"Arthritis" is a term used to describe inflammation of the joints. Osteoarthritis (OA) is the most common form of arthritis and usually is caused by the deterioration of a joint. Typically, the weight-bearing joints are affected, with the knee and the hip being the most common.
An estimated 27 million Americans have some form of OA. According to the Centers for Disease Control and Prevention, 1 in 2 people in the United States (US) may develop knee OA by age 85, and 1 in 4 may develop hip OA in their lifetime. Until age 50, men and women are equally affected by OA; after age 50, women are affected more than men. Over their lifetimes, 21% of overweight and 31% of obese adults are diagnosed with arthritis.
OA affects daily activity and is the most common cause of disability in the US adult population. Although OA does not always require surgery, such as a joint replacement, it has been estimated that the use of total joint replacement in the US will increase 174% for hips and 673% for knees by the year 2030.
Physical therapists help patients understand OA and its complications, provide treatments to lessen pain and improve movement, and offer education about obesity and healthy lifestyle choices. Research has shown that light to moderate activities such as walking, biking, and swimming can provide more benefits than harm to your joints, and promote weight loss. One study showed that just an 11-pound weight loss reduced the risk of OA in the women studied.
Your bones are connected at joints such as the hip and knee. A rubbery substance called cartilage coats the bones at these joints and helps reduce friction when you move. A protective oily substance called synovial fluid is also contained within the joint, helping to ease movement. When these protective coverings break down, the bones begin to rub together during movement. This can cause pain, and the process itself can lead to more damage in the remaining cartilage and the bones themselves.
The cause of OA is unknown. Current research points to aging as the main cause. Factors that may increase your risk for OA include:
- Age. Growing older increases your risk for developing OA because degeneration and aging of the cartilage and synovial fluid increases over time.
- Genetics. Research indicates that some people's bodies have difficulty forming cartilage. Individuals can pass this problem on to their children.
- Past injury. Individuals with prior injury to a specific joint, especially a weight-bearing joint (such as the hip or knee), are at increased risk for developing OA.
- Occupation. Jobs that require repetitive squatting, bending, and twisting (eg, construction, landscaping, childcare) are risk factors for OA. People who perform jobs that require prolonged kneeling (eg, miners, flooring specialists) also are at high risk.
- Sports. Athletes who repeatedly use a specific joint in extreme ways (eg, pitchers, football linemen, ballet dancers, runners) and those who engage in high-impact joint loading done in a repetitive manner (eg, running, jumping, landing on hard surfaces) may increase their risk for developing OA later in life.
- Obesity. Being overweight causes increased stress to the weight-bearing joints (such as knees), increasing the risk for development of OA.
For more specific information click the following links:
- General Info
- Hip Arthritis
- Knee Arthritis
- Elite list of conditions