An anterior cruciate ligament, or ACL, injury is a tear in one of the knee ligaments that joins the upper leg bone with the lower leg bone. The ACL keeps the knee stable. Injuries range from mild, such as a small tear, to severe, such as when the ligament tears completely or when the ligament and part of the bone separate from the rest of the bone. A blow to the side of the knee, like during a football tackle, may result in an ACL tear. However, coming to a quick stop, combined with a direction change while running, pivoting, landing from a jump, or overextending the knee joint, can cause injury to the ACL. Sports like basketball, football, soccer, and skiing have regular occurrences of ACL tears.
- Feeling or hearing a pop in the knee at the time of injury
- Pain on the outside and back of the knee
- The knee swelling within the first few hours of the injury
- Limited knee movement
- Knee wobbling, buckling, or giving out
Total Knee Replacement
Knee replacement surgery 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.
Symptoms that may lead one to consider a knee replacement:
- Knee pain that doesn't respond to therapy (medication, injections, and physical therapy for 6 months or more)
- Pain that limits or prevents activities
- Inability to sleep through the night because of knee pain
- Arthritis of the knee
- Decreased knee function caused by arthritis
- Some tumors involving the knee