Abstract
We report long-term results of the first clinical trial of hydroxyapatite-coated total hip arthroplasty conducted in Japan. The hemispherical cup and the straight-tapered stem were made of titanium alloy with a grit-blasted, hydroxyapatite-coated surface. The surface roughness before and after hydroxyapatite coating was 1.4 µm and 3.4 µm, respectively. Thirty-three patients (35 hips) were followed prospectively; of these, 1 patient was lost to follow-up, 5 were deceased at the latest follow-up, and 27 were followed for 11 to 14 years. Two cups and one stem (two patients) were revised. Survivorship, with radiological acetabular loosening as the endpoint, was 62.3% at 14 years. At the latest radiological follow-up, stable fixation with bone ongrowth was achieved in 46% of the acetabular cups and 89% of the femoral stems. Acetabular cups with host bone coverage of less than 60% had a high rate of failure. The suboptimal result of the hydroxyapatite-coated smooth cup indicates that porous coatings under the hydroxyapatite coating would be beneficial for hydroxyapatite-coated total hip implants, especially for the acetabular components.
Similar content being viewed by others
Author information
Authors and Affiliations
About this article
Cite this article
Miyakawa, S., Kawamura, H., Mishima, H. et al. Grit-blasted and hydroxyapatite-coated total hip arthroplasty: an 11- to 14-year follow-up study. J Orthop Sci 9, 462–467 (2004). https://doi.org/10.1007/s00776-004-0806-3
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/s00776-004-0806-3