Two-year Longitudinal Changes in Forearm Cortical Bone Geometry in Postmenopausal Women with Mild Primary Hyperparathyroidism without Parathyroidectomy

 

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Abstract

Several studies suggest that mild PTH excess does not have any deteriorative effects on bone mineral density (BMD) in several-year-longitudinal studies of patients with mild primary hyperparathyroidism (pHPT) without parathyroidectomy (PTX). However, it remains unknown about the change in bone geometry in pHPT patients without PTX. We examined the longitudinal effects of mild PTH excess on cortical bone geometry in postmenopausal patients with mild pHPT without PTX by using peripheral quantitative computed tomography (pQCT), and we compared them with normal and hypoparathyroidism women. Nine postmenopausal female patients who were diagnosed as pHPT, six postmenopausal female patients with hypoparathyroidism (3 idiopathic and 3 postoperative), and thirty postmenopausal control subjects participated in this study. Radial volumetric (v) BMD and several bone geometry parameters were measured by pQCT at basal line and after 2 years. Cortical vBMD was significantly lower in pHPT group. Moreover, total area and periosteal circumferences were significantly higher in pHPT group. Total and cortical vBMD were significantly decreased after 2 years in control group. However, they were stable in pHPT group after 2-year follow-up. As for bone geometry, cortical thickness and area were also stable in pHPT group during 2-year follow-up, although they were significantly reduced in control group and hypoparathyroidism group. In conclusion, the present longitudinal study revealed that there were no significant changes in radial vBMD and cortical bone geometry in postmenopausal women with mild pHPT, whereas age-related thinning of cortical bone as well as decrease of vBMD were observed in the control and patients with hypoparathyroidism.

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Correspondence

H. Kaji

Division of Diabetes, Metabolism and Endocrinology

Department of Internal Medicine

Kobe University Graduate School of Medicine

7-5-2 Kusunoki-cho

Chuo-ku

650-0017 Kobe

Japan

Phone: 81/78/382 58 61

Fax: 81/78/382 20 80

Email: hiroshik@med.kobe-u.ac.jp