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The Ever-Expanding Conundrum Of Stagi et al. Italian Journal of Pediatrics 2014, 40:55 http://www.ijponline.net/content/40/1/55 ITALIAN JOURNAL OF PEDIATRICS REVIEW Open Access The ever-expanding conundrum of primary osteoporosis: aetiopathogenesis, diagnosis, and treatment Stefano Stagi1*, Loredana Cavalli2, Salvatore Seminara1, Maurizio de Martino1 and Maria Luisa Brandi2 Abstract In recent years, as knowledge regarding the etiopathogenetic mechanisms of bone involvement characterizing many diseases has increased and diagnostic techniques evaluating bone health have progressively improved, the problem of low bone mass/quality in children and adolescents has attracted more and more attention, and the body evidence that there are groups of children who may be at risk of osteoporosis has grown. This interest is linked to an increased understanding that a higher peak bone mass (PBM) may be one of the most important determinants affecting the age of onset of osteoporosis in adulthood. This review provides an updated picture of bone pathophysiology and characteristics in children and adolescents with paediatric osteoporosis, taking into account the major causes of primary osteoporosis (PO) and evaluating the major aspects of bone densitometry in these patients. Finally, some options for the treatment of PO will be briefly discussed. Keywords: Bone mineral density, Children, Fragility fractures, Osteopoenia, Osteoporosis, Primary osteoporosis Introduction Thus, the achievement of an optimal PBM includes mea- Recently, as knowledge regarding the aetiopathogenetic sures to block reductions in bone apposition or to increase mechanisms of many diseases affecting bone health has bone remodelling and bone accrual. increased and the diagnostic techniques for evaluating Primary osteoporosis in children occurs due to an in- bone status have improved, the problem of low bone trinsic bone abnormality (Primary Osteoporosis, PO) that mass/quality in children and adolescents has received in- is usually genetic in origin, whereas secondary osteo- creased attention, revealing evidence of groups of children porosis arises from an underlying medical condition or its who may be at risk of osteoporosis [1,2]. This interest is treatment [9]. In these forms, osteoporosis could be re- linked to an increased understanding that a higher peak lated to 1) failure to achieve optimal PBM in adolescence, bone mass (PBM) may be one of the most important de- 2) excessive resorption of bone, or 3) failure to adequately terminants affecting the age of onset of osteoporosis in replace the resorbed bone through a bone formation de- adulthood [3,4]. Early diagnosis and therapeutic interven- ficit. Although PO is defined by decreased bone strength tion are fundamental for ensuring better bone health in that predisposes individuals to fragility fractures, we have adulthood. For example, data gathered from 22q11 Dele- poor long-term follow-up data on bone health in many of tion Syndrome patients suggests that a reduction in bone the PO disorders, as well as on bone characteristics, accretion could lead to a pathologically reduced bone growth, quality, and density in the pubertal or post- mass in young adults [5]. Alternatively, many studies have pubertal periods, on PBM, and on the effects of nutritional shown that specific types of physical exercise undertaken interventions or pharmacological treatments. In order to during childhood and adolescence may determine bone understand these issues, it is necessary to know the spe- health in adulthood, most likely by increasing PBM [6-8]. cific anatomical and physiological bone characteristics of children, in addition to the peculiarities in the diagnostic * Correspondence: [email protected] evaluation of bone density or quality. Because inadequate 1Health Sciences Department, University of Florence, Anna Meyer Children’s acquisition of bone in childhood and adolescence may University Hospital, Florence, Italy lead to an increased lifetime risk of osteoporosis and Full list of author information is available at the end of the article © 2014 Stagi et al.; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. Stagi et al. Italian Journal of Pediatrics 2014, 40:55 Page 2 of 18 http://www.ijponline.net/content/40/1/55 fracture, it is important to recognise whether bone min- Table 1 Causes of primacy osteoporosis in children and eral status is affected in children with PO. adolescents This review provides an updated picture of the patho- Diseases Genes physiological basis of the main forms of PO in children Osteogenesis