Abstract
BackgroundAnkle osteoarthritis commonly involves sagittal malalignment with anterior translation of the talus relative to the tibia. Total ankle arthroplasty has become an increasingly popular treatment for patients with symptomatic ankle osteoarthritis. However, no comprehensive study has been conducted on the outcomes of total ankle arthroplasty for osteoarthritis with preoperative sagittal malalignment. The purpose of this study was to evaluate the effect of anterior translation of the talus on outcomes of three-component total ankle arthroplasty.MethodsOne hundred and four osteoarthritic ankles in 104 patients who underwent three-component total ankle arthroplasty were included in this study. The 104 ankles were divided into 2 groups: ankles with anteriorly translated talus (50 ankles), and ankles with non-translated talus (54 ankles). Clinical and radiographic outcomes were assessed in both groups. The mean follow-up duration was 42.8 ± 17.9 months (range, 24 to 95 months).ResultsForty-six (92%) of 50 ankles with anterior translation of the talus showed relocation of the talus within the mortise at 6 months, and 48 (96%) ankles were relocated at 12 months after total ankle arthroplasty. But, 2 (4%) ankles were not relocated until the final follow-up. The AOFAS scores, ankle range of motion, and radiographic outcomes showed no significant difference between the two groups at the final follow-up (p > 0.05 for each).ConclusionsIn majority of cases, the anteriorly translated talus in osteoarthritic ankles was restored to an anatomical position within 6 months after successful three-component total ankle arthroplasty. The clinical and radiographic outcomes in the osteoarthritic ankles with anteriorly translated talus group were comparable with those in non-translated talus group.
Highlights
Ankle osteoarthritis commonly involves sagittal malalignment with anterior translation of the talus relative to the tibia
Restoring the anatomical orientation of the tibia and talar component is considered vital to good long-term results of total ankle arthroplasty, [7,9,10] and proper positioning of the talar component is another important issue in total ankle arthroplasty [11,12]
Mean American Orthopaedic Foot and Ankle Society (AOFAS) ankle-hindfoot score improved from 46.2 points preoperatively to 93.0 points at the final followup in Group A and from 52.5 points preoperatively to 91.0 points at the final follow-up in Group B
Summary
Ankle osteoarthritis commonly involves sagittal malalignment with anterior translation of the talus relative to the tibia. One study [2] demonstrated that 46 (33%) of 138 osteoarthritic ankles had anterior translation of the talus Of these 46 ankles, 40 (87%) ankles showed relocation of the talus within the ankle mortise, 5 (11%) ankles showed unchanged alignment of the talus, and 1 ankle showed progression of translation of the talus at the average 54 month follow-up. They did not reported outcomes of total ankle arthroplasty for osteoarthritic ankles with and without anterior translation of the talus. A study was needed for the evaluation of the rate and the time of the relocation of the anteriorly translated talus into the ankle mortise after total ankle arthroplasty, and the effect of anterior translation of the talus on outcomes of total ankle arthroplasty
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