Primary hypotrophic osteoarthropathy is a rare condition, which is seen in some persons. The cause of this is not clearly understood, however, the presentation is as you have explained. There is no definite treatment for this. Most patients are able to manage without significant disability. If you have gross swelling then you may need to consult a physician (not an orthopaedic surgeon) to manage the swelling without having to take recourse to a bed rest and elevation. The details on this condition are available on the net however all of them would be too technical for a lay person.
As far as recent advances are concern there are some reports that Biphosponates help in some patients. Another drug used in breast cancer Tamoxyfen has been reported to be useful in two patients. These are all anecdoted reports not supported by solid evidenced based research. Do consult a Physician (Rheumatologist) for further advice.