Biomechanical analysis of arm fracture in obese boys.
OBJECTIVE
To determine the role of the biomechanical factors of force of impact, bone strength, fall height and surface stiffness on the risk of forearm fracture in obese children compared to non-obese children.


METHODS
Anthropometric and dual-energy X-ray absorptiometry bone density data from 50 boys (25 obese pair-matched with 25 non-obese subjects) aged 4-17 years were entered into a rheological-stochastic simulation model of arm impact.


RESULTS
Obese children were shown to be at 1.7 times greater risk of fracture compared to non-obese children. Lower fall heights and softer impact surfaces were found not to reduce the relative risk of fracture between obese and non-obese children.


CONCLUSIONS
Environmental modifications are unlikely to lower the risk of arm fracture in obese children to the same levels experienced by non-obese children. The best option available for obese children to reduce fracture risk is to take steps to attain a healthy bodyweight.
Davidson
P L
PL
Injury Prevention Research Unit, Department of Preventive and Social Medicine, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand. peter.davidson@ipru.otago.ac.nz
Goulding
A
A
Chalmers
D J
DJ
D000058:Accidental Falls / Q000706:statistics & numerical data; D000293:Adolescent; D000367:Age Factors; D000886:Anthropometry; D001134:Arm Injuries / Q000175:diagnosis* / Q000453:epidemiology; D001696:Biomechanical Phenomena; D015992:Body Mass Index; D016022:Case-Control Studies; D002648:Child; D002675:Child, Preschool; D005500:Follow-Up Studies; D017102:Fracture Healing / Q000502:physiology*; D050723:Fractures, Bone / Q000175:diagnosis* / Q000453:epidemiology / Q000628:therapy; D006801:Humans; D015601:Injury Severity Score; D008297:Male; D009520:New Zealand; D009765:Obesity / Q000175:diagnosis* / Q000453:epidemiology; D012016:Reference Values; D018570:Risk Assessment; D012680:Sensitivity and Specificity; D012737:Sex Factors