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What is osteoarthritis?
Osteoarthritis (OA) is a form of arthritis that features the breakdown and eventual loss of the cartilage of one or more joints. Cartilage is a protein substance that serves as a "cushion" between the bones of the joints. Among the over 100 different types of arthritis conditions, osteoarthritis is the most common joint disease.
OA occurs more frequently as we age. Before age 45, osteoarthritis occurs more frequently in males. After 55 years of age, it occurs more frequently in females. In the United States, all races appear equally affected. Hand osteoarthritis, hip osteoarthritis, and knee osteoarthritis are much more common in seniors than in younger people. A higher incidence of osteoarthritis exists in the Japanese population, while South-African blacks, East Indians, and Southern Chinese have lower rates.
Osteoarthritis is abbreviated as OA or referred to as degenerative arthritis or degenerative joint disease (DJD).
Osteoarthritis commonly affects:
- the hands,
- spine, and
- large weight-bearing joints, such as the hips and knees.
Osteoarthritis usually has no known cause and is referred to as primary osteoarthritis. When the cause of the osteoarthritis is known, the condition is referred to as secondary OA.
What causes osteoarthritis?
Primary (idiopathic) osteoarthritis, OA not resulting from injury or disease, is partly a result of natural aging of the joint.
- With aging, the water content of the cartilage increases, and the protein makeup of cartilage degenerates as a function of biological processes.
- Eventually, cartilage begins to degenerate by flaking or forming tiny crevasses.
- In advanced osteoarthritis, there is a total loss of the cartilage cushion between the bones of the joints.
- Repetitive use of worn joints over the years can mechanically irritate and inflame the cartilage, causing joint pain and swelling.
- Loss of the cartilage cushion causes friction between the bones, leading to pain and limitation of joint mobility.
- Inflammation of the cartilage can also stimulate new bone outgrowths (spurs, also referred to as osteophytes) to form around the joints.
- Osteoarthritis occasionally can develop in multiple members of the same family, implying a hereditary (genetic) basis for this condition.
- Osteoarthritis is therefore felt to be a result of a combination of each of the above factors that ultimately lead to a narrowing of the cartilage in the affected joint.
Secondary osteoarthritis is a form of osteoarthritis that is caused by another disease or condition. Conditions that can lead to secondary osteoarthritis include:
- repeated trauma or surgery to the joint structures,
- abnormal joints at birth (congenital abnormalities),
- hemochromatosis, and
- other hormone disorders.
Obesity causes osteoarthritis by increasing the mechanical stress on the joint and therefore on the cartilage. Next to aging, obesity is the most significant risk factor for osteoarthritis of the knees. The early development of osteoarthritis of the knees among weightlifters is believed to be in part due to their high body weight. Repeated trauma to joint tissues (ligaments, bones, and cartilage) is believed to lead to early osteoarthritis of the knees in soccer players and army military personnel. Interestingly, health studies have not found an increased risk of osteoarthritis in long-distance runners.
Crystal deposits in the cartilage can cause cartilage degeneration and osteoarthritis. Uric acid crystals cause arthritis in gout, while calcium pyrophosphate crystals cause arthritis in pseudogout.
Some people are born with abnormally formed joints (congenital abnormalities) that are vulnerable to mechanical wear, causing early degeneration and loss of joint cartilage. Osteoarthritis of the hip joints is commonly related to structural abnormalities of these joints that had been present since birth.
Hormone disturbances, such as diabetes and growth hormone disorders, are also associated with early cartilage wear and secondary osteoarthritis.
IMAGESSee a medical illustration of osteoarthritis plus our entire medical gallery of human anatomy and physiology See Images
What are the symptoms of osteoarthritis?
Osteoarthritis is a disease that is isolated to the cartilage of the joints. Unlike many other forms of arthritis that are systemic illnesses (conditions that affect multiple areas of the body apart from the joints), such as rheumatoid arthritis and systemic lupus, osteoarthritis does not affect other organs of the body.
The most common symptom of osteoarthritis is pain in the affected joint(s) after repetitive use. This can lead to:
- knee pain,
- hip pain,
- finger joint pain,
- ankle pain,
- foot pain,
- wrist pain, and
- shoulder pain with loss of range of motion and function.
Joint pain of osteoarthritis is usually worse later in the day. There can be:
- warmth, and
- creaking of the affected joints.
