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The Use of Bone Age in Clinical Practice – Part 2

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The Use of Bone Age in Clinical Practice – Part 2 Mini Review HORMONE Horm Res Paediatr 2011;76:10–16 Received: March 25, 2011 RESEARCH IN DOI: 10.1159/000329374 Accepted: May 16, 2011 PÆDIATRIC S Published online: June 21, 2011 The Use of Bone Age in Clinical Practice – Part 2 a d f e b David D. Martin Jan M. Wit Ze’ev Hochberg Rick R. van Rijn Oliver Fricke g h j c George Werther Noël Cameron Thomas Hertel Stefan A. Wudy i k a a Gary Butler Hans Henrik Thodberg Gerhard Binder Michael B. Ranke a b Pediatric Endocrinology and Diabetology, University Children’s Hospital, Tübingen , Children’s Hospital, c University of Cologne, Cologne , and Paediatric Endocrinology and Diabetology, Justus Liebig University, Giessen , d e Germany; Department of Pediatrics, Leiden University Medical Center, Leiden , and Department of Radiology, f Emma Children’s Hospital/Academic Medical Center Amsterdam, Amsterdam , The Netherlands; Meyer Children’s g Hospital, Rambam Medical Center, Haifa , Israel; Department of Endocrinology, Royal Children’s Hospital h Parkville, Parkville, Vic. , Australia; Centre for Global Health and Human Development, Loughborough University, i Loughborough , and Institute of Child Health, University College London and University College London Hospital, j k London , UK; H.C. Andersen Children’s Hospital, Odense University Hospital, Odense , and Visiana, Holte , Denmark Key Words ness and cortical thickness should always be evaluated in -Skeletal maturity ؒ Bone age ؒ Tall stature ؒ relation to a child’s height and BA, especially around puber Precocious puberty ؒ Congenital adrenal hyperplasia ؒ ty. The use of skeletal maturity, assessed on a radiograph Bone mineral density alone to estimate chronological age for immigration author- ities or criminal courts is not recommended. Copyright © 2011 S. Karger AG, Basel Abstract If height-limiting treatment is being considered for a child with tall stature, skeletal maturity is invaluable in the se- Introduction lection of appropriate patients for treatment, determining appropriate age of treatment commencement, monitoring Part 1 of this review dealt with the following themes: progress of treatment, and determining the expected treat- the negligible radiation dose involved in the hand-wrist ment effect on adult height. In precocious puberty, bone radiograph required to assess bone maturation [also maturation can be usefully assessed at initial diagnosis and called skeletal maturity, or bone age (BA)], the various start of treatment and at regular intervals thereafter during methods of assessment currently employed in clinical treatment monitoring. Together with height, bone matura- routine, and the use of such assessment in children with tion is an essential parameter for long-term treatment mon- short stature of various etiologies. Part 2 deals with the itoring in congenital adrenal hyperplasia. Bone age (BA) de- use of bone maturation films in children with tall stature, termination in children with skeletal dysplasia is only feasible precocious puberty (PP), congenital adrenal hyperplasia in a few disorders and estimations should be treated with (CAH), skeletal dysplasias, and unknown chronological caution. Radiographs of the left hand and wrist are, however, age, and with the possibility of using BA to evaluate bone essential in the diagnosis of many skeletal disorders. Bone mineral density and a possible secular trend. mineralization and measures of bone lengths, width, thick- © 2011 S. Karger AG, Basel Dr. David D. Martin 1663–2818/11/0761–0010$38.00/0 Pediatric Endocrinology and Diabetology, University Children’s Hospital Fax +41 61 306 12 34 Hoppe-Seyler Strasse 1 E-Mail [email protected] Accessible online at: DE–72076 Tübingen (Germany) www.karger.com www.karger.com/hrp Tel. +49 707 1298 3795, E-Mail david.martin @ med.uni-tuebingen.de T a l l S t a t u r e In an Australian study, adult height, compared to Bay- ley-Pinneau predictions derived from the Greulich-Pyle In some countries, children with extreme tall stature Atlas, was underestimated by a mean of 1.86 (8 0.18) cm have the (controversially discussed) option of treatment in the untreated group while the treated group ended up with sex steroids to accelerate epiphyseal fusion or of 2.13 ( 8 0.2) cm below their pretreatment prediction. Mul- growth plate drilling to limit adult height. Bone matura- tivariate regression showed that pretreatment skeletal tion estimates as a means to assess residual growth po- maturity strongly predicted outcome. To remove bias in tential is invaluable in the clinical and research situation the height prediction model, a matched-pair analysis regarding tall stature, for: based on adult height prediction allowed 108 treated and (1) selection of appropriate patients for