In the September 6, 2017 edition of The Journal of Bone & Joint Surgery, Odum et al. report findings from a matched cohort study that compared these two ankle procedures in terms of minor and major perioperative complications. To make more of an apples-to-apples comparison, the authors statistically matched 1,574 patients who underwent a TAA with an equal number of those who underwent fusion.
A major in-hospital complication (such as a pulmonary embolism or mechanical hardware problem) occurred in 8.5% of fusion patients and in 5.3% of TAA patients. After adjusting for case mix, Odum et al. found that ankle arthrodesis was 1.8 times more likely than TAA to be followed by a major complication. Regarding minor in-hospital complications (such as venous thrombosis or hematoma/seroma), the authors found a 29% lower risk of complications among arthrodesis patients compared to TAA patients, although that difference was not statistically significant (p = 0.14). Regardless of surgical procedure, patient age ≤67 years and the presence of multiple comorbidities were independently associated with a higher risk of a major complication.
A possible explanation for the lower in-hospital major-complication rate in TAA patients, say the authors, is that “TAA is more likely to be performed in younger, healthier patients with better bone quality and smaller deformities.”