Chinese Journal Of Clinical Anatomy ›› 2015, Vol. 33 ›› Issue (6): 637-640.doi: 10.13418/j.issn.1001-165x.2015.06.005

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The correlation between the inclination of S1 pedicles and morphology of auricular surface of sacrum

CHEN Zhen-hao 1,2, JIANG Xi 1,2, HU Wem-jun 1,2, HUANG Lin-xi 1,2, GUO Xiao-dan 1, YANG Xiang-qun 1   

  1. 1. Department of Anatomy,Second Military Medical University; 2. Company Seven of Clinic, Second Military Medical University, Shanghai 200433, China
  • Received:2014-11-28 Online:2015-11-25 Published:2015-12-18

Abstract:

Objective In order to provide anatomic basis for percutaneous fixation using sacroiliac screw by analyzing the correlation between the inclination of S1 pedicles and morphology of auricular surface of sacrum was investigated.    Methods    The relevant parameters of S1 pedicles and auricular surface were measured in 42 dry adult sacra respectively, then the correlation of the parameters was analyzed statistically. Results    The ratio (R1) of long axis of the upper part and the lower part was 0.86±0.15. According to the value of R1, the auricular surface was classified into two types, type L (R1>1) and f (R1<1). The inclination of S1 pedicles (θ) was (25.72±6.69)°, and the ratio R1 was correlated negatively with inclination θ. Conclusion  When the inclination of S1 pedicles is small, the auricular surface is type L, suggesting optimal angle of screw of S1 pedicle is smaller and the optimal point of surgical screws should be lower. When the inclination of S1 pedicles is larger, the auricular surface is type f, suggesting optimal angle of screw of S1 pedicle is larger and the optimal point of surgical screws should be higher.

Key words: Sacral auricular surface, S1 pedicle, Correlation, Fixation of sacroiliac joint