Fracture rate, pre- and postmenopausal bone mass and early and late postmenopausal bone loss are not associated with vitamin D receptor genotype in a high-endemic area of osteoporosis.

Abstract

To investigate a possible association between vitamin D receptor genotype and development of postmenopausal osteoporosis, a longitudinal study from 1977 to 1995 was carried out on women living in Oslo, Norway. One hundred and eighteen premenopausal women born in 1930 were included in a study of pre- and postmenopausal bone loss in 1977. In 1995, blood samples for vitamin D receptor genotyping were available in 72, 42 and 49 of the women eligible for the determination of premenopausal bone mineral content, early postmenopausal appendicular bone loss and late postmenopausal bone mineral content, bone loss and fractures, respectively. Bone mineral density was measured in the distal and proximal right forearm annually from 1977 to 1987, and in the lumbar spine, proximal femur, right forearm and total body, including ultrasound measurements of the right calcaneus, in 1993 and 1995. Non-spinal fractures were also recorded. The results were compared to the individual vitamin D receptor genotype and it was found that vitamin D receptor genotype was neither associated with non-spinal fractures, pre- and post-menopausal bone mass nor with early and late postmenopausal bone loss within the age of 65 years. In conclusion, premenopausal bone mass, postmenopausal bone loss and the subsequent risk of osteoporosis and fractures were not predicted by vitamin D receptor genotype in a high-endemic area of osteoporosis.