My previously torn hamstring was detected years later (decades) by getting an MRI of my lower back. I've had years of asymmetry and discomfort mostly from loss of disc space in L5-S1 and L4-L5 (no disc space actually). It really wasn't an issue that they could fix (hamstring) since it was long healed over, though scarred. Time puts wear and tear on the body. I just do what I can (exercise and rehab) and deal with it.