Ive had disc replacment at 3 levels in cervical spine,( resulting from compression injuries playing rugby then compounding it with heavy weights for a decade) the resulting nerve damage from this type of injury is unforgiving whilst i have improved in certain areas on my right side the muscles furthest away from the area that was compressed are gone, im 3 and a half years post op and my right lat especially the lower section is gone, upper back is okay along with the tricep to some extent and the pec is 50% what it was once, but spinal injuries are the end of life as you once knew it, I tell all young lifters at the gym to slow down, life is a marathon not a sprint. Big Ron has had this problem for years, Jay also has issues with spinal compression, after going through it myself i can identify it in others better than any doctors, the telltale signs are there, you need to pull up asap, to preserve your spine for the rest of your life, I cant train like I used to but I pulled up early enough so that im still able to live a fit athletic life without pain.