What happens if I leave a torn ACL untreated?

Untreated is not the same as non-surgical

Choosing not to have surgery, and following a structured rehabilitation programme with sensible sport choices, is a valid treatment. Leaving the knee untreated usually means no rehabilitation, a weak thigh and a return to the same pivoting sport. The long-term risks mostly belong to the second group.

What can happen to an unstable knee over time

• Meniscus tears: the menisci act as back-up stabilisers when the ACL is missing, and they are often torn by repeated shifting
• Cartilage damage: sudden giving way can bruise or chip the joint surface
• Early osteoarthritis: meniscus loss and cartilage damage both raise the risk of wear in later years
• Loss of confidence: many people quietly stop sport, put on weight and lose fitness
• Harder surgery later: repeated injuries can mean the meniscus can no longer be repaired and has to be partly removed

Not every unstable knee follows this path, but the pattern is common enough to take seriously.

Signs that an old ACL tear is causing damage

Watch for new episodes of giving way, new swelling after activity, catching or locking, pain along the joint line, or a knee that will no longer straighten fully. These suggest a new meniscus tear or other change inside the knee and are a reason to be examined.

Protecting the knee if you do not want surgery

Keep the quadriceps and hamstrings strong, maintain a healthy weight, and favour activities such as cycling, swimming, gym work and straight-line running. If you do play football or padel, understand the risk and report any giving way.

At Aman Hospital, Dr. Gelber can review an old ACL tear, check the meniscus and cartilage on MRI if needed, and discuss whether reconstruction now would protect the knee.