Nottingham experience with the fixed bearing Infinity Total Ankle Replacement
H. Salem, M. Raglan, S. Dhar
Introduction: Total ankle arthroplasty (TAA) is increasingly used for treatment of end stage arthritis of the ankle; improvements continue to evolve in implant design and instrumentation. Recently there has been considerable excitement about fixed bearing TAA and we present our experience of the Infinity Total Ankle Arthroplasty, this is a fixed bearing 4th generation implant with improved instrumentation.
Methods: This is a retrospective study with prospective data collection, we I identified in our institution 92 (52 Male/40 Female) who had the an infinity Total ankle replacement during the period October 2016 -July 2019, The mean age 67.5(33-87), there were 43 right side and 49 left none of our patients had bilateral ankle replacements, the indication for the surgery was End stage Osteoarthritis in 83 patients and Rheumatoid arthritis in 9, All patients had follow up appointments at 6 weeks, 3,6 and 12 months and were required to fill in PROMS (MOXFQ and EQ5D) all had weight bearing X-rays as well.
Results: Improvement in Clinical outcome and PROM data was noted on follow up, radiological alignment was maintained, it was noted that 15(16%) patients had heterotopic ossification in the posterior capsule, lucency in the tibia implant was noted in 4 ankles and fibula erosion was noted in one, 2 implanted needed to be revised due to malpositioning and we had no infections in our short term series.
Conclusion: Our results show considerable improving in patient outcomes, particular short recovery time and improvement in mobility post operatively, and low complication rate, only 2 implants were revised and we attribute that the learning curve needed at the start of practice. This implant is fluoroscopically navigated allowing precise implantation with dedicated instrumentation and we feel this attributed to the low complication rate and good results in our short-term study.
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