Mid-term migration of a cemented total hip replacement assessed by radiostereometric analysis

Reference:

Alfaro-Adrian, J., Gill, H. S., Marks, B. E. and Murray, D. W., 1999. Mid-term migration of a cemented total hip replacement assessed by radiostereometric analysis. International Orthopaedics, 23 (3), pp. 140-144.

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Official URL:

http://dx.doi.org/10.1007/s002640050331

Related URLs:

• http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=10486023

Abstract

We have previously reported the short-term migration of cemented Hinek femoral components using radiostereometric analysis (RSA). We now report the mid-term migration. During the first 2 years after implantation the prosthesis subsided into varus and rotated internally. Between years 3 and 8 the prosthesis continued to rotate internally with the head moving posteriorly (0.07 mm/year, P=0.004). It also continued to fall into varus with the tip moving laterally (0.07 mm/year, P=0.04). The head (0.06 mm/year, P2 SD from the mean). We have demonstrated that a cemented implant has slow but significant levels of migration and rotation for at least 8 years after implantation. Our study confirms that implants with abnormally rapid posterior head migration during the second year are likely to fail.

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