The ACL (anterior cruciate ligament) is one of the key stabilising ligaments in your knee. It connects the thigh bone (femur) to the shin bone (tibia) and plays a major role in keeping your knee stable during movement.
When the knee bends, the ACL prevents the shin bone from gliding too far forward and limits excessive twisting between the thigh and shin bones. In fact, it provides around 85% of the resistance to that forward movement — which is why it’s so important for athletes and active people.
ACL tears are one of the most common serious knee injuries. About 80% of sports-related ACL injuries occur without direct contact — they happen suddenly when:
pivoting or twisting on a planted foot
landing awkwardly from a jump
decelerating suddenly
changing direction quickly (“cutting”)
These movements are common in sports like netball, football, basketball, and skiing
This image shows the structure of the ACL and the way in which an ACL might be injured.
If you’ve injured your ACL, you might:
hear or feel a “pop” at the moment of injury
experience your knee giving way or collapsing
develop swelling, sometimes immediately
feel pain or instability when walking or trying to bear weight
Not every ACL tear causes instant swelling or extreme pain, but any instability in the knee
If you suspect an ACL injury:
Stop playing immediately.
Avoid putting weight on the affected leg — use crutches or support if needed.
Apply compression with a firm bandage.
Use ice to help reduce swelling and pain.
Book an assessment with a physiotherapist or doctor.
At The Healthy Body Company, our physiotherapists are experienced in on-field sports injury assessment and management. We can arrange MRI referrals when required and guide you through your individual recovery plan. See our recent articles on the Cross Bracing Method.
Early and accurate assessment makes all the difference in ACL recovery. If you’re dealing with a knee injury or instability, book an appointment with your local Healthy Body Company clinic for expert advice and a clear plan forward.
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