Passive Hip Range of Motion is Reduced in Active Subjects with Chronic Low Back Pain Compared to Controls.

Authors: Roach SM, San Juan JG, Suprak DN, Lyda M, Bies AJ, Boydston CR

Non-specific low back pain is a common condition often without a clear mechanism for its presentation. Recently more attention has been placed on the hip and its potential contributions to non-specific chronic low back pain (NSCLBP). Emphasis in research has mainly been placed on motor control, strength, and endurance factors in relation to NSCLBP. To date there has been limited focus on hip mobility and its potential contribution in subjects with NSCLBP. Therefore, the aim of this study was to compare passive ROM in hip extension, hip internal rotation, hip external rotation, and total hip rotation in active subjects with NSCLBP to healthy control subjects. The author’s hypothesis was that active subjects with NSCLBP would present with decreased total hip ROM and greater asymmetry when compared to controls.  The authors found a statistically significant difference (p<0.001) in hip passive extension ROM between the control group and the NSCLBP group bilaterally. Mean hip extension for the control group was 6.8° bilaterally. For the NSCLBP group, the mean hip extension was -4.2° bilaterally. This corresponds to a difference of means between groups of 10.8°. There were no statistically significant differences (p>0.05) in hip IR, ER, or total rotation ROM between groups. The results of this study indicate that a significant difference in passive hip extension exists in active subjects with NSCLBP compared to controls. It may be important to consider hip mobility restrictions and their potential impact on assessment of strength in NSLBP subjects.

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