A knee sprain is the stretching or tearing of ligaments that support the knee. Ligaments are strong bands of tissue that connect bones to each other.

Ligaments of the Knee
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Knee sprains may be caused by:

  • Forced twisting of the knee
  • Stopping suddenly while running
  • Shifting your weight while running or skiing
  • Landing awkwardly after jumping
  • Blow to the outer or inner side of the knee
  • Blow to the front of the knee while the knee is bent and the foot is firmly planted on the ground