I would ask for an urgent referral to orthopedics to get the scans checked there and see if they think it's osteoporosis or mets. They are probably more familiar with what osteoporosis looks like, although equally, the radiologist who analysed the scans may have that experience.
However, diagnostic procedures are usually only performed when clinically significant, i.e. when they might change treatments. If he's refusing treatments, then diagnostic procedures which might normally be clinically significant become less so, and are less likely to be offered, as their results are not going to be acted upon.