Had 2 tears in my left knee. Was playing basketball with my kids when i heard a pop, and had instant pain. I waited like 6 months before i went to the Dr. After an MRI he confirmed that there were 2 separate tears. Had surgery last November and a year later i am about 95% better. Some days are better than others. If i would tear another i would not hesitate to go earlier. The pain was causing arthritis in my knee. Definitely do the physical therapy to a T. Helped with recovery.