Small calf after disc herniation

Over a year ago, I was diagnosed with 2 herniated disc on my S1 and L5. Had an injection to the spine and have been pain free ever since. The problem is my left leg is abnormally weak and my left calf have not gained much muscle ever since. It wasn't really noticeable before because I was still pretty overweight so my left calf and legs were still pretty meaty. I've lost a lot of weight and now it's really noticeable.

I have tried to build muscle on my left calf but it's just not working. I'm assuming it has something to do with the damaged nerve keeping it from building muscle normally. I can't stand do calf raises or even stand on my tip toe.

Any help would be appreciated