Well, we finally followed up with the surgeon today. She is pleased with his progress and says that these things tend to go better for athletes. She also indicated that she cycles some. Then, we talked about his injury and surgery.
She said it was a "very serious" injury and that his bone was basically shattered in a "high energy" impact. There was apparently traction and a whole box full of hardware needed to get the thing back to some semblance of normal. She is also not sure this will be the end of surgeries, but she is hopeful.
I asked if his x-ray was good in two weeks and if he cleared the blood clot check today if he could think about riding the trainer in the garage. She said "absolutely not!". I guess that was a definitive answer. She basically said not to count on anything for the first 8 weeks. She is going to monitor him every couple weeks until then and then see how things progress. I'm sure that's not what the Boy wanted to hear. In the meantime, he will enjoy his "exercise" on crutches and moving the ankle and leg around as much as possible.
Looks like our vacation this year will likely not feature mountain bikes in Argentina and will more likely feature tropical drinks and a beach - not that there's anything wrong with that!