Yes, I had the same surgery. Recovery is brutal. With the cadaver bone placement, your leg has to stay locked straight for as long as possible. In my instance, it was locked straight three weeks post-op and then gradually allowed to bend (only when sitting or laying down). Not allowed to bend when walking for 6-8 weeks.
The problem with that is the knee gets extremely tight after not bending that long and takes some very painful physical therapy to get loosened back up.
Isaac is much younger get than me and will do better I’m sure. For reference though, I was not out of shape, and was an avid marathoner.