Osteogenesis imperfecta (OI) types VII, VIII and IX, caused by recessive mutations in cartilage-associated protein (<i>CRTAP</i>), prolyl-3-hydroxylase 1 (<i>P3H1</i>) and cyclophilin B (<i>PPIB</i>), respectively, are characterized by the synthesis of overmodified collagen.
We propose a revised classification of OI with exclusion of OI type VII and VIII since these types have been added because of genetic criteria (autosomal recessive inheritance) while the clinical and radiological features are indistinguishable from OI types II-IV.