I have an intramedullary rod/nail (it was called a rod then, now a nail) in my right tibia since 1991 (at 36). It was from a complete tib/fib break. Never set off a metal detector, but it does show up on the body scan. It wasn't a compound fracture, as the bones never came out of the skin, but it was quite severe, and the tibia was a clean complete cross sectional fracture, with the fibula a spiral fracture. The foot was twisted 180 degrees and pointed backwards. I was walking (kind of... the start of the rehab - bearing weight) in a week, and had a full leg cast for about 3 weeks, used crutches for a day, then one, then a cane, and was walking and rehabbing with no props in a month. It has never given me any problems, fully healed, and I was very active and a professional Hang Glider and Skydiver for years after, with no restrictions whatsoever. It surprises me that for a stress reaction this is being used, but it should have a relatively quick healing time, especially since Sano is under 26, and the osteoblast/osteoclast dance is more active, and the bones don't have to actually heal a severe break. The rod allows for weight bearing very quickly, and the weight bearing even helps it heal. The locking screws must be a newer addition, as I don't have them at all, and have not had any migration of the rod. Sano will be limited on cardio movements, for sure, and it will be a challenge to find a routine to keep toned and not gain weight, especially if he has not learned to eat a little less than he needs to maintain. If he lacks self control, and pigs out, he will skyrocket, as we all will.