The occurrence in males with rheumatoid arthritis or rheumatoid spondylitis of sacro-iliitis detectable by x-ray.
D001168:Arthritis; D001172:Arthritis, Rheumatoid / Q000706:statistics & numerical data*; D004194:Disease; D006801:Humans; D007592:Joint Diseases; D007596:Joints; D008297:Male; D012446:Sacroiliac Joint; D013122:Spinal Diseases; D013131:Spine; D013167:Spondylitis, Ankylosing; D014965:X-Rays
ARTHRITIS, RHEUMATOID/statistics; SACROILIAC JOINT/diseases; SPINE/diseases