Minimum 6year results of an uncemented trabecular metal tibial component in total knee arthroplasty

Abstract

Introduction: There are theoretical advantages of using a trabecular metal tibial component in total knee replacement (TKR) for long-term survival. We have previously reported outcomes at 3 years. We now report the clinical and radiological outcome of an unselected series of 109 knees at a minimum of 6 years follow up.

Methods: Patient function was assessed in a research clinic using Oxford Knee Score (OKS), Clinical and Functional Knee Society Score (KSS) and SF-12 physical score. Up to date weight bearing radiographs were obtained.

Results: Seventy-six knees in 72 patients were available for assessment. OKS scores were maintained from the 3-year assessment with a mean of 36.1 (8.6). KSS and SF-12 scores declined slightly but only to a degree previously reported as normal age related change. The mean KSS at follow up was 87.2 (17.7). There was no radiographic evidence of loosening in any implant. There has been 1 revision for unexplained pain at 27 months.

Conclusion: The uncemented TMT in an unselected group is performing as well as any TKR implant at this stage. Future follow up is required to ensure this is maintained. The theoretical advantages may make this the prosthesis of choice in younger patients.

Level of evidence: IV. Case series.