imperfecta COL1A1; COL1A2; IFITM5; SERPINF1; and adolescents, taking into account the most common CRTAP; LEPRE1; PPIB; FKBP10; BMP1; among the rare syndromes causing PO and evaluating SP7; SERPINH1; WNT1; TMEM38B the main aspects of bone densitometry in these patients. X-linked hypophoshatemic PHEX rickets Finally, treatment options for the various forms of PO are briefly discussed. Homocystinuria CBS Hypophosphatasia ALPL Primary osteoporosis Wilson’s disease ATP7B The primary forms of osteoporosis in childhood are rela- Menkes’ kinky hair syndrome ATP7A tively rare, and some of them are familial or genetically Osteoporosis-pseudoglioma LRP5 determined (Table 1). The most common primary bone syndrome disorder leading to PO is osteogenesis imperfecta (OI), a Idiopathic juvenile osteoporosis - structural genetic defect in the quantity or quality of bone Juvenile Paget’s disease OPG type 1 collagen production [10]. OI has several subtypes, ’ ranging from mild forms to a form that causes intrauter- Early-onset Paget s disease RANK ine foetal death. Family history, the blue, purple, or grey Ehler–Danlos syndrome COL5A2; COL5A1; COL1A1; COL3A1; PLOD1; COL1A2; ADAMTS2; COL3A1; sclera commonly observed in this disorder, radiographic TNXB findings, and in some cases, bone biopsy, are used to Bruck syndrome FKBP10; PLOD2 establish the diagnosis of the genetic disorder. Other causes of PO include idiopathic juvenile osteopo- Marfan syndrome FBN1 rosis (IJO), osteoporosis-pseudoglioma syndrome (OPPG), Hypophosphatemic SLC34A1; NPHLOP2 nephrolithiasis/osteoporosis and X-linked hypophosphatemic rickets (XLH) [11]. En- zymatic defects such as hypophosphatasia and homo- Hajdu-Cheney syndrome NOTCH2 cystinuria as well as disorders of copper transport such Torg-Winchester syndrome MMP2 as Wilson’s disease and Menkes’ kinky hair syndrome Shwachman-Diamond syndrome SBDS can also lead to osteoporosis or severe demineralisation Singleton-Merten syndrome - [12,13]. Finally, some genetic syndromes, such as Marfan Cleidocranial dysostosis RUNX2 and Ehler–Danlos syndrome, or more rare genetic Stuve-Wiedemann syndrome LIFR diseases such as Hajdu-Cheney, Torg-Winchester and Shwachman-Diamond syndromes, are associated with an Cole-Carpenter syndrome - impairment of bone mass or quality. Geroderma osteodysplasticum GORAB Noonan syndrome PTPN11; SHOC2; KRAS; SOS1; RAF1; Osteogenesis imperfecta NRAS; BRAF; RIT1 OI, or brittle bone disease, a rare heritable connective Neonatal hyperparathyroidism CASR tissue disorder, is classified as a form of osteoporosis, Other forms of SLC34A3; FGF23; DMP1; ENPP1; CLCN5 even if the primary defect is genetically altered structure hypophosphatemic rickets of type I collagen composing the bone matrix [14]. Typi- Hypocalcemic rickets VDR; CYP2R1; CYP27B1 cal features of OI are multiple peripheral and vertebral Note. This table lists only the most frequent diseases associated with primary compression fractures, blue sclera, excessive joint laxity, osteoporosis according to the recent literature. dentinogenesis imperfecta, and hearing loss [14]. The original classification by Sillence based on phenotypic features consisted of four types that vary in severity [15]. OI type IV, which is similar to the other forms, is be- OI has a birth prevalence of approximately 6 to 7 in lieved to be rare. 100,000 [16], differing by type, with OI type I and OI OI is usually characterised by autosomal dominant in- type IV accounting for more than half of all OI cases heritance (95% of cases), but some cases are related to [16]. OI type I has a prevalence of 3 to 4 per 100,000 autosomal recessive traits or to a spontaneous mutation and an incidence of 3.5 per 100,000, whereas the inci- [15,17] (Table 2). The OI type I (OMIM #166200)pheno- dence of OI type II is approximately 1 to 2 per 100,000 type can be produced by a mutation in either COL1A1 (the prevalence is not available due to early lethality) (OMIM +120150)orCOL1A2 (OMIM *120160), and pos- [15,16]. Finally, OI type III has an incidence of 1.6 per sibly in other genes. Type II OI (OMIM #166210) is lethal 100,000 and a prevalence of 1 to 2 per 100,000 [15,16]. in the perinatal period. Type III (OMIM #259420)isa Stagi et al. Italian Journal of Pediatrics 2014, 40:55 Page 3 of 18 http://www.ijponline.net/content/40/1/55 Table 2 Causes of osteogenesis imperfecta, involved genes, location, inheritance, and gene products Osteogenesis imperfecta OMIM Inheritance Gene Location Gene product Type I 166200 AD COL1A1 17q21.33 Collagen, Type I, Alpha-1 Type II 166210 AD COL1A1 17q21.33
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