Abstract
Fifty consecutive patients (60 hips) were included in the study who underwent primary total hip arthroplasty. There were 37 men and 13 women; the average age was 46.6 years (range, 26 to 70 years). The authors used cementless Duraloc series 100 acetabular component without a screw hole, a 22 mm (inner diameter) polyethylene liner, and a cementless IPS (Immediate Postoperative Stability) femoral component in all hips. The average follow-up was 6.3 years (range, 5 to 7 years). Thigh pain was evaluated using a visual analog scale (ten points). Clinical (Harris hip score) and radiographic follow-up was performed at six weeks; at three, six and 12 months; and yearly thereafter. Linear and volumetric wear were measured by software program. Bone remodeling and osteolysis were examined.
Preoperative hip score was 42.3 points (range, 16 to 69 points). The hip score at the final follow-up was 96 points (range, 95 to 100 points). All hips had satisfactory fit of the femoral stem in both coronal and sagittal planes. There was no aseptic loosening or revision of the components. One patient (2 %) had moderate thigh pain at three months and slight pain at six months and resolved. The average linear wear was 1.60 mm (SD, 0.068) and the wear rate per year was 0.23 mm (SD, 0.013). The average volumetric wear was 607.9 mm3 (SD, 25.8). The average volumetric wear per year was 87.4 mm3 (SD, 4.9). Four hips (8 %) had osteolysis in the calcar femorale (zone 7-A) less than 1 cm in diameter.
The abstracts were prepared by Nico Verdonschot. Correspondence should be addressed to him at Orthopaedic Research Laboratory, University Medical Centre, PO Box 9101, 6500 HB Nijmegen, The Netherlands.
