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Nat'l Inst. of Health (6)

Arthritis
If you feel pain and stiffness in your body or have trouble moving around, you might have arthritis. Most kinds of arthritis cause pain and swelling in your joints. Joints are places where two bones meet, such as your elbow or knee.

Joint Disorders
A joint is where two or more bones come together, like the knee, hip, elbow or shoulder. Joints can be damaged by many types of injuries or diseases. Arthritis or simply years of use may cause a joint to wear away. This can cause pain, stiffness and...

Knee Injuries and Disorders
Your knee joint is made up of bone, cartilage, ligaments and fluid. Muscles and tendons help the knee joint move. When any of these structures is hurt or diseased, you have knee problems. Knee problems can cause pain and difficulty walking.

Knee Replacement
Knee replacement is surgery for people with severe knee damage. Knee replacement can relieve pain and allow you to be more active. Your doctor may recommend it if you have knee pain and medicine and other treatments are not helping you anymore.

Mobility Aids
Mobility aids help you walk or move from place to place if you are disabled or have an injury. They include crutches, canes, walkers, wheelchairs and motorized scooters. You may need a walker or cane if you are at risk of falling. If you need to...

Sciatica
Sciatica is a symptom of a problem with the sciatic nerve, a large nerve that runs from the lower back down the back of each leg. It controls muscles in the back of your knee and lower leg and provides feeling to the back of your thigh, part of your...