Prepubertal Girls With Turner Syndrome and Children With Isolated SHOX Deficiency Have Similar Bone Geometry at the Radius
Context: The low bone mineral density (BMD) and alterations in bone geometry observed in patients with Turner syndrome (TS) are likely caused by hypergonadotropic hypogonadism and/or by haploinsufficiency of the SHOX gene. Objective: Our objective was to compare BMD, bone geometry, and strength at t...
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Veröffentlicht in: | The journal of clinical endocrinology and metabolism 2013-07, Vol.98 (7), p.E1241-E1247 |
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Zusammenfassung: | Context:
The low bone mineral density (BMD) and alterations in bone geometry observed in patients with Turner syndrome (TS) are likely caused by hypergonadotropic hypogonadism and/or by haploinsufficiency of the SHOX gene.
Objective:
Our objective was to compare BMD, bone geometry, and strength at the radius between prepubertal girls with TS and children with isolated SHOX deficiency (SHOX-D) to test the hypothesis that the TS radial bone phenotype may be caused by SHOX-D.
Design and Setting:
This comparative cross-sectional study was performed between March 2008 and May 2011 in 5 large centers for pediatric endocrinology.
Patients:
Twenty-two girls with TS (mean age 10.3 years) and 10 children with SHOX-D (mean age 10.3 years) were assessed using peripheral quantitative computed tomography of the forearm.
Main outcomes:
BMD, bone geometry, and strength at 4% and 65% sites of the radius were evaluated.
Results:
Trabecular BMD was normal in TS (mean Z-score = −0.2 ± 1.1, P = .5) as well as SHOX-D patients (mean Z-score = 0.5 ± 1.5, P = .3). At the proximal radius, we observed increased total bone area (Z-scores = 0.9 ± 1.5, P = .013, and 1.5 ± 1.4, P = .001, for TS and SHOX-D patients, respectively) and thin cortex (Z-scores = −0.7 ± 1.2, P = 0.013, and −2.0 ± 1.2, P < .001, respectively) in both groups. Bone strength index was normal in TS as well as SHOX-D patients (Z-scores = 0.3 ± 1.0, P = .2, and 0.1 ± 1.3, P = .8, respectively).
Conclusions:
The similar bone geometry changes of the radius in TS and SHOX-D patients support the hypothesis that loss of 1 copy of SHOX is responsible for the radial bone phenotype associated with TS. |
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ISSN: | 0021-972X 1945-7197 |
DOI: | 10.1210/jc.2013-1113 |