• Siyi Cai, Surong Hua, Qing Yuan, Jianxiong Shen, Jianguo Zhang, Hong Zhao, Lijuan Zhao, and Shugang Li.
• Department of Orthopedics, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing 100730, China.
• Zhonghua Yi Xue Za Zhi. 2014 May 6; 94 (17): 1338-41.

ObjectiveTo explore the correlation between the stability of lumbar vertebrate and pelvic indices of pelvic incidence (PI), lumber lordosis (LL), pelvic tilt (PT) and sacrum slope (SS).MethodsThe preoperative imaging data were analyzed retrospectively for 78 patients with lumbar disc protrusion. The values of PI, PT, SS and LL were measured and compared between lumbar vertebrate stability and lumbar vertebrate instability groups.ResultsNo inter-group statistical difference existed in PI, LL, PT or SS. The average PI of lumbar vertebrate instability group was higher than that of lumbar vertebrate stability group.In patients with L4/5 segmental lesion, SS of lumbar vertebrate instability group was higher than that of lumbar vertebrate stability group (38.7 ± 4.7)° vs (34.0 ± 6.6)°, P = 0.023. And PT in patients with L5/S1 segmental lesion was higher than those with L4/5 segmental lesion (17.5 ± 7.0 vs 14.9 ± 5.3, P = 0.027).ConclusionNo statistical inter-group difference exists in PI. However, higher SS and PT may be risk indicators of instability for L4/5 and L5/S1 segments respectively.

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