What are the signs and symptoms of an ACL injury?

A twist or strain has occurred which causes the following signs:

  • "Pop" - Many patients, but not all, will hear or feel a "pop" when the ACL tears.
  • Immediate onset of swelling - This is an indication that there is bleeding from the injured ligament.
  • Pain - Most patients experience quite a bit of pain with an ACL injury.
  • Instability - Patients often describe a buckling or unstable sensation in the knee.

see "What is an ACL injury?"

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