Mobile-bearing total ankle replacements associated with increased cyst formation
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Key takeaways:
- Results showed fixed-bearing and mobile-bearing total ankle replacements had a combined survivorship of 98%.
- Mobile-bearing total ankle replacements were associated with increased rates of cyst formation.
Mobile-bearing total ankle replacements were associated with an increased rate of cyst formation, according to results presented at the American Orthopaedic Foot & Ankle Society Annual Meeting.
Aleksandar Sevic, MBChB, associate professor and research associate at Trinity College Dublin, and colleagues randomly assigned 101 patients with end-stage ankle arthritis to receive either a fixed-bearing (n = 46; Salto Talaris, Smith & Nephew) or mobile-bearing (n = 55; Salto, Tornier) total ankle replacement.
Outcomes measured included the Foot Function Index, Revised Foot Function Index, SF-12 Survey and Total Ankle Joint Replacement Questionnaire. Sevic said standardized weight-bearing ankle radiographs were performed preoperatively and at 6 weeks, 6 months and 12 months postoperatively and at yearly intervals thereafter. Mean X-ray follow-up was 3 years.
According to Sevic, overall, patients had a survivorship rate of 98%. In addition, he noted there were no significant differences in patient-reported outcomes, improvements between preoperative and postoperative outcomes, alignment or range of motion between the two groups.
However, there was an increased incidence of subchondral cyst formation in the mobile-bearing group (49.1%) vs. the fixed-bearing group (n = 17.4%), according to the abstract. Sevic noted that this disparity was prevalent in both the tibial and talar components.
“Our study demonstrates higher than previously reported rates of mobile-bearing tibial component lucency and cyst formation,” Sevic said in his presentation.
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Sevic A, et al. Randomized prospective trial comparing the Salto Talaris fixed-bearing and Salto mobile-bearing total ankle replacement. Presented at: American Orthopaedic Foot & Ankle Society Annual Meeting; Sept. 11-14, 2024; Vancouver, British Columbia, Canada (hybrid meeting).
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