Journal
INTERNATIONAL ORTHOPAEDICS
Volume 28, Issue 4, Pages 198-201Publisher
SPRINGER
DOI: 10.1007/s00264-004-0542-5
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We studied 105 patients who received a total hip arthroplasty between June 1985 and August 2001 using freehand positioning of the acetabular cup. Using pelvic CT scan and the hip-plan module of SurgiGATE-System (Medivision, Oberdorf, Switzerland), we measured the angles of inclination and anteversion of the cup. Mean inclination angle was 45.8degrees+/-10.1degrees (range: 23.0-71.5degrees) and mean anteversion angle was 27.3degrees+/-15.0degrees (range: -23.5degrees to 59.0degrees). We compared the results to the safe position as defined by Lewinnek et al. and found that only 27/105 cups were implanted within the limits of the safe position. We conclude that a safe position as defined by Lewinnek et al. [13] was only achieved in a minority of the cups that were implanted freehand.
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