A study of the Elite Plus femoral component using radiostereometric analysis.
We performed a three-year radiostereometric analysis (RSA) study of the Elite Plus femoral component on 25 patients undergoing primary total hip replacement. Additional assessments and measurements from standard radiographs were also made. Subsidence of the stem occurred at the cement-stem interface. At 36 months the subsidence of the stem centroid was a mean of 0.30 mm (0.02 to 1.28), and was continuing at a slow rate. At the same time point, internal rotation and posterior migration of the femoral head had ceased. One stem migrated excessively and additional assessments suggested that this was probably due to high patient demand. The failure rate of 4% in our study is consistent with data from arthroplasty registers but contrasts with poor results from another RSA study, and from some clinical studies. We believe that the surgical technique, particularly the use of high-viscosity cement, may have been an important factor contributing to our results.
Derbyshire
B
B
Wrightington Wigan and Leigh NHS Trust, Centre for Hip Surgery Wrightington Hospital, Hall Lane, Appley Bridge WN6 9EP, UK. Brian.Derbyshire@wwl.nhs.uk
Porter
M L
ML
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects / Q000379:methods* / Q000592:standards; D001843:Bone Cements; D005260:Female; D006622:Hip Prosthesis / Q000592:standards*; D006801:Humans; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000000981:diagnostic imaging* / Q000601:surgery; D011183:Postoperative Complications / Q000000981:diagnostic imaging* / Q000209:etiology; D011475:Prosthesis Failure; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*
D001843:Bone Cements