Pannus in Osteoarthritis versus in Rheumatoid Arthritis
Pannus is often linked to rheumatoid arthritis. However, it would also happen in people with osteoarthritis, even though the prevalence is not high. Several studies have shown that tissue samples from those with both medical conditions looked almost the same under a microscope. Nevertheless, there are still some differences. Compared to pannus in rheumatoid arthritis, pannus in osteoarthritis has:
– A bit fewer additional blood vessels
– Less inflamed cells caused by the immune system
– Fewer fibrous tissues
– Fewer overgrown synovial tissues
These features may be the reason why pannus in osteoarthritis is less likely to be damaging. [4]
Signs and Symptoms of Pannus in Rheumatoid Arthritis
Joint inflammation and pain are the two most common signs of pannus in rheumatoid arthritis. These problems may be caused by the damage of cartilage and bones in the joints. In addition, when the synovial tissues become thicker, excess fluid is accumulated, which would increase swelling and pain. Proteins and chemicals released from this fluid would worsen damage to joints. If left untreated, pannus in rheumatoid arthritis can even cause long-term joint deformity and reduced mobility. When pannus progresses, it may look like a tumor. [5]
