This type typically occurs with old age, and is not an inflammatory process. The above radiographs depict a type of RA that almost always begins in the SI joints. This is the most common form of dwarfism. Short limbs are characteristic, but trunk size is normal. This is an inherited disorder characterized by multiple fractures due to the faulty ossifications of the skeleton.
Many infants are bone with multiple fractures.
The above images represent benign bone lesions. Lesions are typically large and lucent, and are often found incidental to a pathologic fracture. BrighamRAD Teaching Case Database, Harvard University. Both images above depict a malignant tumor of cartilaginous origin. Typically occurs in middle age and affects men more often than women.