Trabecular metal tibia still stable at 5 years: An RSA study of 36 patients aged less than 60 years

• Published in: Acta orthopaedica 2013-08, Vol.84 (4), p.398-405
• Main Authors: Henricson, Anders, Rösmark, Dan, Nilsson, Kjell G
• Format: Article
• Language: English
• Subjects: Adult; Arthroplasty, Replacement, Knee - adverse effects; Arthroplasty, Replacement, Knee - methods; Cementation - methods; Female; Follow-Up Studies; Humans; Knee; Knee Joint - surgery; Knee Prosthesis - adverse effects; Knee Prosthesis - statistics & numerical data; Male; Metals; Middle Aged; Prosthesis Design - methods; Prosthesis Failure; Radiostereometric Analysis; Tibia - surgery; Treatment Outcome
• ISSN: 1745-3674; 1745-3682; 1745-3682
• DOI: 10.3109/17453674.2013.799418

Background and purpose Clinical results of total knee replacement (TKR) are inferior in younger patients, mainly due to aseptic loosening. Coating of components with trabecular metal (TM) is a new way of enhancing fixation to bone. We have previously reported stabilization of TM tibial components at 2 years. We now report the 5-year follow-up of these patients, including RSA of their TM tibial components. Patients and methods 22 patients (26 knees) received an uncemented TM cruciate-retaining tibial component and 19 patients (21 knees) a cemented NexGen Option cruciate-retaining tibial component. Follow-up with RSA, and clinical and radiographic examinations were done at 5 years. In bilaterally operated patients, the statistical analyses included only the first-operated knee. Results Both groups had most migration within the first 3 months, the TM implants to a greater extent than the cemented implants. After 3 months, both groups stabilized and remained stable up to the 5-year follow-up. Interpretation After a high initial degree of migration, the TM tibia stabilized. This stabilization lasted for at least 5 years, which suggests a good long-term performance regarding fixation. The cemented NexGen CR tibial components showed some migration in the first 3 months and then stabilized up to the 5-year follow-up. This has not been reported previously.