A 10-year clinical and radiological outcome study of posterior-stabilized total knee arthroplasty with an oxidized zirconium femoral component.

BACKGROUND

This study aimed to assess long-term survival and clinical outcomes of a posterior-stabilized total knee arthroplasty (TKA) using an Oxidized Zirconium (OxZr) femoral component after a minimum 10-year follow-up.

METHODS

A retrospective analysis was conducted on 183 TKAs in 180 patients treated with OxZr femoral component between January 2011 and December 2012. Patients had end-stage knee osteoarthritis and failed medical treatment. Exclusion criteria included the use of extension stems, bone reconstruction, or loss to follow-up. Mean follow-up was 10.39 ± 0.49 years. Primary endpoint was implant survival; secondary endpoints included functional and radiographic outcomes.

RESULTS

Eleven revisions were performed, all due to aseptic loosening of the tibial component. The 10-year survival rate for aseptic loosening was 94% (95% CI: 90.6-97.5%), and overall survival was 89.1% (95% CI: 84.7-93.7%). Functional scores improved significantly: the IKS function score rose from 50.7 ± 11.5 to 83.2 ± 13.9, and the IKS knee score from 67.5 ± 8.3 to 88.9 ± 8.2 (both p < 0.001). Satisfaction was high, with 73.3% of patients reporting being satisfied or very satisfied. Radiolucent lines appeared in 36.6% of cases. Cement type and operative time were significant risk factors for tibial loosening.

CONCLUSION

The TKA with an OxZr femoral component showed good long-term survival and functional outcomes, though tibial loosening remains a concern, potentially linked to cement type.