Hi, thanks for writing to HCM.
It is practically impossible to predict when exactly your foraminal stenosis progresses to a severe level.
It depends on the amount of load that you impart on your lumbar spine
in doing your activities of daily living like bending forwards or lifting weights.
If you fail to respond to epidural steroid
injections, then the next level is a decompression surgery.
Hope this information is helpful. Good day