Rheumatoid Arthritis
The most paralyzing and severe form of arthritis is rheumatoid arthritis, which is an autoimmune condition that affects almost every joint in the body including the knees. Although rheumatoid arthritis is a chronic condition, but it tends to come and go and might also vary in severity. [4]
Strained or sprained knee ligaments
A strained or sprained knee muscle or ligament occurs due to a sudden rotation or a blow to the knee. The symptoms might include swelling, difficulty to walk, and pain.