I was diagnosed with
spondylolisthesis , L4-L5. Had numbness in my lower back and legs down to my knees, could not stand or walk for more than 5-10 minutes without sitting down. My surgery was called
ALIF, where they went through my abdomen and placed a spacer between L4-L5, then flipped me over and fused the two vertebrae. Was up walking within 24 hours, and only stayed in the hospital one night (RWJ Somerville).
The first three weeks of recovery were difficult - it was hard to manage the pain without getting sleepy. Was planning to go back to work (remotely) after two weeks, ended up needing an extra week. After the three weeks, however, I was feeling pretty good.
The pain/numbness in the back that I was experiencing was relieved almost immediately. Within 2 months I could stand and walk for indefinite periods, and within 6 months I was hitting tennis balls (don't tell my MD). Did about 10 sessions of PT, not sure it was of much value other than getting a nice massage.
Overall, would make the decision to do it again in a heartbeat. The increase in quality of life was dramatic, and the only remaining symptoms are a bit of arthritis-like stiffness in the AM that resolves quickly.
Hope this helps, happy to answer any questions.