If the degree of O-leg deformity is not particularly serious, there is usually no obvious sequelae after surgical correction; however, if the degree of deformity is serious, it usually increases the difficulty of the surgery and there may be sequelae after the surgery. Whether there will be after-effects after surgical correction of O-legs should be analyzed according to the severity of the O-leg deformity and post-operative recovery, and cannot be generalized. If the degree of O-leg deformity is not particularly serious and the postoperative recovery is good, there will usually be no sequelae; if the degree of deformity is serious, it will increase the difficulty of the surgery, which may lead to bilateral asymmetry, bleeding and infection, swelling of the legs, and so on. It is recommended that when patients undergo surgical correction of O-legs, they should choose doctors with professional technical level and rich clinical experience, which can make the postoperative correction effect more ideal and also avoid postoperative sequelae.