Chinese Journal Of Clinical Anatomy ›› 2016, Vol. 34 ›› Issue (6): 630-634.doi: 10.13418/j.issn.1001-165x.2016.06.007

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The types of the sacroiliac joint on the pelvic anteroposterior radiography and its clinical implications

YANG Xian-wen1, ZHANG Shao-qun2, CHEN Zu-jiang2, LI Yi-kai2   

  1. 1.Armed Police Corps Hospital of Guangdong Province, Guangzhou 510507;  2. College of Traditional Chinese Medicine,Southern Medical University, Guangzhou 510515, China
  • Received:2015-10-12 Online:2016-11-25 Published:2016-12-20
  • Contact: LI Yi-kai, E-mail:liyikai88@sina.com

Abstract:

Objective To explore the radiological types of the sacroiliac joint on the anteroposterior radiography of the pelvis, providing guidance for the clinicians to know more about the sacroiliac joint.Methods 950 cases (male and female account for half respectively) of normal sacroiliac joints were observed on the anteroposterior radiography of the pelvisand then the radiological types of the sacroiliac joint were classified according to the number of the sacroiliac spaces and the characteristics of their shape. Result  (1) The normal sacroiliac joints on the anteroposterior radiography of the pelvis can be classified to three types: ①8.8% of males (42 cases) and 25.7% of females (122 cases) were classified as type I, which was called single gap on both sides type;②79.2% of males(376 cases) and 46.7% of females(222 cases) were classified as type II, which was called double gaps on both sides type;③12% of males(57 cases) and 27.6% of females(131 cases) were classified as type III, which was called one side single gap and the other side double gaps type;(2) Double gaps on both sides type can be particularly classified to four subtypes:①0.8% of males(3 cases) and 6.6% of females(15 cases) were classified as 2 double gaps type;②56.4% of males(212 cases) and 69.8% of females(155 cases) were classified as 12 double gaps type;③2.1% of males(8 cases) and 1.8% of females(4 cases) were classified as 21 double gaps type;④41.8% of males(157 cases) and 19.8% of females(44 cases) were classified as 121 double gaps type;(3) One side single gap and the other side double gaps type can also be classified to two subtypes:①26.3% of males(15 cases) and 49.6% of females(65 cases) were classified as Single gap on left and double gaps on right type;②73.7% of males(42 cases) and 50.4% of females(66 cases) were classified as double gaps on left and single gap on right type. Conclusions (1) The most common type of the normal sacroiliac joints on the anteroposterior radiography of the pelvis is the double gaps on both sides type, in which the largest proportion of all four subtypes is the “12” double gaps type, but the constituent ratio of each type on gender has a significant variation.

Key words: Sacroiliac joint, Anteroposterior radiography of the pelvis, Radiology's types, Clinical significance