Maybe Smoove will chime in. I think this is what he had done a year or so ago. Came back and ran an awesome Boston Marathon.
You can do a search for his thread where he documents his comeback post-surgery.
I found the thread where SMOOVE had TOPAZ done and came back for boston, is that the one you meant? Good thread, but not directly relevant. What's interesting is the physician I saw mentioned TOPAZ as a follow up to release if the surgery doesn't quite get it SMOOVE did the TOPAZ straight away.