You cannot fully extend the knee. Pain, swelling, and inflammation after acute injuries can all make knee range of motion difficult. If a patient comes to my office days after an injury and I canât straighten the knee, I get at least a little concerned. It can be a nonspecific finding, though.
Arthritis is inflammation of the joints (the points where bones meet) in one or more areas of the body. There are more than 100 different types of arthritis, all of which have different causes and treatment methods. The symptoms of arthritis usually appear gradually but they may also occur suddenly.ome forms of arthritis are caused by a reduction in the normal amount of this cartilage tissue. Osteoarthritis, one of the most common forms of arthritis, is caused by normal wear and tear throughout life; this natural breakdown of cartilage tissue can be exacerbated by an infection or injury to the joints.
Rheumatoid arthritis (RA) is an autoimmune disease where the body's immune system mistakenly attacks the synovium, a thin membrane that lines the joints. It causes chronic inflammation that leads to pain, swelling, and stiffness.