Cartilage wear is a concern after hemiarthroplasty. The precise pattern of the progression of wear has not been evaluated. We previously reported the application of radiostereonetric analysis (RSA) for the measurement of cartilage wear in patients. The purpose of this study was to report the amount and the orientation of the steady state wear of cartilage between 1 and 3 years after bipolar hemiarthroplasty.
22 patients with a bipolar hemiarthroplasty for displaced femoral neck fracture were included. 10 patients completed the mean follow up of 37 months. The cartilage wear was evaluated by calculating the migration of the bipolar head in reference to the markers in the acetabulum using RSA.
The mean age of the patients at the final follow-up was 80 (range 67-91) years. The 3-D migration was -0.02 mm (SD 0.30) between 1 and 3 years. The migration in each direction was 0.03 mm (SD 0.49) in medial, 0.03 mm (SD 0.14) in proximal and 0.11 mm (SD 0.29) in posterior directions. 2 patients showed migration of more than 0.2 mm. The large initial migration seen in some patients up to 1 year did not progress further. Total wear after 37 months was 0.43 mm (SD 0.17).
Cartilage wear progressed slowly in 2 of 10 patients from 1 to 3 years. No pelvic penetration was seen. We believe that RSA will give a basic knowledge about the development and the progression of cartilage wear after hemiarthroplasty.
Hip Int 2017; 27(2): 193 - 197
Article Type: ORIGINAL RESEARCH ARTICLE
AuthorsMasako Tsukanaka, Ragnhild Ø. Støen, Wender Figved, Frede Frihagen, Lars Nordsletten, Stephan M. Röhrl
- • Accepted on 24/06/2016
- • Available online on 02/12/2016
- • Published in print on 31/03/2017
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- Tsukanaka, Masako [PubMed] [Google Scholar] 1, * Corresponding Author (firstname.lastname@example.org)
- Støen, Ragnhild Ø. [PubMed] [Google Scholar] 1
- Figved, Wender [PubMed] [Google Scholar] 2
- Frihagen, Frede [PubMed] [Google Scholar] 1
- Nordsletten, Lars [PubMed] [Google Scholar] 1
- Röhrl, Stephan M. [PubMed] [Google Scholar] 1
Department of Orthopaedic Surgery, Oslo University Hospital, Oslo - Norway
Department of Orthopaedic Surgery, Vestre Viken Hospital Trust, Baerum Hospital, Gjettum - Norway