I don't think the medical community has developed a reliable total ankle replacement. Unlike the knee, the ankle is an extremely complex joint. By comparison, the knee, shoulder, and hip are very simple joints, with few moving parts, ligaments, tendons, etc.

I'd do a lot of research and ask the surgeon a lot of questions before doing a TAR, especially on the expected outcomes.

I've had both big toe joints fused to correct bunions and arthritic spurs. It is technically possible to replace the joint, but the outcomes are usually bad, or the joint only lasts a short time.

Sorry I don't have more encouraging news. But it's just my opinion, so most certainly get some others, including a second medical opinion.