The most frequent symptoms in those exposed >6 yr were low back pain, painful knee,
elbow, and hip... Analysis of workers' complaints showed no specific pain or other symptom
that we could refer only to fluorosis...The only characteristic feature would be multiple-joint
involvement in the case of fluorosis. This would differentitate fluorosis from monoarticular
osteoarthritis (OA), but unfortunately not from multiple-joint osteoarthritis or rheumatoid
arthritis (RA).