Abstract:

Objective　To Discuss the benefit of the three-dimensional visualization technique in preoperative planning of Chevron Osteotomy for treatment of hallux valgus.　Methods 　From January 2014 to December 2015, the 3D visualization preoperative planning technique was applied to 20 admitted patients aged 48-72 years old with mild to moderate hallux valgus.  The image processing software M3d was performed to analyze the images obtained from 3D spiral CT with 0.625 mm thin slices, generate the hallux valgus model, simulate the osteotomy, measure hallux valgus angle (HVA) and 1st-2nd intermetatarsal angle (IMA), and compare measurements at different osteotomy angles.　Results　With the guidance of the preoperative planning made through digital reconstruction model of hallux valgus and osteotomy simulation, the imaging findings after osteotomy correction highly agreed with the one made from 3D virtual surgery.  AOFAS scores were significantly increased, as well as patient satisfaction.　Conclusions　The 3D foot weight-bearing reconstruction model for hallux valgus patient clearly shows the position change of the first metatarsal column in a 3D space.  It also provides a quantitative basis for Chevron osteotomy surface design and 3D post-treatment measurement of the first metatarsal head. Hallux valgus correction treatment should be designed to accommodate individual differences, so that the foot shape looks better and weight-bearing function works better to improve patient satisfaction after Chevron osteotomy.

Key words: The Chevron osteotomy for hallux valgus, Hallux , valgu, Three-dimensional reconstruction