4.7 Article

Osteogenesis imperfecta - A clinical update

Journal

METABOLISM-CLINICAL AND EXPERIMENTAL
Volume 80, Issue -, Pages 27-37

Publisher

W B SAUNDERS CO-ELSEVIER INC
DOI: 10.1016/j.metabol.2017.06.001

Keywords

Collagen; Bone fragility; Blue sclerae; Atypical fracture; Zebra sign

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Osteogenesis imperfecta ((DI) is the most common inherited form of bone fragility and includes a heterogenous group of genetic disorders which most commonly result from defects associated with type 1 collagen. 85%-90% of cases are inherited in an autosomal dominant manner and are caused by mutations in the COL1A1 and COL1A2 genes, leading to quantitative or qualitative defects in type 1 collagen. In the last decade, defects in several other proteins involved in the normal processing of type 1 collagen have been described. Recent advances in genetics have called for reconsideration of the classification of OI, however, most recent classifications align with the classic clinical classification by Sillence. The hallmark of the disease is bone fragility but other tissues are also affected. Intravenous bisphosphonates (BPs) are the most widely used intervention, having significant favorable effects regarding areal bone mineral density (BMD) and vertebral reshaping following fractures in growing children. BPs have a modest effect in long bone fracture incidence, their effects in adults with OI concerns only BMD, while there are reports of subtrochanteric fractures resembling atypical femoral fractures. Other therapies showing promising results include denosumab, teriparatide, sclerostin inhibition, combination therapy with antiresorptive and anabolic drugs and TGF-beta inhibition. Gene targeting approaches are under evaluation. More research is needed to delineate the best therapeutic approach in this heterogeneous disease. (C) 2017 Elsevier Inc. All rights reserved.

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