Comparison of triplanar chevron osteotomy with chevron osteotomy in hallux valgus treatment for the prevention of transfer metatarsalgia

Abstract

Hallux valgus (HV) is often accompanied by metatarsalgia. This study compared the radiological and clinical outcomes of new triplanar chevron osteotomy (TCO) and chevron osteotomy (CO) in the treatment of HV, especially for patients with plantar callosities and metatarsalgia. In this retrospective analysis, 90 patients (45 patients per group) with mild to moderate HV and plantar callosities were treated with TCO and CO from July 2020 to January 2022. In both procedures, the apex was located in the center of the head of the first metatarsal bone, and the CO was oriented towards the fourth MTPJ at a 60° angle. Plantar-oblique chevron osteotomy was defined as chevron osteotomy and a 20° plantar tilt; TCO was defined as plantar-oblique chevron osteotomy-based metatarsal osteotomy with a 10° tilt towards the metatarsal head. Primary outcome measures included preoperative and postoperative hallux valgus angle, 1 to 2 intermetatarsal angle (IMA), distal metatarsal articular angle (DMAA), first metatarsal length (FML), and second metatarsal head height X-ray images; clinical measurements, including visual analogue scale and American Orthopaedic Foot & Ankle Society (AOFAS) scores; changes in callosity grade and area; and changes in the number of people with metatarsalgia. Secondary outcomes included complications, recurrence rates, and cosmetic appearance. The hallux valgus angle, IMA, and DMAA were significantly lower after surgery (P  < .001) in all patients. In the TCO group, the mean FML and second metatarsal head height increased significantly postoperatively (P < .001). The AOFAS and visual analogue scale scores improved postoperatively in both groups (P < .001). All patients experienced satisfactory pain relief and acceptable cosmesis. The plantar callosity areas were smaller postoperatively in both the TCO and CO groups, but the change in the area (Δarea) in the TCO group significantly differed from that in the CO group (P < .001). The number of postoperative patients with metatarsalgia and the plantar callosity grade were both significantly lower in the TCO group than in the CO group after osteotomy (P < .05). TCO prevents dorsal shift of the metatarsal head and preserves and even increases FML, thereby preventing future metatarsalgia in patients. Therefore, compared with CO, TCO has better orthopedic outcomes and is an effective method for treating mild to moderate HV and preventing transfer metatarsalgia.