Pain and stiffness of the joints can also occur after long periods of inactivity (for example, sitting in a theater). In severe osteoarthritis, complete loss of the cartilage cushion causes friction between bones, causing pain even at rest or pain with limited motion.
Symptoms of osteoarthritis vary from person to person. Symptoms debilitate some of those who are affected. On the other hand, others may have remarkably few symptoms despite dramatic degeneration of the joints apparent on X-rays. Osteoarthritis can cause a joint deformity as asymmetric cartilage loss in the joint leads to malalignment of a digit or limb. Symptoms also can be intermittent. It is not unusual for people with osteoarthritis of the finger joints of the hands and knees to have years of pain-free intervals between symptoms. Osteoarthritis can lead to creaking (crepitus) of the joint, especially when severe cartilage loss leaves a joint "bone-on-bone" with little cartilage cushioning the joint during movement.
Osteoarthritis of the knees is often associated with excess upper body weight, obesity, or a history of repeated injury and/or joint surgery. Progressive cartilage degeneration of the knee joints can lead to deformity and outward curvature of the knees, which is referred to as being "bowlegged." People with osteoarthritis of the weight-bearing joints (such as the knees) can develop a limp. The limping during load-bearing can worsen as more cartilage degenerates. In some individuals, the pain, limping, and joint dysfunction may not respond to medications or other conservative measures. Therefore, severe osteoarthritis of the knees is one of the most common reasons for total knee replacement medical procedures in the United States.
Osteoarthritis of the cervical spine or lumbar spine causes pain in the neck or low back. Bony spurs, called osteophytes, that form along the arthritic spine can irritate spinal nerves, causing severe pain that can radiate from the spine as well as numbness and tingling in the affected parts of the body.
Osteoarthritis causes the formation of hard, bony enlargements of the small joints of the fingers. Classic bony enlargement of the small joint at the end of the fingers is called a Heberden's node, named after a famous British doctor. The bony deformity is a result of the bone spurs from the osteoarthritis in that joint. Another common bony knob (node) occurs at the middle joint of the fingers in many patients with osteoarthritis and is called a Bouchard's node. Dr. Bouchard was a famous French doctor who also studied arthritis patients in the late 1800s. Heberden's and Bouchard's nodes may not be painful, but they are often associated with the limitation of motion of the joint. The characteristic appearances of these finger nodes can help diagnose osteoarthritis. Osteoarthritis of the joint at the base of the big toe of the foot leads to the formation of a bunion. Osteoarthritis of the fingers and the toes may have a genetic basis and can be found in numerous female members of some families.
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There is no blood test for the diagnosis of osteoarthritis. Blood tests are performed to exclude diseases that can cause secondary osteoarthritis, as well as to exclude other arthritis conditions that can mimic osteoarthritis.
- X-rays of the affected joints can be used to diagnose osteoarthritis. The common X-ray findings of osteoarthritis include loss of joint cartilage, narrowing of the joint space between adjacent bones, and bone spur formation. Simple X-ray testing can also be very helpful to exclude other causes of pain in a particular joint as well as assist the decision-making as to when surgical intervention might be considered. MRI is rarely necessary to make the diagnosis of osteoarthritis.
- Arthrocentesis is a procedure to remove joint fluid that is often performed in a health care professional's office. During arthrocentesis, a sterile needle is used to remove joint fluid for analysis. Joint fluid analysis is useful in excluding gout, infection, and other causes of arthritis. Removal of joint fluid and injection of corticosteroids into the joints during arthrocentesis can help relieve pain, swelling, and inflammation.
- Arthroscopy is a surgical technique whereby a doctor inserts a viewing tube into the joint space. Abnormalities of and damage to the cartilage and ligaments can be detected and sometimes repaired through the arthroscope. If successful, patients can recover from arthroscopic surgery much more quickly than from open-joint surgery.
- Finally, a careful analysis of the location, duration, and character of the joint symptoms and the appearance of the joints helps the doctor in diagnosing osteoarthritis. Bony enlargement of the joints from spur formations is characteristic of osteoarthritis. Therefore, the presence of Heberden's nodes, Bouchard's nodes, and bunions of the feet can indicate to the doctor a diagnosis of osteoarthritis.
Osteoarthritis treatments and home remedies
Aside from weight reduction and avoiding activities that exert excessive stress on the joint cartilage, there is no specific medical treatment to halt cartilage degeneration or repair damaged cartilage in osteoarthritis. There is no medication to stop osteoarthritis (disease-modifying medication). The goal of treatment in osteoarthritis is to reduce joint pain and inflammation while improving and maintaining joint function.
