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We studied the migration of 58 cemented Hinek femoral components for total hip replacement, using roentgen stereophotogrammetric analysis over four years. The implants migrated faster during the first year than subsequently, and the pattern of migration in the second period was very different. During the first year they subsided, tilted into varus and internally rotated. After this there was slow distal migration with no change in orientation. None of the prostheses has yet failed. The early migration is probably caused by resorption of bone damaged by surgical trauma or the heat generated by the polymerisation of bone cement. Later migration may be due to creep in the bone cement or the surrounding fibrous membrane. The prosthesis which we studied allows the preservation of some of the femoral neck, and comparison with published migration studies of the Charnley stem suggests that this decreases rotation and may help to prevent loosening.

Type

Journal article

Journal

The Journal of bone and joint surgery. British volume

Publication Date

09/1996

Volume

78

Pages

796 - 801

Addresses

Nuffield Orthopaedic Centre, Oxford, England, UK.

Keywords

Humans, Bone Resorption, Osteoarthritis, Hip, Prosthesis Failure, Bone Cements, Photogrammetry, Follow-Up Studies, Reproducibility of Results, Predictive Value of Tests, Prosthesis Design, Hip Prosthesis, Rotation, Time Factors, Adult, Aged, Middle Aged, Female, Male