Mayes Susan J, Baird-Colt Paula H, Cook Jill L
The Australian Ballet, Southbank, Victoria, Australia. School of Primary Health Care, Monash University, Frankston, 2 Kavanagh Street, Southbank, Victoria 3006, Australia.
The Australian Ballet, Southbank, Victoria, Australia.
J Dance Med Sci. 2015 Mar;19(1):3-10. doi: 10.12678/1089-313X.19.1.3.
Atrophy of the stabilizing muscles of the hip, such as quadratus femoris (QF), may predispose the hip joint to dysfunction. Ultrasound imaging (USI) has been shown to be a valid and reliable method of measuring the size of several hip muscles, but QF size has not been investigated. The objectives of this study were to establish the criterion validity of USI against the "gold standard" magnetic resonance imaging (MRI) for measuring the QF cross-sectional area (CSA) and to investigate intra-rater reliability of USI. Eleven current or retired professional ballet dancers (six women, five men) volunteered for USI of their QF within 1 week of MRI. The mean CSAs of QF were compared between the two imaging modalities, and the mean USI CSAs from two different trials were compared. Mean CSA with MRI (4.8 cm(2), ± 1.54) was significantly larger than mean CSA with USI (4.29 cm(2) ± 1.56; t = 5.82; p < 0.001), and the mean difference was 0.41 cm² (9%). However, the measures were highly correlated for intra-class reliability (r = 0.96, p < 0.001), and intra-class correlation coefficients (ICC) demonstrated excellent agreement (ICC = 0.90; 95% confidence interval [CI]: 0.20 -0.97) and consistency of measures (ICC = 0.96; 95% CI: 0.90- 0.98). Intra-rater reliability of measuring QF with USI was excellent between two trials (ICC = 0.98; 95% CI: 0.96- 0.99). The minimal detectable change at a 95% CI (MDC95) was 0.38 cm(2) (9.5%). It is concluded that USI is a valid and reliable measure of QF muscle size and can be used to measure QF CSA in a research or clinical setting.
髋部稳定肌（如股方肌，QF）萎缩可能使髋关节易发生功能障碍。超声成像（USI）已被证明是测量几块髋部肌肉大小的有效且可靠的方法，但尚未对股方肌大小进行研究。本研究的目的是确定USI相对于“金标准”磁共振成像（MRI）测量股方肌横截面积（CSA）的标准效度，并研究USI的评分者内信度。11名现役或退役的专业芭蕾舞演员（6名女性，5名男性）在进行MRI检查的1周内自愿接受股方肌的USI检查。比较了两种成像方式下股方肌的平均CSA，并比较了两次不同检查中USI的平均CSA。MRI测量的平均CSA（4.8 cm²，±1.54）显著大于USI测量的平均CSA（4.29 cm²±1.56；t = 5.82；p < 0.001），平均差异为0.41 cm²（9%）。然而，这些测量在组内信度方面高度相关（r = 0.96，p < 0.001），组内相关系数（ICC）显示出极好的一致性（ICC = 0.90；95%置信区间[CI]：0.20 - 0.97）以及测量的一致性（ICC = 0.96；95% CI：0.90 - 0.98）。两次检查之间，使用USI测量股方肌的评分者内信度极佳（ICC = 0.98；95% CI：0.96 - 0.99）。95% CI下的最小可检测变化（MDC95）为0.38 cm²（9.5%）。结论是，USI是测量股方肌大小的有效且可靠的方法，可用于研究或临床环境中测量股方肌CSA。
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