Some people with osteoarthritis have minimal or no pain and may not need treatment. Others may benefit from conservative measures such as:
- diet control with weight loss,
- physical therapy and/or occupational therapy, and
- mechanical support devices, such as knee braces.
These measures are particularly important when large, weight-bearing joints are involved, such as the hips or knees. Even modest weight reduction can help to decrease symptoms of osteoarthritis of the large joints, such as the knees and hips. Medications are used to complement the physical measures described above. Medication may be used topically, taken orally, or injected into the joints to decrease joint inflammation and pain. When conservative measures fail to control pain and improve joint function, surgery can be considered.
Resting sore joints decreases stress on the joints and relieves pain and swelling. Patients are asked to simply decrease the intensity and/or frequency of the activities that consistently cause joint pain.
Physical activity usually does not aggravate osteoarthritis when performed at levels that do not cause joint pain. Exercise is helpful for the relief of symptoms of osteoarthritis in several ways, including strengthening the muscular support around the joints. It also prevents the joints from "freezing up" and improves and maintains joint mobility. Finally, it promotes weight reduction and endurance. Applying local heat before and cold packs after exercise can help relieve pain and inflammation. Swimming is particularly well suited for patients with osteoarthritis because it allows patients to exercise with minimal impact stress on the joints.
Other popular exercises include:
Aside from physical therapy, physical therapists can provide support devices, such as splints, canes, walkers, and braces. These medical devices can help reduce stress on the joints. Shoe inserts can help reduce strain on the feet, knees, and back. Occupational therapy can assess the demands of daily activities and suggest additional devices that may help people at work or home. Finger splints can support individual joints of the fingers.
The following measures can help ease hand symptoms:
- Paraffin wax dips
- Warm water soaks
- Nighttime cotton gloves
Transcutaneous electrical nerve stimulation (TENS) has been shown in studies to relieve pain in some cases of osteoarthritis. TENS uses electrode patches attached to a small, battery-operated device. The TENS unit sends an electric current to your nerves to override pain signals. It can help with short-term pain and long-term pain. In some patients, it decreases the need for pain medications.
Spine symptoms can improve with a neck collar, lumbar corset, or a firm mattress, depending on what areas are involved.
While many people report that acupuncture is helpful for pain, studies have not always confirmed the benefit.
For persisting pain of severe osteoarthritis of the knee that does not respond to weight reduction, exercise, or medications, a series of injections of hyaluronic acid (Synvisc, Hyalgan, Orthovisc, Supartz, Euflexxa, and others) into the joint can sometimes be helpful, especially if surgery is not being considered. These products seem to work by temporarily restoring the thickness of the joint fluid, allowing better joint lubrication and impact capability, and perhaps by directly affecting pain receptors.
Surgery is generally reserved for those patients with osteoarthritis that is particularly severe and unresponsive to conservative treatments. Arthroscopy, discussed above, can be helpful when cartilage tears or loose pieces of cartilage are suspected. Osteotomy is a bone-removal procedure that can help realign some of the deformities in selected patients, usually those with certain forms of knee disease. Severely degenerated joints may be best treated by fusion (arthrodesis) or replacement with an artificial joint (joint replacement, or arthroplasty). Total hip and total knee replacements are now commonly performed in community hospitals throughout the United States. These can bring dramatic pain relief and improved function.
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Medications for osteoarthritis
In many people with osteoarthritis, mild pain relievers such as aspirin and acetaminophen (Tylenol) may be sufficient treatment. Studies have shown that acetaminophen given in adequate doses for pain relief can often be equally as effective as prescription anti-inflammatory medications in relieving pain in osteoarthritis of the knees. Since acetaminophen has fewer gastrointestinal side effects than NSAIDS (see below), especially among elderly people, acetaminophen is generally the preferred initial drug given for osteoarthritis. Medicine to relax muscles in spasms might also be given temporarily. Pain-relieving creams applied to the skin over the joints can provide relief from minor arthritis pain.
Examples of pain-relieving creams include:
- capsaicin (ArthriCare, Zostrix),
- salicin (Aspercreme),
- methyl salicylate (Ben-Gay, Icy Hot), and
- menthol (Flexall).
Topical treatments applied to the skin surface surrounding the joint affected by osteoarthritis include:
- an anti-inflammatory lotion,
- diclofenac (Voltaren Gel, Pennsaid), and
- diclofenac patch (Flector Patch).
