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Understanding Knee Pain

A joint is formed by two or more bones that are connected by thick bands of tissue called ligaments. The knee is the largest joint in the body and is made up of three main parts:

  • The lower end of the thigh bone, or femur.
  • The upper end of the shin bone, or tibia.
  • The kneecap, or patella.

The thigh bone (femur) turns on the upper end of the shin bone (tibia), and the kneecap (patella) slides in a groove on the end of the thigh bone. Ligaments, which are bands of tissue, connect the thigh bone and the shin bone to help keep the knee joint steady. The quadriceps, the long muscles on the front of the thigh, help strengthen the knee.

A smooth substance called articular cartilage covers the surface of the bones where they touch each other within the joint. This articular cartilage acts as a cushion between the bones. The rest of the surfaces of the knee joint are covered by a thin, smooth tissue liner called synovial membrane, which makes a small amount of fluid that acts as a lubricant so that the joint bones will not rub against each other.

What Causes Knee Pain?

One of the most common causes of knee pain and loss of mobility is the wearing away of the joint’s cartilage lining. When this happens, the bones rub against each other, causing significant pain and swelling. The most common cause is a condition known as osteoarthritis. Trauma or direct injury to the knee can also cause osteoarthritis. Without cartilage there is no shock absorption between the bones in the joint, which allows stress to build up in the bones and contributes to pain.

Arthritis is one of the most common causes of joint disorders. More than 42 million people in the United States are diagnosed with arthritis.1

1Arthritis Foundation website, http://www.arthritis.org/facts.php, accessed Oct. 2008.

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The Coon Joint Replacement Institute values your privacy and handles your personal information with care. Your email address and information is secure, confidential and will not be sold to any third party sources.

AHI Rebrand