What exactly is arthritis? “Arthr” means joint, and “itis” means inflammation – heat, swelling, and redness. But the inflammation of arthritis isn’t always something you can see. 

“Some types of arthritis are very inflammatory, and others aren’t as much. But they all involve an element of inflammation,” explained Dr Joanne M Jordan of the University of North Carolina at Chapel Hill.  

OSTEOARTHRITIS 

Arthritis comes in many forms. In fact, there are more than 100 types, each with its own symptoms and treatments. The most common form of arthritis is osteoarthritis. 

Osteoarthritis occurs when cartilage, the tissue that cushions the ends of the bones within the joints, breaks down and wears away. It most often affects the fingers, knees, and hips. 

Osteoarthritis can follow injury to a joint. For example, years after a soccer injury to a knee, a patient might get osteoarthritis in the knee. Once they’ve had a severe joint injury, it’s important for patients to be careful about what kind of activities they do. 

“You should be active because, ironically, being active can help prevent disease,” said Dr David Felson of Boston University. “But try not to be active in ways that can make your joint vulnerable to injury again.” 

For the most part, researchers don’t know a lot about how and why osteoarthritis occurs. Women tend to get it more often than men. You tend to get it as you get older. 

“Many factors that affect osteoarthritis are things you can’t control, like how old you are and what gender you are,” Dr Felson said. But some risk factors are under your control, including your weight. “Even moderately overweight people have an increase in knee osteoarthritis.” 

Many treatments are available for osteoarthritis. Several pain and anti-inflammatory medicines are available by prescription or over the counter. 

Perhaps the most promising treatments for osteoarthritis right now, Dr Felson said, involve ways to block pain. Researchers are working on other approaches as well, including exercise routines and devices that alter the alignment of joints. For severe cases of osteoarthritis, scientists have developed improved surgeries to replace knees and hips. 

GOUT 

Another common type of arthritis is gout. Gout usually affects the big toe, but many other joints may be involved. It’s caused by needle-like crystals that build up in the joints. 

Patients with gout might try to avoid certain foods – including liver, beef, anchovies, and meat gravy – because they can bring on a gout attack in some people. These foods are rich in molecules called purines, which break down in the body and can ultimately contribute to crystal formation. Drinking alcohol, being overweight, and taking certain medications may make gout worse. In older people, some blood pressure medicines can also increase the chance of a gout attack. 

Advise patients that their doctor might do blood tests and X-rays to find out if they have gout. If they are diagnosed with gout, it can be treated several different ways, often in combination. 

RHEUMATOID ARTHRITIS 

A very different type of arthritis is called rheumatoid arthritis. In contrast to osteoarthritis and gout, which affect particular joints, rheumatoid arthritis can affect your whole body. It arises when the immune system mistakenly attacks the body’s own joints. That can bring pain, swelling, stiffness, and loss of function in joints and bones – most often in the hands and feet. Rheumatoid arthritis may also affect internal organs and systems. Patients may feel sick or tired or have a fever. 

Laboratory tests for certain immune system activity can confirm whether a patient has rheumatoid arthritis. The good news is that now there are medications not only to control pain and inflammation, but to actually slow or stop damage to the joints. 

A lot of new treatments that have come out in the past 10-15 years have revolutionised the treatment of rheumatoid arthritis,” Dr Jordan said. 

Some rheumatoid arthritis medications interfere with the immune system’s activity. By interrupting the events that lead to inflammation, these medications help block inflammation and prevent structural damage to the joints. 

“If you’re concerned you have rheumatoid arthritis, it’s important to see a doctor fairly soon,” Felson advised. “Your joints can be damaged by the process of arthritis, and that damage cannot be reversed, so it’s important to get treatment as early as possible.” 

Researchers continue to explore what causes arthritis. A better understanding of the factors involved might lead to new treatment approaches. Genes play a significant role in many types of arthritis. For example, scientists have linked certain immune system genes with a tendency to develop rheumatoid arthritis. Genes involved in how uric acid is processed have been tied to gout. 

For osteoarthritis, Dr Jordan estimated that up to 30% to 60% of a patient’s risk may lie in the genes they inherited from their parents. “The tricky part, though, is that it’s not a single gene,” Dr Jordan explained. “It’s a lot of different genes that interact with each other and with the environment to cause the disease.” 

SOURCE: National Institutes of Health