Growth tracking of femoral and humeral strength from infancy through late adolescence
Growth tracking of femoral and humeral strength from infancy through late adolescence
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DOI：
10.1080/08035250510026535
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发表时间：
2005-01-01
期刊：
影响因子：
3.8
通讯作者：
Ruff, C
中科院分区：
文献类型：
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作者：
Ruff, C
目的：确定在整个生长期内，股骨和肱骨强度“跟踪”或保持在相对于其他个体的相同排名位置的程度。方法：对20例6月龄至17岁的个体，按性别平均分为6个月或每年测量一次X线片。截面模量是弯曲/扭转强度的测量值，来自股骨中段和肱骨远端40%骨长度处的皮质和骨膜下宽度。体型也被评估为体重和骨长度的乘积。以两种方式评价生长跟踪：每个年龄点的规格与17岁时的规格之间的斯皮尔曼等级顺序相关性，以及指定年龄间隔内等级的个体变化数量。所有分析均在性别内进行。结果：生长轨迹的程度因性别、骨骼位置和年龄而异。肱骨（r = 0.56-0.83）的相关性高于股骨（r = 0.10-0.63）。男性显示股骨跟踪特别差，最有可能是由于身体尺寸的晚期和可变的青少年生长突增。标准化的身体尺寸改善了男性股骨的跟踪，但对肱骨没有。在整个生长期内，个体平均5-8个可能的排名变化。幼儿园（
Aim: To determine to what degree femoral and humeral strengths "track", or remain at the same ranked position relative to other individuals during the entire growth period. Methods: Radiographs of 20 individuals, equally divided by sex, were measured at 6-mo or annual intervals from 6 mo to 17 y of age. The section modulus, a measure of bending/torsional strength, was derived from cortical and subperiosteal breadths taken at the femoral midshaft and at 40% of the bone length from the distal end of the humerus. Body size was also assessed as the product of body weight and bone length. Growth tracking was evaluated in two ways: as Spearman rank-order correlations between strengths at each age point and strengths at 17 y of age, and as the number of individual changes in rank over specified age intervals. All analyses were carried out within sex. Results: The degree of growth tracking varied by sex, skeletal location, and age. Correlations were higher for the humerus (r = 0.56-0.83) than for the femur (r = 0.10-0.63). Males showed particularly poor tracking for the femur, most likely due to late and variable adolescent growth spurts in body size. Standardizing for body size improved tracking for the male femur, but not for the humerus. Over the entire growth period, individuals averaged 5-8 out of a possible 9 changes in rank. Early childhood (