Regional osteoporosis

Osteoporosis is a systemic skeletal disorder characterized by low bone mass, micro-architectural deterioration of bone tissue leading to bone fragility, and consequent increase in fracture risk. It is the most common reason for a broken bone among the elderly. [Source: Wikipedia ]

May Be Caused by

Common: Acro-osteolysis; Animal bite; Arteriosclerosis obliterans; Avascular necrosis; Bone sarcoma; Buerger disease; Burn; Disuse atrophy; Electroshock; Fracture infection; Fracture malunion; Fracture nonunion; Frostbite; Fungal arthritis; Hemophilia; Human bite; Immobilization; Juvenile chronic arthritis; Juvenile rheumatoid arthritis; Kaposi sarcoma; Metastasis; Myeloma; Osteomyelitis; Paralysis; Raynaud disease; Reflex sympathetic dystrophy; Reiter syndrome; Reiter/reactive arthritis; Rheumatoid arthritis; Septic arthritis; Soft tissue infection adjacent to bone; Synovitis; Thermal injury; Trauma; Vascular insufficiency
Uncommon: Arteriovenous malformation; Bone marrow edema syndrome; Congenital pseudarthrosis; Denervation; Diabetic osteopathy; Hemangioma; Idiopathicdemineralization; Myocardial infarction; Paget disease of bone; Regional migratory osteoporosis; Sarcoidosis; Scalenus anticus syndrome; Shoulder-hand syndrome; Tendon transection