Studies show the long-term results depend on the amount of injury. If the tear is more than halfway through the ligament you have more than a 50 percent chance of further injury. The torn ligament can tear the rest of the way and you'll have a complete tear.
The risks have been reported as follows:
25 percent tears = 12 percent risk of reinjury and worse tear
50 percent tears = 50 percent risk of complete tear
75 percent tears = 86 percent risk of complete tear
It's not uncommon to have further joint damage when a ligament is reinjured. The meniscus and joint cartilage can get damaged too. The end result is joint degeneration years
Talk to your doctor about the extent of your ligament damage. Find out what your options are and the odds of success with each one. Your decision will depend in part on how active you are or would like to be in years to come. Athletes with sports participation in mind are often advised to have a surgical repair. Less active folks may decide to rehab without surgical repair.