This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other Rheumatic Diseases, Subject name: Orthopaedics
Bamboo spine with sacroilitis - 
Select and explain. 
A. Anky losing spondylitis, B. RA, C. OA, D. Psoriatic arthritis
A: Anky losing spondylitis
Answer: A: Anky losing spondylitis 
Explanation: Ans. is 'a' i.e.. Ankylosing spondylitis Radiological features of ankvlosing spondylitiso Radiographic evidence of sacroiliac joint is the most consistent finding in ankylosing spondylitis and is crucial for diagnosis. The findings are :-Sclerosis of the articulating surfaces of SI jointsWidening of the sacroiliac joint spaceBony ankylosis of the sacroiliac jointsCalcification of the sacroiliac ligament and sacro-tuberous ligamentsEvidence of enthesopathy - calcification at the attachment of the muscles, tendons and ligaments, particularly around the pelvis and around the heel.o X-ray of lumbar spine may showr :-Squaring of vertebrae: The normal anterior concavity of the vertebral body is lost because of calcification of the anterior longitudinal ligament.Loss of the lumbar lordosis.Bridging 'osteophytes' (syndesmophytes)Bamboo spine appearance.