Are ‘Ass to Grass’ squats bad for your knees?

Is ‘Ass to Grass’ squats bad for your knees?

The squat is a corner stone exercise in almost every strength and conditioning program.

However a myth still lingers (deep within the physio world) that deep squats are dangerous to the knees and should never be performed.

There is a range of opinions when it comes to optimum depth of the squat. Some die hard lifts believe in the fable ‘Ass to Grass’ squat that, ‘this is the way.’ While others believe quarter squats are sufficient for functional training such as Dr Joel Seedman.

So what is the optimum depth for a squat?