Each of these provides some relief from osteoarthritis pain.
Non-steroidal anti-inflammatory drugs (NSAIDs) are medications that are used to reduce pain and inflammation in the joints. Examples of NSAIDs include:
- aspirin (Ecotrin),
- ibuprofen (Motrin),
- nabumetone (Relafen), and
- naproxen (Naprosyn).
It is sometimes possible to use NSAIDs temporarily and then discontinue them for periods without recurrent symptoms, thereby decreasing the risk of side effects.
The most common side effects of NSAIDs involve gastrointestinal distress, such as stomach upset, cramping diarrhea, ulcers, and even bleeding. The risk of these and other side effects increases in the elderly. Newer NSAIDs called COX-2 inhibitors have been designed that have less toxicity to the stomach and bowels. Because osteoarthritis symptoms vary and can be intermittent, these medicines might be given only when joint pains occur or before activities that have traditionally brought on symptoms.
Duloxetine (Cymbalta) is FDA-approved for the treatment of chronic musculoskeletal pain. This includes osteoarthritis. Duloxetine belongs to the antidepressant class of medications. For pain, it is thought to work by changing the levels of the neurotransmitters responsible for pain perception.
Some studies, but not all, have suggested that alternative treatment with the food supplements glucosamine and chondroitin can relieve symptoms of pain and stiffness for some people with osteoarthritis. These supplements are available in pharmacies and health-food stores without a prescription, although there is no certainty about the purity of the products or the dose of the active ingredients because they are not monitored by the U.S. FDA. The National Institutes of Health studied glucosamine in the treatment of the pain of osteoarthritis. Their initial research demonstrated only a minor benefit in relieving pain for those with the most severe osteoarthritis, and in most patients, there was no benefit greater than that from placebo pills. Further studies, it is hoped, will clarify many issues regarding dosing, safety, and effectiveness of different formulations of glucosamine for osteoarthritis. People taking blood thinners should be careful when taking chondroitin as it can increase blood thinning and cause excessive bleeding. Fish-oil supplements have been shown to have some anti-inflammatory properties, and increasing the dietary fish intake and/or taking fish-oil capsules (omega-3 capsules) can sometimes reduce the inflammation of arthritis.
While oral cortisone is generally not used in treating osteoarthritis, when injected directly into the inflamed joints, it can rapidly decrease pain and restore function. Since repetitive cortisone injections can be harmful to the tissues and bones, they are reserved for patients with more pronounced symptoms.
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What is the best treatment for osteoarthritis?
The ideal steps to take should lead to a proper diagnosis and an optimal long-term treatment plan. While many steps are described here, the plan must be customized for each person affected by osteoarthritis, depending on the joints affected and the severity of symptoms.
An opinion regarding the cause or the type of arthritis can often be adequately obtained by consulting a general family doctor. It is often unnecessary to see an arthritis specialist (rheumatologist) for this purpose. However, if the diagnosis or treatment plan is unclear, a rheumatologist might be consulted.
When classic physical examination features from osteoarthritis are present, such as Bouchard's nodes or Heberden's nodes, the diagnosis of osteoarthritis may be solely based upon the examination, without the need for any additional tests, such as blood or X-ray testing. Sometimes, testing can be helpful to better understand the degree and character of the osteoarthritis affecting a certain joint. It can also be helpful for monitoring and excluding other conditions.
Treatment may not be necessary for osteoarthritis of the hands with minimal or no symptoms. When symptoms are troubling and persist, however, treatment might include
- pain and anti-inflammatory medications,
- with or without food supplements, such as glucosamine and/or chondroitin.
- Furthermore, heat/cold applications and
- topical pain creams can be helpful.
As a first step, it is often recommended to try the over-the-counter food supplements glucosamine and chondroitin. Each of these health supplements has been shown by some studies to relieve the pain and stiffness of some (but not all) people with osteoarthritis. These supplements are available in pharmacies and health-food stores without a prescription. If there has been no benefit after several months, the supplement can be discontinued. Of note, the manufacturers sometimes make claims that these supplements "rebuild" cartilage. This claim has not been adequately verified by scientific studies to date.
For another type of dietary supplementation, it should be noted that fish oils have been shown to have some anti-inflammatory properties. Moreover, increasing the dietary fish intake and/or fish oil capsules (omega-3 capsules) can sometimes reduce the inflammation of arthritis. There is some evidence that vitamin D supplementation can reduce joint swelling of osteoarthritis.
