Differences in the lfexion-relaxation ratio of the erector spinae in the patients with different subtypes of low back pain
HU Yuan
TANG Jin-shu
QIN Jiang
SHI Xiu-xiu
ZHU Jia-liang
HOU Shu-xun
Abstract：Objective To explore the differences in the lfexion-relaxation ( FR ) ratio of the erector spinae in a group of healthy persons and 2 different subgroups with chronic low back pain ( LBP ).Methods Among 97 chronic non-speciifc LBP patients, 51 patients with lfexion pain but no extension pain were taken as lfexion pain group and 46 patients with extension pain but no lfexion pain as extension pain group. There were 35 healthy subjects in the control group. The electromyographic signals of the erector spinae during the trunk lfexion and return tasks were recorded using surface electromyography ( EMG ) in all 3 groups, and the FR ratios of the erector spinae were measured. Results The FR ratios were 4.97±1.03, 21.8±4.75 and 22.85±3.64 in lfexion pain group, extension pain group and control group. The FR ratio in lfexion pain group was obviously lower than that in extension pain group (P<0.01 ) and control group (P<0.01 ). No statistically signiifcant differences existed in the FR ratio between extension pain group and control group ( P=0.27 ).Conclusions The FR ratio in lfexion pain group is signiifcantly lower than that in control group. The differences in the FR ratio can be used to distinguish a subtype of patients with lfexion pain from pain-free control subjects. However, extension pain patients are not indistinguishable from pain-free control subjects based on the FR ratio.
Keywords：Low back painPsoas musclesElectromyographyDiagnostic techniques and procedures
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：3( 288-290 )