Purpose Cubitus varus deformity in the pediatric population is an infrequent but clinically important disease to orthopedic surgeons. Since these patient populations are different in many respects, we sought out to investigate the rates of loss of correction over time as well as the factors associated with loss of correction in pediatric patients undergoing osteotomy for treatment of cubitus varus deformity.
Methods Between 2008-7 and 2017-7, we treated 30 cases of cubital varus had underwent the the osteotomy. We compared preoperative and postoperative clinical and imaging parameters (H-cobb angle,Baumman angle) for all patients. Postoperative evaluation was performed by telephone interview.
Results In our study,there were 30 patients,included 17 males and 13 females.the mean age was 75 months old.In the first follow-up,Approximately 80 % of patients had a loss of correction of H-cobb，and 83% of patients at the second follow-up. The Baumann angle also had a loss of correction,about 57% was lost at the first follow-up,and 43% was lost at the second follow-up. The average interval between the first follow-up and the second follow-up was 24 days ，The H-cobb angle mean loss was 2.4°.There was a statistically significant difference between the H-cobb angle measured before surgery and the angle measured after surgery (p <0.05). There were significant differences between the two angles. There was no statistically significant difference between the H-cobb angle measured at the third postoperative period and the contralateral healthy elbow H-cobb angle. There was a statistically significant difference between the Baumann angle measured before surgery and the angle measured after surgery (p <0.05). The Baumann angle measured in the second and third postoperative periods was significantly different from that of the contralateral healthy elbow joint. According to the survival curve analysis, we can see that the median survival time of the H-cobb angle and the Baumann angle is 27 and 34 months.
Conclusions The postoperative angle loss will last for a period of time, which mainly occurs during the first and second follow-up period . Therefore, it is important to pay attention to the follow-up of the patient for a period of time after the operation, and take measures to avoid rapid angle loss. Angle loss was significantly reduced after the third follow-up. Further study is needed on this subgroup of patients with cubitus varus given the differences in strategies needed to correct and maintain their deformity correction.