Over stretch or tearing of the anterior cruciate ligament in the knee (can be a tear that is partial or complete)
Method of injury is when your foot is firmly planted on the ground and a force hits your knee cuasing the tear in your ligament
A loud Pop sound
Severe pain Not able to continue the activity
Swelling
Loss of ROM
Instability giving way
For the swelling apply first aid R.I.C.E
Rest
Ice
Compression
Elevation
Most doctors offer surgery if you want to continue doing the sport. After surgery you'd just rest and wait for it to heal
Rest
ROM exercise
Improve bending of the knee to 120 degrees/quad/hamstring strength
Improve walking/maintain patternt
Exercises That strengthen leg Muscles
Squats
Lunges
Use good teqnich while doing them