@grrranny got it on the radiation. It is surprising he had a fracture with a score of -2.7, which is close to borderline. Was the fracture caused by the cancer? Did the DEXA take the fracture and cancer into account? I wonder if some docs would not prescribe for -2.7 even with a fracture, if the fracture was not caused by osteoporosis. I have no idea!

@bonana Reclast does not grow bone, but affects turnover so density increases over time- so it seems plausible that it is not a risk factor if you have had chondrosarcoma. Even Forteo and Tymlos , which do build bone, didn't scare me but my cancer wasn't in cartilege or bone. I hope your doctors can answer this question. It is hard when oncologist don't know osteoporosis and endos don't know cancer!