What Is Osteoarthritis?
Osteoarthritis is the most common type of arthritis. People usually have joint pain and stiffness. Unlike rheumatoid arthritis, it does not affect skin tissue, the lungs, eyes, or blood vessels.
In osteoarthritis, cartilage—the hard, slippery tissue that protects the ends of bones where they meet to form a joint—wears away. The bones rub together, causing pain, swelling, and loss of motion. Over time, the joint also may lose its normal shape. Bone spurs—small deposits of bone—may grow on the edges of the joint. Also, bits of bone or cartilage can break off inside, causing more pain and damage.
Where does osteoarthritis occur?
Hands—Osteoarthritis of the hands seems to run in families. Women are more likely than men to have hand involvement. For most, it develops after menopause. Small, bony knobs may appear on the end joints (those closest to the nails) of the fingers. Fingers can become enlarged and gnarled, and may ache or be stiff and numb. The base of the thumb joint also is commonly affected.
Knees—Symptoms include stiffness, swelling, and pain. This makes it hard to walk, climb, and get in and out of chairs and bathtubs.
Hips—There is pain and stiffness of the joint itself. But sometimes pain is felt in the groin, inner thigh, buttocks, or even the knees. Osteoarthritis of the hip may limit moving and bending. This can make dressing or other daily activities a challenge.
Spine—There is stiffness and pain in the neck or lower back. In some cases, arthritis-related changes in the spine can put pressure on the nerves where they exit the spinal column. This results in weakness, tingling, or numbness of the arms and legs. In severe cases, bladder and bowel function can be affected.