Holy fuck, yea any of those bones are terrible ones for healing, cause there round bones unfortunately, mostly fusions, is all that can be done. sadly.
Keep elevated,(above heart, when possible) promote circulation and reduce swelling keep rooms warm... aspirin 1 per day, might be helpful, or some mild blood thinner. (speak with MD) I have taken care of extremity reattachment surgeries. Fingers, and arm reattachments, transplants.
stay off, until fully healed. keep room area's warm and keeping it it warm is highly advised. Good blood sugars, and blood flow. Watch for any signs of infection and follow up fast.
Keeping that area none wt bearing, and allowing for time with foot elevation (on pillow above chest) is going to help
bigtime. watch the back of the knee for any restriction by pillows, or props... best to elevate right on the calf area itself, or distal from that aspect. Do not restrict blood flow, and report any/all neuro deficits. tingling/pricking/coolness/cold/black toes, ect...
black in blue is fine, necrotic and dead, black =
the bad.