Forbes,
Sorry to hear that your friend is having problems.
Unfortunately, patients often do not realize that when a bone is fractured, it is not the only tissue which is damaged. When a bone breaks, the periosteum (the soft tissue sheath on the outside of the bone) is ripped apart, the muscle attachments are torn off, the fascia is stretched, as are the nerves and blood vessels. All this soft tissue damage also has to heal, which it does with the formation of scar tissue. Of course, scar tissue does not act as the tissues normally would.
If she had such significant osteoporosis, that she needed to be on medication, she would most likely have not done well with surgical intervention. The application of a plate and screws depends on the security of the screws going into the bone. Unfortunately, screws do not hold well in osteoporotic bone. It is akin to putting screws into cork or Styrofoam. They just pull out. So, the internal fixation construct just fails. And the patient has now gone through a surgical procedure which would place nerves at risk, form more scar tissue, only to fail. Thus, if a patient has very significant osteoporosis, surgical fixation is often not a viable option.
Also, surgery does not speed up the healing of bones. If fact, when a DCP (dynamic compression plate) is used on a long bone fracture, it causes the bone to heal by primary endosteal ossification, which actually takes longer than with the formation of callus (when fractures are just immobilized).
It is unfortunate that your friend continues to have problems after her injury. But, it sounds as if she was treated (and is being treated) appropriately. When patients have continued pain in the region of a fracture, you have to make sure that the bone is healed, which is sometimes difficult to tell on just flat film x-rays.
If she is unable to tolerate laying in an MRI machine for an hour, perhaps a CT scan (which can be done is just a few minutes) would provide the surgeon with the information needed. Also, in some cases, patients can be sedated for an MRI. But, this is only usually done if the study is really needed (life threatening situation).
So, at this point, she is sort of limited in what her surgeons can do for her. Pain management is probably the best route to go. But, unfortunately, most of the management of pain comes from the attitude of the patient and it sounds like she is bitter about her injury and is trying to deflect the situation (‘well, I would not have these problems if I was operated on.’ When in actuality, she may have been worse off if the construct failed and she had to have multiple operations for years of time.) Also, pain management is just that, management, it is not just giving out pills to snow the patient. It is designed to help the patient be more functional (not pain free - no such thing).
Again, sorry that your friend is having problems, but at least her humerus (I assume it is the humerus, since you said the bone in the arm, not forearm) is now healed. The rest she can work on.
Wishing you and your friend the best. Good luck.