The 6-Year Migration Characteristics of a Hydroxyapatite-Coated Femoral Stem : A Radiostereometric Analysis Study |
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| Authors: | Stuart A. Callary David G. Campbell Graham E. Mercer Kjell G. Nilsson John R. Field |
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| Affiliation: | ? Discipline of Orthopaedics and Trauma, University of Adelaide and Department of Orthopaedics and Trauma, Royal Adelaide Hospital, Adelaide, South Australia, Australia;† Orthopaedic Unit, Repatriation General Hospital, Adelaide, South Australia, Australia;‡ Department of Orthopaedics, Umeå University Hospital, Umeå, Sweden;§ CORe: Comparative Orthopaedic Research Surgical Facility, Flinders University, Adelaide, South Australia, Australia |
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| Abstract: | A prospective cohort of 30 patients undergoing primary total hip arthroplasty for treatment of osteoarthritis was enrolled in a study to characterize the migration behavior of a clinically successful cementless stem. At 6 years, the mean subsidence of the stem was 0.63 mm (range, −0.33 to 3.68 mm); the mean rotation into retroversion was 1.41° (range, −1.33° to 7.48°). No stems had additional subsidence of more than 0.25 mm between 6 months and 6 years. The resultant mean subsidence between 2 and 6 years was 0.03 mm, which is below the limit measurable by radiostereometric analysis. The data demonstrate that subsidence of this cementless stem occurs within the first 6 months, after which there is persistent stabilization. |
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| Keywords: | total hip arthroplasty radiostereometric analysis subsidence stabilization |
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