Fixation of polyethylene knee replacement tibial components in patients with osteoarthritis aged 18-60

None listed

All-polyethylene (AP) tibial components in patients aged greater than 60 years have stable tibial migration patterns and favorable survival rates when compared to identical metal-backed (MB) designs. Tibial component fixation in patients aged less than 60 years was measured with radiostereometric analysis (RSA) and compared to a previous cohort of AP and MB tibial components of identical design in patients aged greater than 60 years. Methods A prospective consecutive study examined tibial component migration in 21 patients aged less than 60 years undergoing a cemented total knee arthroplasty with an AP tibial component by RSA to 24 months. Results were compared to the authors previous series of 21 patients aged greater than 60 years that were randomized to either an AP or MB tibial component. The articulating geometry and stem design of the implants were identical as were the operative technique and post-operative regime Results At 2-years both age groups of patients implanted with an all-polyethylene component had stable migration patterns with no patient having greater than 0.2 degree rotation or 0.5mm maximum total point motion. Five of 11 metal-backed tibial components displayed continued migration between 1 and 2 years. Median internal/external rotation was greater with MB components; 0.15, 0.08, 0.28, AP < 60 years, AP > 60 years, and MB cohorts. Subsidence significantly greater for MB implants; median subsidence 0.17, 0.10, 0.25, AP < 60 years, AP > 60 years, and MB cohorts. Median maximum total point motion was greater for the MB cohort 0.34, 0.33, 0.61mm, AP < 60 years, AP > 60 years, and MB cohorts Conclusions Young patients implanted with an all-polyethylene tibial component had stable tibial migration patterns comparable to older patients with the same all-polyethylene implant. Regardless of age, all-polyethylene tibial components were at least as stable as metal-backed tibial components. The study will continue until 10-years.

No related papers found yet.