It has long been known that a certain amount of motion in the pelvic articulations is normal, and that an increased mobility of these articulations occurs physiologically during pregnancy. Little attention was given to this, however, until the publication of the article on pelvic articulations by Goldthwaite and Osgood in May, 1905. Albee, in 1909, stated that the sacro-iliac articulations are true joints having all the common joint structures, and are therefore subject to the same diseases and injuries as other joints. In view of these facts, it is remarkable that injuries and inflammation of these joints are not more frequently observed. This may be due to the fact that such diagnosis requires very careful roentgen-ray examination and interpretation.
This study was made on a series of ex-service men with so-called spine cases, and included very careful histories, thorough clinical and roentgen-ray examinations, and careful search to rule out infections
WOLDENBERG SC. BILATERAL SACRO-ILIAC OBLITERATION. JAMA. 1924;82(13):1027–1028. doi:10.1001/jama.1924.02650390017007