral component relative to the native femoral neck diameter resulted in a greater range of hip motion to impingement.
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