TKA with cementless metal-backed patella yielded ‘excellent’ survivorship, outcomes
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Results showed patients who underwent total knee arthroplasty with a cementless 3D-printed metal-backed patella had “excellent” survivorship and clinical and radiographic outcomes at 2 and 5 years.
Luis C. Grau, MD, and colleagues compared preoperative and postoperative clinical outcome scores among patients who underwent TKA with a cementless 3D-printed metal-backed patella (Triathlon, Stryker). Endpoints to determine survivorship included loosening noted on radiographs or reoperation, according to Grau.
“Knee Society radiographic scores were recorded for each patient at the latest follow-up to evaluate for osseous integration and zonal lucency,” Grau said in his presentation at the American Association of Hip and Knee Surgeons Annual Meeting.
Grau and colleagues identified 150 cementless metal-backed patellas implanted between 2014 and 2016 in patients with a minimum of 2-year clinical and radiographic follow-up, while 78 patients had clinical outcome scores and 23 patients had appropriate radiographs at 5-year follow-up.
“Clinical outcome scores showed statistically significant differences in improvements at the 2-year follow-up,” Grau said. “At 5-year follow-up, there were statistically significant improvements that were maintained as compared to preoperative levels.”
Although three patients had a lucency at 2-year radiographic follow-up, Grau noted these lucencies were clinically insignificant, with 100% of patients experiencing osseous integration. He added two lucencies identified at 5-year radiographic follow-up also did not affect clinical outcomes.
“This 3D-printed cementless patella component shows excellent survivorship at 2- and 5-year follow-up,” the investigators wrote in their abstract.
“The summary of our results is that [there was] 99% overall survivorship of this implant,” Grau said. “We did have one failure due to prosthetic joint infection. If you consider only aseptic loosening as the mode of failure, survivorship was 100%.”
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Grau LC, et al. Paper 24. Presented at: American Association of Hip and Knee Surgeons Annual Meeting; Nov. 5-8, 2020; Dallas (hybrid meeting).
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