Let me play this game called being a 'know it all' and i shall explain the mechanics of the knee and how going 'above or to //' puts more unwanted stress on the connective tissue of the knee.
You have 4 main protective ligaments in the knee, ACL, PCL, MCL and LCL. At the times of thier best postion during the squat is at standing or full squatting. By full squatting i mean full passive ROM that each individual can achive. The time when the 4 ligaments are at their most dangerous position and most unstable position is at 90 degrees due to the fact they are relaxed and cannot provide any safety for the knee. Now tell me, would it be so wise to stop at this point where there is no safety for the knee with 500-600 pounds on your back? Id think not. Most of the time knee injuries are a chronic problem that most dont relize till many yrs afterwards.
Exactly. I have damage to my acl,mcl, and lcl in my right knee and once i started going to full depth on my rom my knee stopped hurting and actualy got better.
Cheers,
Scotsman
Kc