A knee sprain is an injury to a knee ligament. The sprain may vary in severity from a slight stretch to a complete tear of the ligament.
A mild, or grade 1, sprain simply stretches the ligament and causes pain and swelling. A moderate, or grade 2, sprain partially tears the ligament and is much more disabling. A severe, or grade 3, sprain is a complete rupture and often needs surgical repair.
Knee Sprain Description
Most ligament injuries of the knee involve a tearing of either the medial collateral ligament (MCL) on the medial side of the knee (medial means toward the midline of the body, and lateral means away from the midline), the anterior cruciate ligament (ACL) deep inside the joint, or both ligaments. The posterior cruciate ligament (PCL) is much less likely to sustain an injury than the ACL.
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