treatment, untreated pairs to be matched. A treatment effect of 2.4 (2) determining appropriate time for treatment com- cm (95% CI –3.2 to 1.8) reduction in adult height was de- mencement, termined, and pretreatment BA again strongly predicted (3) monitoring progress of treatment, and outcome, with a 6-cm reduction if treatment in girls com- (4) determination of treatment effect on adult height. mences at BA 10, and a 1-cm reduction for each later BA The relationship between bone maturation and height ‘year’ of commencement [4] . must be considered: tall children will be expected to have In a retrospective study from Tübingen comprising a slightly advanced BA, in accordance with their ‘advance- daily oral dose of 7.5 mg conjugated estrogens (plus 5 mg ment’ in height. dydrogesterone for 10 days a month), the mean corrected In a comparison of adult height prediction methods effect of height-reducing therapy in girls was 3.6 cm used on children with tall stature, Joss et al. [1] concluded (range: 11.9 to –3.3 cm) compared with untreated girls. that there is no best or most accurate method for predict- Treatment was well tolerated [2] . In boys, using 500 mg ing adult height in tall children: both the Tanner-White- testosterone enanthate intramuscularly every 2 weeks [2] , house mark II and the Bayley-Pinneau method tend to the mean corrected effect of height-reducing therapy was overestimate adult height at various BAs, especially the 4.4 cm (range: 14.2 to –5.2 cm). Therapy was significant- Bayley-Pinneau method up to a bone maturation of 12 ly more effective when started at an earlier chronological ‘years’ in boys and 14 ‘years’ in girls. Binder et al. [2] found age and BA, with only 1 cm benefit when starting at a BA an overprediction of the Bayley-Pinneau method of only of 13.5 in girls and 14.5 in boys – in line with Drop and 0.14 cm (8 3.10) in girls and of 1.86 cm ( 8 4.37) in boys. colleagues [5] who actually found a negative effect over Early high-dose treatment with estrogen (for girls) or predicted adult height in boys who began treatment with testosterone (for boys) was found to reduce adult height by a BA of more than 14 ‘years’. There is as yet no consensus between 2 and 10 cm in the mostly small follow-up studies as to when treatment should be stopped: while Brämswig between the 1950s and the 1990s, which were mainly et al. [6] advocated and still practice [J. Brämswig, pers. based on bone maturation-derived height predictions. commun.] a treatment duration of 6 months only, others In a large retrospective Dutch study of girls who all have recommended not to discontinue therapy before had a predicted adult height above 181 cm, the total mean complete closure of the epiphyses of the hand has oc- (SEM) reduction of adult height was 5.9 (0.2) 5.3 (0.1), and curred to avoid considerable posttreatment growth [5] , 4.4 (0.2) cm when treated with 0.5, 0.25, and 0.1 mg ethi- and still others base stopping treatment on height veloc- nyl estradiol per day, respectively. Group 1 (n = 263) was ity only. Recently, reports from Australia [7] and the treated for 2.02 (0.03) years, group 2 (n = 178) for 1.85 Netherlands [8] indicated that estrogen treatment in ado- (0.04) years, and 3 (n = 98) for 1.63 (0.05) years. When lescence may be associated with an increased likelihood expressed in relation to the treatment period, the reduc- of fertility problems, which further discourages the use tion of adult height was 3.0 (0.1), 3.1 (0.1), and 2.9 (0.2) cm/ of estrogens for this indication. In men, androgen treat- year of treatment, respectively. All the girls were treated ment of tall stature does not seem to affect fatherhood or with ethinyl estradiol as a daily single dose, while proges- semen quality but serum testosterone levels are reduced togen was given daily the first 10 days of every month. [9] . Hence 0.1 mg ethinyl estradiol daily for about 20 months In conclusion, the need for growth attenuation treat- was sufficient to reduce adult height. Here the recom- ment of adolescents with tall stature is limited and long- mendation was made to start treatment at a bone matura- term adverse effects have been reported so that treat- tion of about 12 ‘years’ [3] – although with very tall girls ment is not recommended in most cases. However, pedi- one should begin earlier to achieve a worthwhile effect. atric endocrinologists are regularly faced with patients Bone Age in Clinical Practice – Part 2 Horm Res Paediatr 2011;76:10–16 11 wanting a reduction of adult height and may still con- examination of the uterus and gonads, and hormone sider this treatment or alternative treatments such as tests. surgical epiphysiodesis in extreme cases. A BA assess- Since in PP the premature exposure to sex hormones ment is of invaluable help in assisting the decision-mak- accelerates bone maturation, a skeletal maturity assess- ing process.
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