Experience in using three-dimensional preoperative planning and resections guides templates for scarf osteotomy in mild and moderate deformities of hallux valgus

Relevance: In the modern world, three-dimensional technologies are becoming more and more applicable. We propose to appreciate the possibilities of three-dimensional planning and printing when eliminating the deformation of Hallux valgus in order to increase the accuracy of chevron osteotomy. Purpose: to study and test the technology of three-dimensional printing with the creation of an individual guide template when performing an L-shaped modified chevron osteotomy with Hallux valgus deformation.Materials and methods: From 08.01.2017 to 05.01.2019, we operated on 53 patients (54 feet) with gradual and moderate deformity of Hallux valgus. Weperformed L-shaped modified chevron osteotomy in all cases. Patients were divided into 2 groups: a group with the use of computer technologies for three-dimensional planning and 3D printing of a guide template (group 1) and a control group (group 2). For evaluation, we conducted a questionnaire using the AOFAS, VASFA, MOXFQ scales before surgery, 6 months and 12 months after surgery and angle measurements HVIPA, HVA, 1-2 IMA, DMAA in 12 months after surgery.Results: Both methods resulted in improvements in AOFAS, VAS, MOXFQ scores at 6 and 12 months postoperatively. In comparison of group A and group B, there were no statistically significant differences in the questionnaire. There was no statistically significant difference in the assessment of angular indicators in comparison between groups. All groups showed improvements in all angular parameters, reflecting the successful elimination of the deformity. Conclusions: Based on the results of comparing both study groups, the use of 3D printing technologies in our study does not provide statistically significant advantages. However, their use allows implementing an individual approach in the design of the operation. Perhaps the method has potential in the surgeon's training system.