Which of the following has a male female ratio of 1:1?
A. Rheumatoid arthritis
C. Seronegative spondyloarthritis
D. Polymyalgia rheumatica
Correct answer : C. Seronegative spondyloarthritis
Bamboo spine in ankylosing spondylitis – a type of seronegative arthritis
Seronegative spondyloarthritis has a male : female ratio of 1:1.
Rheumatoid arthritis and Polymyalgia rheumatica are seen more commonly in females.
Gout is more common in males.
Ref: Davidson’s Principles and Practice of Medicine, 22nd Edition, p1060
Image credits : Stevenfruitsmaak via http://en.wikipedia.org/wiki/File:Bamboo_spine_ankylosing_spondylitis.jpg . Licensed under Creative Commons Attribution-Share Alike 3.0 Unported license.