Abstract：Objective To evaluate the incidence, risk factors and prevention methods of proximal junctional kyphosis (PJK) after posterior osteotomy in adolescent spine kyphosis.Methods A total of 87 patients with adolescent spine kyphosis were performed posterior osteotomy in Xi′an Honghui Hospital between January 2005 and January 2009, with the average age of 14.8 years old (range from 11 to 20 years old). The change of the proximal junction angle was recorded before operation, 3 months after operation and the last follow up time.Results All patients were followed up for an average time of 6.4 years (range from 5 to 9 years). There were 27.6% patients (24/87) developed into PJK, and there was an increasing trend during the follow up time. There was 3 patients suffered from back pain, and one of them was performed revision. At the last followed time, the angles in PJK group and non-PJK group were 17.5°±2.6° and 7.1°±2.6°, respectively. The risk factors related to the PJK included age, proximal fusion range, pre-operative PJK angle, inappropriate global spine alignment and greater sagittal vertical axis change. There was a significant difference between these two groups(all P values＜0.05).Conclusions The incidence of PJK of posterior osteotomy in adolescent spine kyphosis is approxomately 27.6%. The age, proximal fusion range, pre-operative PJK angle, inappropriate global spine alignment and greater sagittal vertical axis change are significant risk factors for PJK.
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He Baorong, Xu Zhengwei, Yan Liang, Hao Dingjun, Liu Tuanjiang, Guo Hua. The clinical study of proximal junctional kyphosis after posterior osteotomy in adolescent spine kyphosis. Chinese Journal of Anatomy and Clinics, 2014, 19(4): 280-284.
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2014, Vol. 19 
