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The Journal of Arthroplasty, ISSN: 0883-5403, Vol: 20, Issue: 2, Page: 244-249
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Migration of Cemented Stem and Restrictor After Total Hip Arthroplasty
Catani, Fabio; Ensini, Andrea; Leardini, Alberto; Bragonzoni, Laura; Toksvig-Larsen, Soren; Giannini, SandroHip
The aim of this study was to investigate the migration pattern of the Lubinus SP II prosthesis stem. Migration at the stem-cement and at the bone-cement interface was assessed. Twenty-five patients were studied by radiostereometry during a period of 2 years. The migration of the head, of 2 points on the collar, of the stem tip, and also of the cement restrictor, was measured. The collar and the head were found stable at 2 years’ follow-up, whereas an anterior migration occurred at the stem tip (median, 0.3 mm; 25th percentile, 0.04 mm; 75th percentile, 1.27 mm). Virtually no subsidence or axial rotation of the stems was observed. An anterior migration of the restrictor marker was also observed, compatible with a rigid sagittal plane rotation of the stem and of the cement mantle about the collar. Therefore, stem tip migration occurred at the bone-cement interface.
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