The spectrum of rheumatic diseases in Saudi Arabia.

The spectrum of rheumatic diseases seen in Saudi Arabia appeared to be broadly similar to that seen in the West although interesting differences were noted. Rheumatoid arthritis was the predominant inflammatory joint disease, but was less severe. Ankylosing spondylitis is probably rare among the Saudis. Brucellosis was an important cause of acute back pain. Osteoarthritis was characterized by frequent involvement of the knee while the hip was rarely involved. Environmental factors may be responsible for this disease pattern. Regional pain syndromes, associated with obesity, bad posture, and poor physical fitness were also frequent problems.