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Type: Journal article
Title: Long-term migration characteristics of the Corail hydroxyapatite-coated femoral stem: a 14-year radiostereometric analysis follow-up study
Author: Critchley, O.
Callary, S.
Mercer, G.
Campbell, D.
Wilson, C.
Citation: Archives of Orthopaedic and Trauma Surgery, 2020; 140(1):121-127
Publisher: Springer-Verlag
Issue Date: 2020
ISSN: 0936-8051
Statement of
Owain Critchley, Stuart Callary, Graham Mercer, David Campbell, Christopher Wilson
Abstract: BACKGROUND:The magnitude and pattern of acceptable long-term migration of cementless femoral stems are not well understood. The Corail hydroxyapatite-coated cementless stem is a clinically successful and commonly used femoral stem with a long-term migration pattern not previously described in the literature. The aim of this study was to assess the long-term migration of the Corail hydroxyapatite-coated cementless stem using radiostereometric analysis (RSA) at 14-year follow-up, thereby establishing a benchmark acceptable long-term migration pattern for hydroxyapatite-coated cementless prostheses. MATERIALS AND METHODS:A prospective cohort of 29 patients (30 hips) undergoing primary total hip arthroplasty for primary hip osteoarthritis were enrolled into a study to characterise the migration of the Corail cementless stem. A total of 13 patients (4 males, 9 females) with mean age 82 (range 68-92) underwent repeat RSA radiographs at minimum 10 years post-operation (mean 13.9 years, range 13.3-14.4). Subsidence of the stem was measured and compared to prior measurements taken at 6 months and 1, 2, and 6 years. RESULTS:None of the 13 patients have been revised. The migration at 6 months, 1 year, 2 years, and 6 years has been previously recorded. At mean 14-year follow-up, the cohort mean subsidence of the cementless stem was 0.70 mm (range - 0.06 to 3.61 mm). For each stem followed up at 6 months and 14 years, the mean subsidence over this period was 0.05 mm (range - 0.14 to 0.57 mm). There is no significant difference in mean subsidence at 6 months and 14 years (p = 0.43). CONCLUSIONS:The long-term pattern of the subsidence of the Corail femoral stem has not previously been described. Subsidence occurs within the first 6 months, after which there is persistent stabilisation of the implant to 14 years. This study provides a description of a long-term acceptable migration pattern to which new hydroxyapatite-coated cementless prostheses may be compared. LEVEL OF EVIDENCE II.
Keywords: Total hip arthroplasty
Radiostereometric analysis
Description: Published online: 26 October 2019
Rights: © Springer-Verlag GmbH Germany, part of Springer Nature 2019
DOI: 10.1007/s00402-019-03291-8
Appears in Collections:Aurora harvest 8
Orthopaedics and Trauma publications

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