Welcome Mark.
Sounds like you didn't have a sports med doc do your surgery.
I had knee surgery in 2008. My sports med doc (who is also a cyclist) had me on my bike on the trainer 8 hours after surgery. Toughest 5 minutes of my life.
Riding the bike was my physical therapy. After 4 weeks I was out on the road again. I'm now 65 and ride my road bike about 4 days a week.
Get a bike that fits and feels comfortable and you'll be back at it in no time. Good luck.
