Case-control analysis of bone resorption markers, disability, and hip fracture risk: the Rotterdam study

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Abstract
Several factors besides bone mineral mass have been related to the risk of hip fracture. Bone quality, the rate of bone loss, and non-skeletal factors have been identified as important.1 2 High rates of bone resorption may be associated with disruption of the trabecular network as well as with an increased rate of bone loss. Furthermore, immobility associated with disability induces bone resorption not followed by increased bone formation.3 Urinary pyridinium crosslinks are markers of bone resorption. We investigated whether these were associated with the risk of hip fracture and also whether such an association was attributable to disability. This nested case-control analysis was conducted as part of the Rotterdam study, a prospective cohort study of the incidence of and risk factors for chronic disabling diseases.4 Briefly, all 10275 residents of a district of Rotterdam aged 55 or over were invited to participate. The study consisted of an initial home interview followed by a series …