Sesamoid Position Change Over 2 Years After Distal Chevron Osteotomy for Moderate to Severe Hallux Valgus: A Prospective Cohort Study

Abstract

Background: Sesamoid position change after distal chevron osteotomy for moderate to severe hallux valgus is not well known in the literature. The objective of this study was to determine whether the sesamoid position changed over 2 years after distal chevron osteotomy for moderate to severe hallux valgus. Methods: Ninety-seven patients who underwent distal chevron osteotomy for moderate to severe hallux valgus were prospectively assessed for 2 years. There were 91 females, and the mean age was 54.9 (SD 10.9) years. The Self-Reported Foot and Ankle Score (SEFAS) was used for functional assessment. Foot pain was assessed by a 0-10 visual analog scale (VAS), and patient satisfaction by a 5-point Likert scale. Radiologically, hallux valgus angle (HVA), first-second intermetatarsal angle (IMA), distal metatarsal articular angle (DMAA), metatarsal head displacement, and sesamoid position by the AOFAS criteria were analyzed. Patients were classified according to the medial sesamoid position on the first postoperative weightbearing radiograph (1º-WB-Xray) into the reduced sesamoid group (66 patients) and nonreduced sesamoid group (31 patients). Results: All patients were assessed preoperatively and postoperatively at 1 month and 2 years. On the 1º-WB-Xray, IMA was significantly lower in the reduced group ( P = .038), but HVA ( P = .063) and DMAA ( P = .246) were not significantly different. At the final follow-up, no patients in the reduced group had sesamoid position change from 1º-WB-Xray, whereas 8 (25.8%) patients in the nonreduced group had change of their sesamoid positions. The SEFAS was not significantly different between groups preoperatively ( P = .386) or at 1 month postoperation ( P = .064). The final SEFAS, VAS pain, and satisfaction scores were significantly better in the reduced group, although the clinical significance of these changes remains unknown. Conclusion: A nonreduced position of the sesamoids obtained in surgery can cause their increased malposition over 2 postoperative years and statistically less functional outcomes. Level of Evidence: Level II, prospective cohort study.