Forearm bone loss in hemiplegia: a model for the study of immobilization osteoporosis

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
R L PrinceS Ho

Abstract

Hemiplegia is associated with excessive bone loss in the paralyzed arm. The forearm bone mineral content was measured at a proximal cortical site and a distal trabecular site of both the normal and hemiplegic arms in 74 patients with hemiplegia. By comparing the ratios of bone mineral content in the two arms, the effect of immobilization could be quantitated independently of the large population variance in bone mineral content. Bone loss, estimated from this single comparison of bone mineral content in the normal and hemiplegic arms, at the trabecular and cortical sites was positively correlated with the duration of stroke and negatively correlated with reduction in forearm function. At the trabecular site females had a proportionately greater bone loss than males, indicating an interaction between gender and immobilization associated bone loss at this site. The regression line of excess bone loss in the hemiplegic limb against time had a negative slope of 1.3% and 1.5% a year of the starting value for the trabecular and cortical sites, respectively, over the 15 years studied. This study indicates that a reduction in function is associated with significant bone loss occurring over prolonged periods that may account, at least i...Continue Reading

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