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Minimally invasive UKA survivorship, revision rates similar to previous studies
The survivorship and revision rates of a minimally invasive unicompartmental knee arthroplasty procedure were similar to those found in other published reports, according to study results.
Researchers examined 517 consecutive fixed-bearing, cemented unicompartmental knee arthroplasties (UKAs) performed through a minimally invasive surgical incision involving the medial compartment of the knee. Mean follow-up was 4.9 years.
Kaplan-Meier survivorship analysis showed a survival rate of 97% at 2 years, 93% at 4 years and 92% at 6 years, with the rate of decrease in survivorship remaining constant over time, according to the researchers.
Within 2 years of the UKA, revision was needed in 15 knees, and an additional 16 knees were revised by 6 years. The researchers found revisions for infection and tibial collapse/fracture occurred early, whereas revisions for other reasons tended to occur across the entire follow-up period. The researchers also found that 43 knees failed and required a revision procedure, with 44% of the failures caused by aseptic loosening.
“Our analysis of survivorship and the mechanism of failure with this fixed-bearing unicompartmental component are in accordance with reports from the orthopedic literature and implant registries,” the researchers concluded.
Disclosures: Hamilton is a consultant for DePuy and received research support from DePuy and Biomet. Hopper also received research support from DePuy.