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Bone mineral density in middle-aged women with Turner's syndrome

Sylvén L, Hagenfeldt K, Ringertz H. Bone mineral density in middle-aged women with Turner's syndrome. Eur J Endrocrinol 1995;132:47–52. ISSN 0804–4643

Bone mineral density (BMD), bone mineral content and body composition were determined in 47 middle-aged (mean age 47.9 ± 1.1 years) women with Turner's syndrome. Bone mineral density was measured in the forearm, femoral neck and total body. The women investigated had a BMD lower than the normal mean. When expressed as Z scores (individual values compared to normal reference data matched for age, weight and sex), the median Z score of the total body was –1.23. When comparing women with the karyotype 45,X and mosaic women, the latter showed a higher BMD in all sites of measurement. Duration of hormonal replacement therapy (HRT) differed significantly between the mosaic and the 45,X women, with a longer duration in the mosaic group (20.7 ± 2 vs 12.1 ± 2.6 years; p < 0.01). The duration of HRT was found to be the more important factor to maintain bone mass, not the karyotype. Bone mineral density increased with years of HRT but not until after > 20 years of HRT could a significant difference be shown between the women with HRT 20 years and those with HRT > 20 years. No correlation was found between BMD and body weight, body fat or percentage body fat. Whether the osteopenia found in women with Turner's syndrome is similar to that found postmenopausally or is a specific form related to the chromosome aberration remains to be investigated further. The present data support a relation to estrogen deficiency.

Lisskulla Sylvén, Department of Woman and Child Health, Division for Obstetrics & Gynecology, Karolinska Hospital, S-171 76 Stockholm, Sweden

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