Health A-Z

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Harvard Medical School

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Symptoms

Symptoms of an ACL injury can include:

  • Feeling a "pop" inside your knee when the ACL tears

  • Significant knee swelling and deformity within a few hours after injury

  • Severe knee pain that prevents you from continuing to participate in your sport (most common in partial tears of the ACL)

  • No knee pain, especially if the ACL has been completely torn and there is no tension across the injured ligament

  • A black and blue discoloration around the knee, due to bleeding from inside the knee joint

  • A feeling that your injured knee will buckle, "give out" or "give way" if you try to stand

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From Health A-Z, Harvard Health Publications. Copyright 2007 by the President and Fellows of Harvard College. All rights reserved. Written permission is required to reproduce, in any manner, in whole or in part, the material contained herein. To make a reprint request, contact Harvard Health Publications. Used with permission of StayWell.

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