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

Journal article

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, P<0.0001), shoulder (0.04 mm/year, P=0.0001) and tip (0.04 mm/year, P=0.001) continued to migrate distally. There were two cases of failure due to aseptic loosening during the follow-up period. During the second year both of these had posterior head migration, which was abnormally rapid (>2 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.

Authors: Alfaro-Adrian, J; Gill, H; Marks, B; Murray, D

• Publication status: Published
• Journal: International orthopaedics
• Volume: 23
• Issue: 3
• Pages: 140-144
• Publication date: 1999-01-01
• DOI: 10.1007/s002640050331
• EISSN: 1432-5195
• ISSN: 0341-2695
• Language: English
• Keywords: Photogrammetry; Prosthesis Failure; Prognosis; Humans; Evaluation Studies as Topic; Movement; Male; Female; Hip Prosthesis; Foreign-Body Migration; Bone Cements; Follow-Up Studies; Prosthesis Design; Hip Joint