Prassopoulos P K, Faflia C P, Voloudaki A E, Gourtsoyiannis N C
Department of Radiology, University Hospital, Medical School of Crete, Heraklion, Greece.
J Comput Assist Tomogr. 1999 Mar-Apr;23(2):323-7. doi: 10.1097/00004728-199903000-00029.
The purpose of this work was to examine the type and prevalence of anatomical variants of the sacroiliac joints (SJs) in patients without SJ disease on CT examinations. The study comprised 534 consecutive patients undergoing pelvic CT with various indications not related to diseases that could involve the SJ. Images printed on bone window settings were evaluated with reference to any deviation from the usual appearance of the SJ. Physical data and history of low back pain were recorded in each patient. Six types of anatomical variants were observed: accessory joints in 102 patients (19.1%), "iliosacral complex" in 31 (5.8%), bipartite iliac bony plate in 22 (4.1%), crescent-like iliac bony plate in 20 (3.7%), semicircular defects at the sacral or iliac side in 16 (3%), and ossification centers in 3 patients (0.6%). Accessory joints were more common in obese than in normal-weight individuals (p < 0.05) and in older than younger (<60 years) patients (p < 0.001) and presented degenerative alterations especially in patients with episodes of low back pain. Three of these variants (iliosacral complex, bipartite iliac bony plate, and crescent-like iliac bony plate) had higher incidence in women than in men (p < 0.05) and were not associated with degenerative changes. Knowledge of the normal variations in the SJ appearance broadens the understanding of SJ anatomy, facilitating image interpretation.
这项研究的目的是通过CT检查，研究骶髂关节（SJs）解剖变异的类型和发生率，这些患者没有骶髂关节疾病。该研究纳入了534例因各种与骶髂关节无关的适应症而接受骨盆CT检查的连续患者。根据骶髂关节与正常外观的任何偏差，对骨窗设置下打印的图像进行评估。记录每位患者的身体数据和腰痛病史。观察到六种解剖变异类型：102例患者（19.1%）出现副关节，31例（5.8%）出现“髂骶复合体”，22例（4.1%）出现二分髂骨板，20例（3.7%）出现新月形髂骨板，16例（3%）在骶骨或髂骨侧出现半圆形缺损，3例患者（0.6%）出现骨化中心。副关节在肥胖患者中比正常体重个体更常见（p<0.05），在老年患者中比年轻患者（<60岁）更常见（p<0.001），并且尤其在有腰痛发作的患者中出现退行性改变。其中三种变异（髂骶复合体、二分髂骨板和新月形髂骨板）在女性中的发生率高于男性（p<0.05），且与退行性改变无关。了解骶髂关节外观的正常变异有助于拓宽对骶髂关节解剖结构的认识，便于图像解读。
