<prompt> Not seen in osteogenesis imperfectaWormian bonesThick coexCoxa varaSaber shin  <response>: - Osteogenesis imperfecta is a type- 1 collagen defect which affects the tensile strength of the bone.it most commonly occurs in femur. It leads to weakening of bones. - Thin coex is the hallmark for osteogenesis imperfecta. - Deformities occurring in osteogenesis imperfecta includes saber shin bowing, Coxa vara decreased neck- shaft angle of femur and Wormian bones sho, dot- like. - Wormian bones are also found in down syndrome, osteogenesis imperfecta, trisomy and skeletal dysplasia 