- Another dietary supplement, avocado/soybean unsaponifiables, has been studied in osteoarthritis. Avocado/soybean unsaponifiables may prevent cartilage degradation and help with pain and stiffness. However, side effects have been reported including skin allergies, liver injury, and heartburn. Many of these side effects were resolved with the discontinuation of the supplement. Also, the ingredients and amount of active ingredients can vary widely between different brands.
Obesity has long been known to be a risk factor for osteoarthritis of the knee. Weight reduction is recommended for people who are overweight with early signs of osteoarthritis of the hands because they are at a risk for also developing osteoarthritis of their knees. Foods to avoid include those that promote weight gain. As described above, even modest weight reduction can be helpful.
Pain medications that are available over the counter, such as acetaminophen (Tylenol), can be very helpful in relieving the pain symptoms of mild osteoarthritis. Doctors often recommend these as first-line medication treatment. Studies have shown that acetaminophen, given in adequate doses, can often be equally as effective as prescription anti-inflammatory medications in relieving pain in osteoarthritis of the knees. Since acetaminophen has fewer gastrointestinal side effects than nonsteroidal anti-inflammatory drugs (NSAIDs), especially in elderly patients, acetaminophen is generally the preferred initial drug given to patients with osteoarthritis. If symptoms persist, then over-the-counter anti-inflammatory drugs such as ibuprofen (Advil, Motrin IB, Nuprin), ketoprofen (Orudis), and naproxen (Aleve) can be tried. Many patients do best when they take these medications along with their glucosamine and chondroitin supplements.
Some individuals get significant relief from pain symptoms by dipping their hands in hot wax (paraffin) dips in the morning. Hot wax can often be obtained at local pharmacies or medical supply stores. It can be prepared in a Crock-Pot and be reused after it hardens as a warm covering over the hands by peeling off and replacing it with melted wax. Warm water soaks and nighttime cotton gloves (to keep the hands warm during sleep) can also help ease hand symptoms. Performing gentle, low-impact range of motion exercises regularly can help to preserve the function of the joints. These exercises are easiest to perform after early morning hand warming.
Pain-relieving creams that are applied to the skin over the joints can provide relief of daytime minor arthritis pain. Examples include capsaicin (ArthriCare, Zostrix), salicin (Aspercreme), methyl salicylate (Ben-Gay, Icy Hot), and menthol (Flexall). For additional relief of mild symptoms, local ice application can sometimes be helpful, especially toward the end of the day. Occupational therapists can assess daily activities and determine which additional types of therapy may help patients at work or home.
Finally, when arthritis symptoms persist, it is best to seek the advice of a healthcare professional who can properly guide the optimal management for each patient. Many other prescription medications are available for the treatment of osteoarthritis for patients with chronic, annoying symptoms.
In addition to the steps described above, pay attention to joint problems elsewhere in the body if one develops early signs and symptoms of osteoarthritis of the hands.
What specialists treat osteoarthritis?
Osteoarthritis is treated by:
- general practitioners,
- family practitioners,
- physical therapists,
- occupational therapists,
- physiatrists, and
- other rehabilitation specialists.
What is the prognosis for osteoarthritis?
The prognosis of patients with osteoarthritis depends on which joints are affected and whether or not they are causing symptoms and impaired function.
- Some patients are unaffected by osteoarthritis while others can be severely disabled.
- Joint replacement surgery for some results in the best long-term outcome.
- Finally, if one is concerned that osteoarthritis could lead to injury of the internal organs, don't be.
- Osteoarthritis does not cause internal organ damage or blood test abnormalities.
Is it possible to prevent osteoarthritis?
There is no prevention of osteoarthritis with the exception of avoiding joint injury.
More information about osteoarthritis
For further information about osteoarthritis, please visit the following site:
Contact the Arthritis Foundation for additional information.
PO Box 19000
Atlanta, Georgia 30326
or contact a local chapter
National Arthritis and Musculoskeletal and Skin Diseases Clearinghouse
1 AMS Circle
Bethesda, Maryland 20892
American Academy of Orthopaedic Surgeons
9400 West Higgins Road
Rosemont, Illinois 60018
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Firestein, Gary S., et al. Kelley and Firestein's Textbook of Rheumatology, 2-Volume Set (Kelley's Textbook of Rheumatology) 10th Edition. Elsevier, 2017.
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