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Anterior Cruciate Ligament (ACL) Tears

The anterior cruciate ligament runs from the top bone of the knee to the bottom one and prevents the top bone from sliding forward when the foot hits the ground during running and walking. If it is torn, the knee becomes so unstable that a person will have difficulty walking, so all torn anterior cruciate ligaments must be repaired.

A study from East Germany showed that athletes who tear the anterior cruciate ligament (ACL) in their knees will have permanent knee damage if they return to competitive sports (Arthroscopy, June 2005). In this study, East German Olympic athletes who tore their knee ligaments in 1963-1965, and returned to competition after having their ligaments repaired, were examined 10 and 20 years later. Virtually all had severe knee cartilage damage and more than half had total knee replacement surgery.

Athletes with repaired torn ACLs probably should never run or jump again, although they may be able to pedal a bicycle. Another study showed that people who have broken cartilage in their knees can walk and cycle, but should not run or jump.

To keep your bones from wearing down at the joints, their ends are covered with a thick white gristle called cartilage. Even one bleed into a joint damages its cartilage forever. Doctors cannot replace or heal broken cartilage, they can only replace entire knee joints. Operating and removing broken cartilage probably increases a person's chances of needing a knee replacement, particularly if the exerciser continues to run and jump. Shearing forces on the knee are very great during walking downhill and running, and minimal during walking on level ground and cycling. So people who have ever damaged cartilage in their knee should walk on level ground, swim or cycle, and avoid running and jumping.

Checked 2/7/14

May 11th, 2013
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About the Author: Gabe Mirkin, MD

Sports medicine doctor, fitness guru and long-time radio host Gabe Mirkin, M.D., brings you news and tips for your healthful lifestyle. A practicing physician for more than 50 years and a radio talk show host for 25 years, Dr. Mirkin is a graduate of Harvard University and Baylor University College of Medicine. He is board-certified in four specialties: Sports Medicine, Allergy and Immunology, Pediatrics and Pediatric Immunology. The Dr. Mirkin Show, his call-in show on fitness and health, was syndicated in more than 120 cities. Read More
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