Cartilage is the firm, rubbery tissue that cushions your bones at the joints. It allows bones to glide over one another. When the cartilage breaks down and wears away, the bones rub together. This causes the pain, swelling, and stiffness of OA.
As OA worsens, bony spurs or extra bone may form around the joint. The ligaments and muscles around the joint may become weaker and stiffer.
Before age 55, OA occurs equally in men and women. After age 55, it is more common in women.
Other factors can also lead to OA.
OA tends to run in families.
Being overweight increases the risk of OA in the hip, knee, ankle, and foot joints. This is because extra weight causes more wear and tear.
Fractures or other joint injuries can lead to OA later in life. This includes injuries to the cartilage and ligaments in your joints.
Jobs that involve kneeling or squatting for more than an hour a day that involve lifting, climbing stairs, or walking increase the risk of OA.
Playing sports that involve direct impact on the joint (such as football), twisting (such as basketball or soccer), or throwing also increase the risk of OA.
Medical conditions that can lead to OA include:
Bleeding disorders that cause bleeding in the joint, such as hemophilia
Symptoms of OA usually appear in middle age. Almost everyone has some symptoms by age 70.
Pain and stiffness in the joints are the most common symptoms. The pain is often worse after exercise and when you put weight or pressure on the joint.
With OA, your joints may become stiffer and harder to move over time. You may notice a rubbing, grating, or crackling sound when you move the joint.
"Morning stiffness" refers to the pain and stiffness you feel when you first wake up in the morning. Stiffness due to OA usually lasts for 30 minutes or less. It improves after activity, allowing the joint to "warm up."
During the day, the pain may get worse when you are active and feel better when you are resting. As OA gets worse, you may have pain even when you are resting. And it may wake you up at night.
Some people might not have symptoms, even though x-rays show the changes of OA.
Exams and Tests
A physical exam can show:
Joint movement that causes a crackling (grating) sound, called crepitation
Joint swelling (bones around the joints may feel larger than normal)
Limited range of motion
Tenderness when the joint is pressed
Normal movement is often painful
Blood tests are not helpful in diagnosing OA.
An x-ray will likely show:
Loss of the joint space
Wearing down of the ends of the bone
OA cannot be cured. It will most likely get worse over time. However, your OA symptoms can be controlled.
You can have surgery, but other treatments can improve your pain and make your life much better. Although these treatments cannot make the arthritis go away, they can often delay surgery.
Most doctors recommend acetaminophen (such as Tylenol) first. It has fewer side effects than other drugs. (Do not take more then 3 grams (3,000mg) a day.)
If your pain continues, your doctor may recommend nonsteroidal anti-inflammatory drugs (NSAIDs). Types of NSAIDs include aspirin, ibuprofen, and naproxen.
Supplements that you may use include:
Pills such as glucosamine and chondroitin sulfate
Capsaicin skin cream to relieve pain
Staying active and getting exercise can maintain joint and overall movement. Ask your health care provider to recommend an exercise routine. Water exercises, such as swimming, are helpful.
Other lifestyle tips include:
Applying heat and cold to the joint
Eating healthy foods
Getting enough rest
Losing weight if you are overweight
Protecting your joints from injury
If the pain from OA gets worse, keeping up with activities may become more difficult or painful. Making changes around the home can help take stress off your joints to relieve some of the pain. If your work is causing stress in certain joints, you may need to adjust your work area or change work tasks.
Physical therapy can help improve muscle strength and the motion of stiff joints as well as your balance. If therapy does not make you feel better after 6 to 8 weeks, then it likely will not work at all.
Massage therapy may provide short-term pain relief. Make sure you work with a licensed massage therapist who is experienced in working on sensitive joints.
Splints and braces may help support weakened joints. Some types prevent the joint from moving. Others allow some movement. Use a brace only when your doctor or therapist recommends one. Using a brace the wrong way can cause joint damage, stiffness, and pain.
Acupuncture is a traditional Chinese treatment. It is thought that when acupuncture needles stimulate certain points on the body, chemicals that block pain are released. Acupuncture may provide short-term pain relief for OA.
S-adenosylmethionine (SAMe, pronounced "Sammy") is a manmade form of a natural chemical in the body. It may help reduce joint inflammation and pain.
Severe cases of OA might need surgery to replace or repair damaged joints. Options include:
Arthroscopic surgery to trim torn and damaged cartilage
Changing the alignment of a bone to relieve stress on the bone or joint (osteotomy)
Surgical fusion of bones, usually in the spine (arthrodesis)
Organizations that specialize in arthritis are good resources for more information on OA.
Your movement may become limited over time. Doing everyday activities, such as personal hygiene, household chores, or cooking may become a challenge. Treatment usually improves function.
When to Contact a Medical Professional
Call your health care provider if you have symptoms of OA that get worse.
Try not to overuse a painful joint at work or during activities. Maintain a normal body weight. Keep the muscles around your joints strong, especially the weight-bearing joints (knee, hip, ankle).
Bijlsma JW, Berenbaum F, Lafeber FP. Osteoarthritis: an update with relevance for clinical practice. Lancet. 2011;377:2115-2126.
Hochberg MC, Altman RD, April KT, et al. American College of Rheumatology 2012 recommendations for the use of nonpharmacologic and pharmacologic therapies in osteoarthritis of the hand, hip, and knee. Arthritis Care Res. 2012;4:465-474.
Nelson AE, Jordan JM. Clinical features of osteoarthritis. In: Firestein GS, Budd RC, Gabriel SE, et al., eds. Kelly’s Textbook of Rheumotology. 9th ed. Philadelphia, Pa: Elsevier Saunders; 2012:chap 99.
David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Bethanne Black, and the A.D.A.M. Editorial team.