Recurrence rates after surgical treatment for hallux valgus (bunion) range from 4% to 25%. Findings from a study by Park and Lee in the July 19, 2017 edition of The Journal of Bone & Joint Surgery suggest that non-weight-bearing radiographs taken immediately after surgery can provide a good estimate of the risk of recurrence.
The study analyzed proximal chevron osteotomies performed on 117 feet. At an average follow-up of two years, the hallux valgus recurrence rate was 17%. (Recurrence was defined as a hallux valgus angle [HVA] of ≥20°.)
Bunions were 28 times more likely to recur when the postoperative HVA was ≥8° than when the HVA was <8°. The HVA continued to widen over time in patients with recurrent bunions, but stabilized at six months in those without recurrence. An immediate postoperative sesamoid position of grade 4 or greater was also significantly associated with recurrence.
If future studies confirm their results, the authors believe that such data could be used “to suggest intraoperative guidelines for satisfactory correction of radiographic parameters,” and thus help surgeons minimize the risk of hallux valgus recurrence. Commentator Jakup Midjord, MD concurs, noting that non-weight-bearing radiographs can be “closely related to intraoperative radiographs, so we can modify correction as needed in the operating room.”