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Search for hidden secondary causes in postmenopausal women with osteoporosis

Cerdá Gabaroi, Dacia MD1; Peris, Pilar MD, PhD2; Monegal, Ana MD, PhD2; Albaladejo, Carolina MD3; Martínez, Ma Ángels MD2; Muxí, África MD4; Martínez de Osaba, Ma Jesús MD5; Surís, Xavier MD1; Guañabens, Núria MD, PhD2

doi: 10.1097/gme.0b013e3181ade8e5
Articles

Objective: The prevalence of secondary processes in women with postmenopausal osteoporosis (OP) is not well known. The aim of this study was to analyze the prevalence of conditions contributing to bone loss in postmenopausal women with OP and to evaluate the clinical characteristics and the impact of these disorders on the severity of the disease.

Methods: A total of 204 postmenopausal women (mean ± SD age, 64.9 ± 10 y) with OP were prospectively included. None had an evident secondary cause of OP. Bone mineral density assessment, spine x-ray, and laboratory tests including parathormone (PTH), 25-hydroxyvitamin D (25OHD), thyroid hormones, urinary N-terminal cross-linked telopeptide of type I collagen (NTx), and 24-hour urinary calcium and cortisol were performed in all participants before treatment.

Results: As a group, 82% had low 25OHD levels (<30 ng/mL), 35% had increased PTH levels (>65 pg/mL), and 20% had hypercalciuria (>250 mg/24 h). In addition, 41% had increased NTx urinary levels (>65 nmol/mmol). PTH levels were related to age and were higher in women with femoral Z score less than −2.0 (80.3 pg/mL vs 57.7 pg/mL; P = 0.03). Participants with increased urinary NTx showed lower lumbar T and Z scores, whereas women with low 25OHD levels had lower femoral neck bone mineral density and T score values. In addition, participants with vertebral fractures had higher prevalence of 25OHD levels less than 20 ng/mL (69.2% vs 53.4%; P < 0.05).

Conclusions: Secondary processes that contribute to low bone mass in postmenopausal women with OP are frequent, especially vitamin D insufficiency, increased PTH values, and hypercalciuria. In addition, increased bone resorption is frequently observed in this group of women. Most of these processes contributed to the severity of the disease.

Secondary processes that contribute to low bone mass in postmenopausal women with osteoporosis are frequent. Most of these processes contribute to the severity of the disease.

From the 1Rheumatology Unit, Department of Internal Medicine, Hospital General de Granollers, Granollers; 2Rheumatology Department, Service of Rheumatology, ICEMEQ, Metabolic Bone Disease Unit, IDIBAPS, Hospital Clinic, University of Barcelona; 3Rheumatology Unit CAP Manso; and 4Department of Nuclear Medicine and 5Hormonal Laboratory, Service of Clinical Biochemistry, IDIBAPS, Hospital Clínic, University of Barcelona, Barcelona, Spain.

Received March 29, 2009; revised and accepted May 12, 2009.

Financial disclosure/conflicts of interest: None reported.

Address correspondence to: Dacia Cerdá Gabaroi, MD, Rheumatology Unit, Department of Internal Medicine, Hospital General de Granollers, c/o Francesc Ribas s/n, 08402 Granollers, Barcelona, Spain. E-mail: 32318mcg@comb.es

©2010The North American Menopause Society