Osteogenesis imperfecta (OI), also known as brittle bone disease or Lobstein syndrome, is a congenital bone disorder characterized by brittle bones that are prone to fracture. OI may also present with shorter height, neurological features including communicating hydrocephalus, basilar invagination, and seizures, blue sclerae, hearing loss, or other complications. The fractures themselves can cause acute or chronic pain, reduced quality of life, and depression.