Bone geometry and volumetric bone mineral density in girls with Turner syndrome of different pubertal stages
Abstrakt
P>Objective An increased rate of fractures has been reported in patients with Turner syndrome (TS). We aimed to assess bone geometry and volumetric bone mineral density (vBMD) at the radius in girls with TS and to evaluate the relationships between bone parameters and fracture history.
Methods and design Sixty-seven girls with TS aged 6-19 years treated currently or in the past with growth hormone (GH) and/or oestrogens were examined using peripheral quantitative computed tomography. Results were compared to reference data.
Results Cortical area and cortical thickness were low in all age groups (all P < 0 center dot 001). Height-adjusted total bone area at the diaphysis was increased in prepubertal and postpubertal girls (mean Z-score 1 center dot 0, P < 0 center dot 05 for both) and normal in the pubertal group (mean Z-score 0 center dot 1).
Cortical vBMD was decreased (mean age-specific Z-scores -2 center dot 0, -1 center dot 6 and -1 center dot 0 for prepubertal, pubertal and postpubertal groups, respectively, P < 0 center dot 01 for all groups). Height- , age- and cortical thickness-adjusted cortical vBMD was positively correlated to the duration of GH therapy (P = 0 center dot 012) and to oestrogen administration (P = 0 center dot 047).
Girls with a history of fractures had lower total vBMD at the metaphysis compared to nonfractured TS girls (mean Z-scores -1 center dot 7 vs -0 center dot 9, P = 0 center dot 04). Conclusions There is a cortical bone deficit in girls with TS characterized by low cortical area, thin cortex and probably decreased cortical vBMD.
Early commencement of GH therapy, as well as oestrogen replacement, is associated with higher cortical vBMD. Further studies should investigate the potential causality of this relation.