Abstract: Background　Muscle groups surrounding the hip joint are core muscles often being neglected，but they have an important impact on the stability and overall function of the lumbar spine.Objective　To explore the characteristics of the strength of muscles surrounding the hip joint in patients with chronic low back pain（CLBP），providing evidence for the rehabilitation treatment of CLBP.Methods　Participants were recruited from communities surrounding Jule Road，Wuhou District，Chengdu，and Sport Hospital Attached to CDSU during March to December 2014，including 64 with CLBP（CLBP group），and 29 without（control group）．Isokinetic muscle testing was performed by use of Contrex System-Top 1000 to measure the isokinetic strength of muscles surrounding the hip joint at various angles.Visual Analogue Scale（VAS） was used to evaluate the pain degree in CLBP group.Isokinetic strength of muscles surrounding the hip joint was compared between CLBP group and control group，as well as between the CLBP patients with different degrees of pain.Results　CLBP group showed less abduction peak torque/body weight（ABPT/BW） ratio and flexion to extension peak torque（FPT/EPT） ratios for isokinetic strength of muscles surrounding both the left and right hip joints than the control group（P<0.05）．44（68.8%）and 20（31.2%）cases in the CLBP group were evaluated with mild and moderate pain，respectively.Mild pain subgroup had greater flexion peak torque/body weight（FPT/BW） ratio and extension peak torque/body weight（EPT/BW） ratio for isokinetic strength of muscles surrounding the left hip joint and greater ABPT/BW ratio for that of the muscles surrounding the right hip joint compared with moderate pain subgroup（P<0.05）．Conclusion　Decreased abductor strength of hip joint muscles is a manifestation of CLBP patients.It can impair the hip flexion，extension and abduction strength，and the impairment increases with the severity.It is suggested that attention should be paid to the hip flexion，extension and abduction strength in those with severe pain.In addition，hip abduction strength can be used as a reference indicator for clinical diagnosis and rehabilitation efficacy of CLBP.

Key words: Low back pain, Chronic low back pain, Hip joint, Isokinetic muscle strength, Pain measurement

摘要： 背景　髋关节周围肌群作为常常被忽略的核心肌群，对于腰椎稳定性和整体功能有着重要的影响。目的　探讨慢性腰痛（CLBP）患者髋关节周围肌群肌力的特征，以期为CLBP的康复治疗提供参考依据。方法　于2014年3—12月在成都市武侯区菊乐路周边社区和成都体育学院附属医院招募CLBP患者64例（CLBP组）、无腰痛者29例（对照组）。采用等速肌力测试系统（Contrex System-Top 1000）测定两组髋关节各方向的等速肌力，采用视觉模拟疼痛量表（VAS）评价CLBP组的疼痛程度。比较CLBP组和对照组，以及CLBP组不同疼痛程度患者的髋关节周围肌群的等速肌力。结果　CLBP组左侧相对髋外展力矩（ABPT/BW）、髋屈伸力矩比（FPT/EPT）和右侧FPT/EPT低于对照组（P<0.05）。根据VAS评分，CLBP组被评价为轻度和中度疼痛者分别为44例（68.8%）、20例（31.2%）。轻度疼痛患者的左侧相对屈髋力矩（FPT/BW）、相对伸髋力矩（EPT/BW）和右侧ABPT/BW高于中度疼痛患者（P<0.05）。结论　髋关节肌群外展肌力下降是CLBP患者的一个特征；症状的严重程度会影响CLBP患者髋关节屈伸和外展的肌肉力量，且症状较重者肌力下降明显。建议关注中重度疼痛患者的髋关节屈伸和外展方向的肌力情况；髋关节外展肌力可作为CLBP临床诊断和康复疗效评估的参考指标。

关键词: 腰痛, 慢性腰痛, 髋关节, 等速肌力, 疼痛测定