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What Are Some Common Knee Problems and Injuries?

Common knee problems and injuries include the following:

• Sprained or strained knee ligaments and/or muscles
  A sprained or strained knee ligament or muscle is usually caused by a blow to the knee or a sudden twist of the knee. Symptoms often include pain, swelling, and difficulty in walking. Learn more about knee ligament injury.
• Torn cartilage
  Trauma to the knee can tear the menisci (pads of connective tissue that act as shock absorbers and also enhance stability). Cartilage tears can often occur with sprains. Treatment may involve wearing a brace during an activity to protect the knee from further injury. Surgery may be needed to repair the tear.
• Tendonitis
  Inflammation of the tendons may result from overuse of a tendon during certain activities such as running, jumping, or cycling. Tendonitis of the patellar tendon is called jumper's knee. This often occurs with sports such as basketball, where the force of hitting the ground after a jump strains the tendon. Learn more about tendonitis.
• Arthritis
  Osteoarthritis is the most common type of arthritis that affects the knee. Osteoarthritis is a degenerative process where the cartilage in the joint gradually wears away, and often affects middle-age and older people. Osteoarthritis may be caused by excess stress on the joint such as repeated injury or being overweight. Learn more about arthritis.
• Rheumatoid arthritis
  Rheumatoid arthritis can also affect the knees by causing the joint to become inflamed and by destroying the knee cartilage. Rheumatoid arthritis often affects persons at an earlier age than osteoarthritis. Learn more about rheumatoid arthritis.