Abstract: Objective To explore clinical application of 3D printed osteotomy guide in mild to moderate hallux valgus correction. Methods Patients with mild to moderate hallux valgus surgery were randomly divided into two groups.30 feet in the experimental group were treated with osteotomy guide assisted orthopedic surgery，and 30 feet in the control group were treated with routine orthopedic surgery.The wound healing and postoperative weight-bearing position IMA were compared between the two groups，and the postoperative foot and ankle function was evaluated by American foot and ankle surgery first metatarsophalangeal joint scoring system（AOFAS）. Results All the wounds healed i after operation.there was no difference in the scores of IMA and AOFAS in the weight-bearing position between the two groups.The postoperative IMA of the experimental group was（5.18±0.82）° and the IMA of the control group was（6.34±0.75）°.There was significant difference between the two groups（P<0.05）.The AOFAS score of the experimental group was（89.05±5.16）and the control group was（82.84±5.02），there was significant difference between the two groups（P<0.05）. Conclusion 3D printed osteotomy guide plate in the treatment of mild to moderate hallux valgus operation can better correct the IMA，improve the function of foot after operation than the traditional operation method.

Key words: Hallux valgus, Osteotomy, 3D printing, Guide template