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Journal of Bone and Joint Surgery - British Volume, Vol 90-B, Issue 12, 1585-1593.
doi: 10.1302/0301-620X.90B12.20797  
Copyright © 2008 by British Editorial Society of Bone and Joint Surgery
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A trabecular metal tibial component in total knee replacement in patients younger than 60 years

A TWO-YEAR RADIOSTEREOPHOTOGRAMMETRIC ANALYSIS

A. Henricson, MD, PhD, Consultant Orthopaedic Surgeon1; L. Linder, MD, PhD, Professor and Consultant Orthopaedic Surgeon2; and K. G. Nilsson, MD, PhD, FRACS, Professor and Consultant Orthopaedic Surgeon3

1 Department of Orthopaedics, Falu General Hospital, S-791 82 Falun, Sweden.
2 Department of Orthopaedics, Hässleholm Hospital, S-281 25 Hässleholm, Sweden.
3 Department of Orthopaedics, Umeå University Hospital, S-901 85 Umeå, Sweden.

Correspondence should be sent to Professor K. G. Nilsson; e-mail: kjell.g.nilsson{at}orthop.umu.se

We compared the performance of uncemented trabecular metal tibial components in total knee replacement with that of cemented tibial components in patients younger than 60 years over two years using radiostereophotogrammetric analysis (RSA). A total of 22 consecutive patients (mean age 53 years, 33 to 59, 26 knees) received an uncemented NexGen trabecular metal cruciate-retaining monobloc tibial component and 19 (mean 53 years, 44 to 59, 21 knees) a cemented NexGen Option cruciate-retaining modular tibial component.

All the trabecular metal components migrated during the initial three months and then stabilised. The exception was external rotation, which did not stabilise until 12 months. Unlike conventional metal-backed implants which displayed a tilting migration comprising subsidence and lift-off from the tibial tray, most of the trabecular metal components showed subsidence only, probably due to the elasticity of the implant.

This pattern of subsidence is regarded as being beneficial for uncemented fixation.






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Hip, Knee, Trauma, Upper limb, Foot & Ankle, Paediatrics, Oncology, Spine, Arthroplasty, General