Bloom Nancy, Cornbleet Suzanne L
Program in Physical Therapy, Washington University School of Medicine, St Louis, MO∗.
Program in Physical Therapy, Washington University School of Medicine, St Louis, MO†
PM R. 2014 Dec;6(12):1137-42. doi: 10.1016/j.pmrj.2014.06.002. Epub 2014 Jun 17.
To investigate the effect of hip joint position on hip rotator muscle strength of healthy young adults by using a hand-held dynamometer.
A cross-sectional cohort study.
A university medical center.
Thirty-four healthy (19 women, 15 men; mean [standard deviation] age, 25 ± 2.3 years) participated in this study.
A hand-held dynamometer was used to measure the strength of hip internal rotators and external rotators in 2 positions: hip flexion in sitting and hip extension in supine. The hip was tested in a neutral position with respect to rotation, abduction, and adduction. Isometric force in pounds was measured as the subject pushed against the device.
For each subject, hip rotator muscle strength measurements were taken during a single session. Hypotheses were developed before data collection.
Hip internal rotators were significantly stronger in hip flexion compared with hip extension (P < .01). There was no significant difference found in the hip external rotators between the 2 positions.
Hip internal rotators and external rotators behave differently when comparing strength measurements between the positions of hip flexion and hip extension. A hand-held dynamometer provided an objective measurement of strength that was clinically feasible to use. Both muscle length and moment arms influence force production of the hip rotators as the hip position changes. Understanding these relationships may help clinicians interpret strength findings and direct intervention toward strengthening the appropriate muscles by using the most advantageous position.
使用手持测力计研究髋关节位置对健康年轻成年人髋部旋转肌力量的影响。
横断面队列研究。
大学医学中心。
34名健康人（19名女性，15名男性；平均[标准差]年龄，25±2.3岁）参与了本研究。
使用手持测力计在两个位置测量髋部内旋肌和外旋肌的力量：坐位时髋关节屈曲和仰卧位时髋关节伸展。髋关节在旋转、外展和内收方面处于中立位进行测试。当受试者推抵该装置时，以磅为单位测量等长力量。
对每个受试者在单个疗程期间进行髋部旋转肌力量测量。在数据收集之前提出假设。
与髋关节伸展相比，髋关节屈曲时髋部内旋肌明显更强壮（P <.01）。两个位置之间的髋部外旋肌未发现显著差异。
在比较髋关节屈曲和伸展位置之间的力量测量时，髋部内旋肌和外旋肌表现不同。手持测力计提供了一种客观的力量测量方法，在临床上使用是可行的。随着髋关节位置的变化，肌肉长度和力臂都会影响髋部旋转肌的力量产生。了解这些关系可能有助于临床医生解释力量检测结果，并通过使用最有利的位置指导干预措施来增强适当的肌肉。
