Anterior Cruciate Ligament Tear (ACL Tear)

An ACL injury is the tearing of the anterior ligament, or ACL, inside your knee joint. An ACL injury most commonly occurs during sports that involve sudden stops and changes in direction - such as basketball, soccer, tennis and volleyball.

Immediately after an ACL injury, your knee may swell, feel unstable and become too painful to bear weight. Many people hear a "pop" in their knee when an ACL injury occurs.


  • A loud "pop" sound
  • Severe pain
  • Knee swelling that usually worsens for hours after the injury occurs
  • A feeling of instability or "giving way" with weight bearing

Total Knee Replacement

Knee replacement surgery - also known as knee arthroplasty - can help relieve pain and restore function in severely diseased knee joints. During knee replacement, a surgeon cuts away damaged bone and cartilage from your thighbone, shinbone and kneecap and replaces it with an artificial joint made of metal alloys, high-grade plastics and polymers.

You may be a candidate for knee replacement if:

  • Your pain is disabling. People who need knee replacement surgery usually have problems walking, climbing stairs, and getting in and out of chairs. They also may experience moderate or severe knee pain at rest.
  • Other treatments haven't helped. More conservative treatments include weight loss, physical therapy, a cane or other walking aid, medications, and braces.
  • You have a knee deformity. Knee replacement can be especially helpful for people who have a knee that bows in or out.