<unk>  is considered to be a type of insufficiency<unk> . On imaging,radiolucent areas occurring at right angles to the cortex and extending across a portion of the bone diameter are seen. It is frequently bilateral. Characteristic sites of involvement are the axillary margins of the scapula, ribs, pubic rami, proximal end of the femur, and ulna.
Looser fracture
Grief
Character displacement
Osteomyelitis causes
Blunt 
Chronic pain
Chronic 
Osteochondroma risk factors