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Source: Verywell Health

The sensation of knee instability or weak knees, which many describe as the knee "giving out," may occur suddenly or develop gradually over time. It may be the only symptom of a problem or be accompanied by signs such as popping, locking, pain, bruising, or swelling.

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  • American Academy of Orthopaedic Surgeons
  • Medical University of South Carolina
  • Athe American College of Surgeons
  • American Shoulder And Elbow Surgeons