Idiopathic regional osteoporosis: a clinical spectrum

Regional migratory osteoporosis (RMO) and transient osteoporosis of the hip are entities characterized by osteopenia of periarticular bone. They are considered separate disorders because the clinical setting and pattern of joint involvement in each is reportedly different. We have observed 3 patients whose overlapping features lead us to believe that rather than being distinct entities, RMO and transient osteoporosis may be examples of the same spectrum of disease.