1fisher;1583940 said:
By definition, 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.
quoted from one of those medical sites..........
:
WebMD
http://www.webmd.com/hw-popup/Sprain
Sprains are injuries to the tough ropelike fibers (ligaments) that connect bone to bone. If you have a severe sprain, your symptoms may not be much different from those you would have with a broken bone. Health professionals rank sprains by degree of severity.
A first-degree sprain stretches the ligaments
but does not tear them. Signs and symptoms may include:
Mild to moderate swelling and pain.
A stable joint that does not feel loose or wobbly.
Normal movement.
A second-degree sprain partially tears the ligaments. Signs and symptoms may include:
A pop or snap felt or heard at the time of the injury.
Moderate to severe pain and swelling.
Restricted movement.
Bruising.
Mild to moderate instability.
A third-degree sprain completely tears the ligaments. Signs and symptoms may include:
A pop or snap felt or heard at the time of the injury.
Mild to severe pain (pain is sometimes less in a complete tear than in a partial tear).
Severe swelling and bruising (often, but not always).
An unstable joint (feels wobbly or loose).
A grating sound or feeling.
A bulge (sometimes) at the site of a complete tear.
A change in sensation, such as numbness or tingling.
Recovery time for a sprain can vary, depending on a person's age and health and the severity of the sprain. A minor sprain in a healthy person may heal in a few days to a few weeks. A severe sprain can take several months to heal and may never heal completely, resulting in long-term pain, limited movement, deformity and instability of the joint, and repeated injuries.
First aid for a sprain includes rest (immobilization), ice, compression, and elevation. While a minor sprain will often heal well with home treatment, a moderate to severe sprain may require medical treatment, such as a cast or splint, physical therapy, medication, or surgery.