Ultrasonic Measurements of the Iliotibial Tract in the Ober’s Test and Modified Ober’s Test in Asymptomatic Volunteers
Date Issued
2004
Date
2004
Author(s)
Chen, Chien-ming
DOI
zh-TW
Abstract
Background: Ober’s test and modified Ober’s test are methods which commonly used to assess the iliotibial band(ITB) tightness and also the techniques in stretching a tight ITB in the clinic. But there are not enough scientific evidences to prove whether the ITB is under stretch in these testing manuvers. And correlations between the effectiveness of stretch and angle of hip adduction have not yet been evaluated. Purposes: The aims of this study were: 1.To provide evidences on sonographic morphologic changes of the ITB under Ober’s test and modified Ober’s test. 2.To analyze correlations between morphologic changes of the ITB and hip adduction angle in Ober’s test and modified Ober’s test positions. 3.To evaluate effects of possible confounding factors in this study. Methods: The instruments included a ultrasound , a inclinometer and an electromyography. 40 volunteers (20 males, mean age 24.3±4.9 years old and 20 females, mean age 24.7±3.4 years old) anticipated in this study, and the ITB width, thickness and hip adduction angle in Ober’s and modified Ober’s test ( knee joint flexion 90° and extension) were measured. Twenty subjects were randomly selected from these 40 volunteers to measure the muscle activities of tensor fascia lata and gluteus maximus muscle in Ober’s and modified Ober’s test . Results: In Ober’s test, hip adduction angle was significantly smaller than that of modified Ober’s test (p=0.027). There were no significant differences between male and female in hip adduction angles, ITB thickness and width in each Ober’s and modified Ober’s test. The correlation between the ITB width and hip adduction angle was significant both in Ober’s test and in modified Ober’s test （r=-0.508，p<0.001 ； r=-0.377，p<0.001）, but there was not significant correlation between the ITB thickness and hip adduction angle in Ober’s and modified Ober’s test. Height, weight, and thigh length of subjects did not significantly correlate with ITB width , thickness and hip adduction angle. (p＞0.05). The muscle activities of tensor fascia lata and gluteus maximus were not affected by Ober’s and modified Ober’s tests when the subjects were relaxed（p=0.733，0.916）. Conclusion: This study provided the preliminary evidences of morphologic changes of the ITB in Ober’s test and modified Ober’s test, and had shown that ITB width, thickness and hip adduction angle did not correlate significantly with demographic features. ITB is stretched in Ober’s test and modified Ober’s test, but the efficacy may be higher in modified Ober’s test when comparing to Ober’s test.
Subjects
腸脛束
歐柏測試
超音波測量。
Iliotibial band
ultrasound measurement.
Type
other
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