Axial loading and degenerative disc issues

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This question of primarily for the medical professionals, especially those with

extensive knowledge of the skeletal system and spinal issues, however all

replies are welcome. In one of the gyms I train out of there is a gentlemen who

suffers from severe degenerative disc issues relative to L4/L5. No surgery

performed at this time. He is approx 30 years old, 6'2 " and 220lbs or so and I

would guess him at somewhere between 22 and 26% bodyfat. I mention the bodyfat

so as to give some indication of physical condition. Given the disc issues it

is my position that axial loading should be of some concern. Especially,

barbell squats with at least 315lbs that I have observed. Out of concern for

the individual, I mentioned my reservations regarding this particular exercise

as it relates to his disc issues. He informed me that through working with his

physical therapist and chiropractor over the last several years he has been able

to return this exercise with this kind of weight as long as there is no flexion

in the torso or rounding of the back. Unfortunately I have observed his form

and it is less than stellar to say the least. However, it is my current

contention that even with perfect form this practice is suspect and potentially

dangerous given his condition. For the benefit of my own education can anybody

describe for me a scenario in which this individual, under these circumstances

is clear to barbell squat 315lbs or anything close to that?

Tom Capobianco

Cincinnati, Ohio USA