Bone mineral density and body composition in boys with distal. forearm fractures: A dual-energy x-ray absorptiometry study

Objective: To determine whether boys with distal forearm fractures differ f rom fracture-free control subjects in bone mineral density (BMD) or body co mposition. Study design: A case-control study of 100 patients with fractures (aged 3 t o 19 years) and 100 age-matched fracture-free control subjects was conducte d. Weight, height, and body mass index were measured anthropometrically. BM D values and body composition were determined by dual-energy x-ray absorpti ometry. Results: More patients than control subjects (36 vs 14) were overweight (bo dy mass index > 85th percentile for age, P < .001). Patients had lower area l (a BMD) and volumetric (BMAD) bone mineral density values and lower bone mineral content but more fat and less lean tissue than fracture-free contro l subjects. The ratios (95% Cls) for all case patients/control subjects in age and weight-adjusted data were ultradistal radius a BMD 0.94 (0.91-0.97) ; 33% radius a BMD 0.96 (0.93-0.98) and BMAD 0.95 (0.91-0.99); spinal L2-4 BMD 0.92 (0.89-0.95) and BMAD 0.92 (0.89-0.94); femoral neck a BMD 0.95 (0. 92-0.98) and BNL-XD 0.95 (0.91-0.98); total body a BMD 0.97 (0.96-0.99), Ca t mass 1.14 (1.04-1.24), lean mass 0.96 (0.93-0.99), and total body bone mi neral content 0.94 (0.91-0.97). Conclusions: Our results support the view that low BMC, a BMD, and BMAD val ues and high adiposity are associated with increased risk of distal forearm fracture in boys. This is a concern, given the Increasing levels of obesit y in children today.