rib cage won't mend after heart surgery

My father had several open heart by-pass surgeries and following the last attempt two years ago, his rib cage won't mend.  He has been told that he will need a bone graft for the rib cage but because he is a high-risk patient it has to be done in a minimally invasive way.  What would be his best option for this type of surgery?  Are there any clinics which are specialized in this type of surgery for high-risk patients (preferably in Canada but alternatively in the U.S.)?  Thank-you.

[CCF CARDIO MD - DLB]

This is a particularly difficult situation and the results of this type of surgery are often not good. I would not say any hospital specializes in this, as it is an infrequent type of surgery.

[Anne1206]

A related discussion, rib  cage mending was started.

[jam1112]

A related discussion, rib pain after open heart surgery was started.