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Generalized low bone mass of girls with adolescent idiopathic scoliosis is related to inadequate calcium intake and weight bearing physical activity in peripubertal period

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Abstract

Generalized low bone mass has been well documented in patients with adolescent idiopathic scoliosis (AIS). However, studies linking calcium-intake (CA), weight-bearing physical-activity (PA) and bone mass of AIS are lacking. We aimed to study the relationship between CA, PA and bone mass in AIS girls and compared to those of healthy non-AIS controls during the peripubertal period. Newly diagnosed AIS girls (n=596) aged 11–16 years with Cobb angle ≥10° were recruited to compare with age-matched healthy girls (n=302) in a cross-sectional study. Anthropometric parameters, pubertal status, CA and PA were assessed. Areal bone mass of lumbar spine and femoral neck, and volumetric bone mass of distal radius and tibia were determined by dual-energy X-ray absorptiometry and peripheral quantitative computed tomography, respectively. The results showed that weight and body mass index (BMI) of AIS were lower than the controls (P<0.05). Corrected height and arm span of AIS were longer than those of controls from 13 years onwards (P<0.02). Median CA of AIS was <410 mg/day across the ages and did not differ from the controls (P=0.063). Median PA of AIS (1.6 h/day) was lower than the controls (1.8 h/day) (P=0.025). Bone mass of AIS was on average 6.5% lower than controls across the ages (P<0.05). CA and PA were significantly correlated with bone mass of AIS (P<0.04). Multivariate analysis showed that AIS in girls was associated with lower bone mass, and that both CA and PA were independent predictors of bone mass in AIS. In conclusion, AIS girls were found to have lower body weight and BMI, longer segmental lengths and generalized low bone mass. Inadequate calcium intake and weight-bearing physical activity were significantly associated with low bone mass in AIS girls during the peripubertal period. The importance of preventing generalized osteopenia in the control of AIS progression during the peribubertal period warrants further study.

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Acknowledgements

We would like to express our gratitude to the patients and their parents, the Heads of school, students and parents from the participating schools; without their supports, our study would not have been successful. Thanks are also due to Mr. Jacky W.W. Chau, Miss Vivian Hung, Miss Christine Lee, Miss Catherine Li, Miss Sylvia Lam, Miss Elaine Au and Mr. Jason So for fieldwork assistance and data entry. Special thanks are also expressed to the Jockey Club Centre for Osteoporosis Care & Control, The Chinese University of Hong Kong for generous manpower support on this study. The study was supported by Research Grant Council (no. CUHK 4336/99M) & Health Service Research Grant (no. HSRF 921024), Hong Kong SAR.

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Correspondence to Jack C. Y. Cheng.

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Lee, W.T.K., Cheung, C.S.K., Tse, Y.K. et al. Generalized low bone mass of girls with adolescent idiopathic scoliosis is related to inadequate calcium intake and weight bearing physical activity in peripubertal period. Osteoporos Int 16, 1024–1035 (2005). https://doi.org/10.1007/s00198-004-1792-1

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  • DOI: https://doi.org/10.1007/s00198-004-1792-1

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