The Invision Talar Component as a Revision Total Ankle Arthroplasty Option: Analysis of Early Outcomes

Abstract

Category: Ankle; Other Introduction/Purpose: The Invision talar component was launched in 2018 as a revision total ankle arthroplasty (TAA) specific option geared towards avoiding further subsidence when poor talar bone stock is present. Due to the recency of the market- availability of the Invision, studies evaluating the efficacy of the implant, even in the short-term, are lacking. Thus, the purpose of this study was to present the early-term outcomes of a series of patients undergoing revision TAA with the use of the Invision talar component. Methods: This was a single-center, retrospective review of 28 patients undergoing revision TAA with the Invision talar component and Inbone II tibial component (Wright Medical; Memphis, Tennessee) performed between 2007 and 2022. Mean follow-up was 1.3 ± 0.93 years. Data on patient preoperative characteristics, postoperative complications, and survivorship were collected. The primary outcome measures were time to major complication, reoperation, and infection. Results: The most common concurrent procedures performed with revision TAA with the Invision talar component were gastrocnemius recession (n=14, 50%), subtalar arthrodesis (n=3, 10.7%) and cotton osteotomy (n = 1, 3.6%). The mean preoperative coronal deformity off the tibia was 4.07 ± 3.06 degrees for varus and 3.67 ± 4.36 degrees for valgus deformities, respectively, and postoperatively, was 1.67 ± 2.16 degrees for varus and 2.00 ± 3.48 degrees for valgus. The mean preoperative coronal plane deformity off the talus was 4.83 ± 6.68 degrees for varus and 4.22 ± 4.21 degrees for valgus, respectively, and postoperatively, was 1.23 ± 2.45 degrees for varus and 2.32 ± 3.93 degrees for valgus. The survivorship from any complication, major complication, reoperation, and infection is shown in Table 2. Conclusion: In a series of 28 patients undergoing revision TAA with the Invision talar component and Inbone II tibial component, we demonstrate a survivorship of 92.7% at 1-year follow up. The Invision appears to have a reasonable safety profile in this non- designer series. The implant compares favorably with others utilized in the revision TAA setting at the early-term, but further studies evaluating mid-and long-term outcomes are required to fully assess the efficacy of the Invision.