Hands B, Chivers P, McIntyre F, Bervenotti F C, Blee T, Beeson B, Bettenay F, Siafarikas A
Institute for Health Research, The University of Notre Dame Australia, 19 Mouat Street, PO Box 1225, Fremantle, WA, 6959, Australia.
School of Health Science, The University of Notre Dame Australia, 19 Mouat Street, PO Box 1225, Fremantle, WA, 6959, Australia.
Osteoporos Int. 2015 Jun;26(6):1809-18. doi: 10.1007/s00198-015-3071-8. Epub 2015 Mar 10.
This is the first reported study to describe local bone mineral density, assess parameters of fracture risk and report history of fractures in adolescents with motor difficulties. Motor difficulties evidenced by poor coordination in adolescence should be considered a new risk factor for below-average bone strength and structure and fracture risk.
Adolescents with motor difficulties are characterised by poor coordination and low levels of physical activity and fitness. It is possible these deficits translate into below-average bone strength and structure. The objectives of this study were to describe local bone mineral density (BMD), assess parameters of fracture risk (stress-strain index, SSI) and report history of fractures in this group.
Thirty-three adolescents (13 females), mean age of 14.3 (SD = 1.5) years, with motor difficulties underwent peripheral quantitative computed tomography (pQCT) measurements at proximal (66 %) and distal (4 %) sites of the non-dominant radius (R4 and R66) and tibia (T4 and T66). One sample t test was used to compare Z-scores for total BMD, trabecular density, cortical density and stress strain index (SSI) against standardized norms.
Significant differences were present at R4 total density mean Z-score = -0.85 (SD = 0.7, p < 0.001), R66 cortical density mean Z-score = -0.74 (SD = 1.97, p = 0.038), R66 SSI mean Z-score = -1.00 (SD = 1.08, p < 0.001) and T66 SSI mean Z-score = -0.70 (SD = 1.15, p < 0.001). There was a higher incidence of fractures (26.9 %) compared to the normal population (3-9 %).
Motor difficulties in adolescence should be considered a risk factor for below-average bone strength and structure and fracture risk. Strategies are needed to improve bone health in this high-risk-group.
这是第一项报告的研究，旨在描述局部骨矿物质密度，评估骨折风险参数，并报告有运动困难的青少年的骨折史。青少年时期协调能力差所证明的运动困难应被视为骨强度和结构低于平均水平以及骨折风险的一个新的危险因素。
有运动困难的青少年的特点是协调性差、身体活动和健康水平低。这些缺陷有可能转化为低于平均水平的骨强度和结构。本研究的目的是描述该组青少年的局部骨矿物质密度（BMD），评估骨折风险参数（应力应变指数，SSI），并报告骨折史。
33名青少年（13名女性），平均年龄14.3（标准差=1.5）岁，有运动困难，在非优势桡骨（R4和R66）和胫骨（T4和T66）的近端（66%）和远端（4%）部位进行了外周定量计算机断层扫描（pQCT）测量。使用单样本t检验将总骨密度、小梁密度、皮质密度和应力应变指数（SSI）的Z分数与标准化规范进行比较。
在R4总密度平均Z分数=-0.85（标准差=0.7，p<0.001）、R66皮质密度平均Z分数=-0.74（标准差=1.97，p=0.038）、R66 SSI平均Z分数=-1.00（标准差=1.08，p<0.001）和T66 SSI平均Z分数=-0.70（标准差=1.15，p<0.001）处存在显著差异。与正常人群（3%-9%）相比，骨折发生率更高（26.9%）。
青少年的运动困难应被视为骨强度和结构低于平均水平以及骨折风险的一个危险因素。需要采取策略来改善这个高危群体的骨骼健康。
