I finally come across an article explaining what a grade 3 sprain is. (May help someone else trying to decipher this)
"About ½ of all injuries to the anterior cruciate ligament occur along with damage to other structures in the knee, such as articular cartilage, meniscus, or other ligaments.
Injured #ligaments are considered “sprains” and are graded on a severity scale.
Grade 1 Sprains
The ligament is mildly damaged in a Grade 1 Sprain. It has been slightly stretched, but is still able to help keep the knee joint stable.
Grade 2 Sprains
Stretches the ligament to the point where it becomes loose. This is often referred to as a partial tear of the ligament.
Grade 3 Sprains
This type of sprain is most commonly referred to as a complete tear of the ligament. The ligament has been split in 2 pieces, and the knee joint is unstable.
Partial tears of the ACL are rare;
More ACL injuries are complete or near complete #tears."
To better understand I pull out my #MRI again and reread (in Oct 6 & 7 posts).