As others have mentioned, doing a deca cycle poses 2 problems:

- deca shuts down your natural testosterone levels to almost nothing, which leads to all kinds of problems. This is why people always stack deca with testosterone.

- just as importantly, you could re-injure yourself or make your condition worse by taking steroids. Because steroids increase your strength so dramatically, you may end up lifting more than your back can handle, and end up re-injuring yourself. This is a serious possibility and would put you right back to square 1.

Best thing is to keep lifting as you are - naturally - slowly regaining strength in your back over the next year. Once you are able to lift heavy weight without worrying about re-injuring yourself, then you can consider a testosterone cycle (it is recommended that first-time steroid users start with one compound, and testosterone is THE core of any cycle, THE king and staple of all steroid users).

Hope this helps