Osteitis condensans ilii and its differentiation from ankylosing spondylitis.

Sicard, Gally, and Haguenau (1926) first described cases of the condition now known as osteitis condensans ilii. The name of the disease was introduced by Bairsony and Polgair (1928), who recorded fifteen cases; they considered it to be a specific clinical entity, the lesion being found on radiological examination of the lumbo-sacral area, and the essential feature being dense sclerosis in the iliac bone, adjacent to the lower part of the sacroiliac joint.