Regional Variation in Bone Mineral Density and Motor Function in Children with Cerebral Palsy.

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Bone mineral density (BMD) and motor activity of the upper extremities, were studied in 18 children with spastic cerebral palsy (CP group) and 12 age-matched normal boys (control group). The motor activity was monitored by a piezoelectric transducer. Whole body BMD as well as BMD of the head, upper limbs, ribs, spine, pelvis, and lower limbs was evaluated by dual energy x-ray absorptiometry. In the CP group, BMDs were lower compared to control group in the whole body and in all the body regions (except for the head) especially in the pelvis and lower limbs. BMDs of these regions were higher in walking patients than in bed-ridden, rolling, and crawling patients. Motor activities in the upper extremities were lower in the CP than in the control group. BMD increased with developing motor activity in the upper extremities. These results implicate diminished BMDs of the lower limbs and pelvis, which are associated with standing and walking, to the high incidence of femur fractures in CP.
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