BACKGROUND: A modern patello-femoral joint arthroplasty (PFA) prosthesis featuring a sided trochlea on-lay component produced in oxinium (i.e., oxidized zirconium) has been introduced recently to reduce wear and increase wettability. Good medium-term functional outcome and survivorship have been documented as of yet. The aim of this study was to explore the long-term outcomes in a consecutive series with 10-year follow-up.
METHODS: Data were collected between September 2005 and November 2014 and a total of 161 modern PFJ replacements with a mean follow-up of 13.8 years (range 2 to 22 years) were considered. The primary outcome was the assessment of implant survivorship and revisions 10 years post-operatively and beyond. Secondary outcomes included the assessment of the Oxford Knee Score (OKS) preoperatively, one and five years post-operatively in addition to complications and all-cause mortality.
RESULTS: The revision free survival of this modern implant was 92% at 5y, 81% at 10y, 78% at 15y and 75% at 20 years, and there was no effect for sex (P = 0.371), nor age (P = 0.902),nor side (P = 0.554).The mean preoperative and five-year postoperative OKSs were 18.83 (SD 7.51) and 30.00 (SD 12.77), respectively (mean difference was 11.17 [95% CI 8.17 to 14.17]; P < 0.0001). There was a total of 41 revisions, with the most common reason being progression of osteoarthritis (n = 24).
CONCLUSIONS: This study shows satisfactory implant survivorship 20 years post-operatively and good functional outcomes up to 5 years postoperatively.
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