First Metatarsal Pronation Correction After Fourth-Generation Percutaneous Transverse Osteotomy for Hallux Valgus.

BACKGROUND

There is increasing interest in the role of pronation as part of the deformity correction in hallux valgus (HV) especially with the advent of weightbearing computed tomography (WBCT) and percutaneous surgical techniques. This study aimed to assess the coronal rotation of the first metatarsal before and after percutaneous distal transverse osteotomy (Metaphyseal Extra-Articular Transverse and Akin Osteotomy [META]) using WBCT and to correlate these findings with clinical outcome scores.

METHODS

A retrospective analysis of prospectively collected data from a single center of patients who underwent WBCT both before and after percutaneous distal transverse osteotomy for hallux valgus correction. The primary outcome was change in pronation on radiographic parameters; Hallux valgus angle, intermetatarsal angle, metatarsal pronation angle, alpha angle, sesamoid rotation angle, arthritis, and sesamoid position were assessed using coronal WBCT images. Secondary outcomes included pre- and postoperative clinical outcomes, including the Manchester-Oxford Foot Questionnaire (MOXFQ), EuroQol-5 dimensions-5 levels (EQ-5D-5L), visual analog scale (VAS) and complication rates.

RESULTS

Fifty-one feet from 34 patients (32 female, 2 male, mean age 60.3 ± 10.2 years) underwent META. Radiographic data were available for 94.4% of feet with a mean follow-up of 12.1 ± 3.2 months. There was a significant improvement across all radiographic parameters including pronation correction ( < .05). There was also a significant improvement in clinical foot function for all MOXFQ domains, EQ-5D-5L, and VAS pain outcomes ( < .05). The complication rate was 1.9%. There was no significant correlation of postoperative outcomes with radiographic pronation parameters. Regression analysis did not identify any radiographic or clinical variables that predicted change in the MOXFQ Index domain score.

CONCLUSION

Percutaneous distal transverse osteotomy for hallux valgus deformity can significantly correct coronal plane pronation and improve patient-reported outcomes, although correction of pronation was not significantly correlated with clinical improvement.