I have done everything just shy of amputation of my legs below the knees.
Torn LCL, torn MCL, torn ACL, torn PCL, torn Meniscus, multiple traumatic patellar dislocations, anterior knee dislocations and tibial shaft fractures, leading to patellofemoral arthralgia and retropatellar tendon bursitis...... (no kidding, this is actually IN my medical records!!)
In other words, I need new knees.
And, for lack of better words, you learn to live with the pain. Wish I could give you better news, but there are days I don't even wanna get out of bed.