<prompt> All are features of Osteogenesis imperfecta except:Blue scleraMultipleCataractHearing loss  <response>: Ans. is c i.e. Cataract Osteogenesis imperfecta firagilitas ossium:This condition is characterised by tendency for frequent fractures because of weak and brittle bones.It results from defective collagen synthesis type I collagen. Thus also affecting other collagen containing soft tissue such as skin, sclera, teeth, ligaments etc.inheritance is AD or ARAR is very severe form and the child is bom with multiple fractures and diesClinical features:Blue sclera because of thin sclera colour of underlying choroid is visible.Joint laxity bc of weak ligamentsHearing loss bc of otosclerosisHernias because of defective skinBrittle bones because of abnormal synthesis of bone matrix.The fractures unite normally but deformities secondary to malunion or joint contractures may occur.Other causes of tendency for easy fractures:OsteoporosisOsteopetrosisOsteomalaciaPolio limb 