Purpose. Pain catastrophizing may contribute to the altered trunk muscle activity in patients with nonspecific chronic low back pain (NSCLBP). It is unclear if pain catastrophizing influences static postural control in patients with NSCLBP. This study aimed to investigate the relationship between pain catastrophizing and static postural control in NSCLBP patients. Methods. Sixty-eight participants with NSCLBP and 40 healthy participants were recruited. Postural control was assessed by the sway area and the sway length of the center of pressure (COP) during balance tests. Pain catastrophizing in participants with NSCLBP was assessed by the Pain Catastrophizing Scale (PCS). Bilateral transversus abdominis (TrA) activation was evaluated by ultrasound imaging-measured percent change in muscle thickness. Associations between COP parameter and PCS/subscales of PCS were examined by multiple linear regression (MLR). Results. Our results observed a larger COP sway area in NSCLBP group under eyes-closed condition and a lower level of voluntary activation of the bilateral TrA , compared with the healthy control group. The MLR analyses revealed that the COP area sway under eyes-closed condition was significantly associated with the PCS score/helplessness score of PCS, voluntary activation of the left TrA, and age in participants with NSCLBP (β = 0.222/0.236, 0.341/0.344, and 0.328/0.325; , 0.002, and 0.004, resp.). Conclusions. Static postural control was associated with pain catastrophizing, voluntary activation of TrA, and age in participants with NSCLBP. This indicated that pain catastrophizing may affect postural control and should be considered when interpreting balance test results and managing NSCLBP.

中文翻译：

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疼痛灾难性与非特异性慢性下腰痛患者的静态姿势控制障碍有关：一项跨部门研究

目的。疼痛灾难性变化可能会导致非特异性慢性下腰痛（NSCLBP）患者的躯干肌肉活动改变。目前尚不清楚疼痛的严重程度是否会影响NSCLBP患者的静态姿势控制。这项研究的目的是调查NSCLBP患者疼痛灾难性和静态姿势控制之间的关系。方法。招募了NSCLBP的68名参与者和40名健康参与者。在平衡测试期间，通过摇摆面积和压力中心的摇摆长度（COP）评估姿势控制。通过疼痛灾难量表（PCS）评估NSCLBP参与者的疼痛灾难性。通过超声成像测量肌肉厚度的百分比变化评估双侧腹横肌（TrA）激活。COP参数和PCS / PCS子量表之间的关联通过多元线性回归（MLR）进行了检验。结果。我们的结果观察到闭眼时NSCLBP组的COP摆动面积更大 双边TrA的自愿激活水平较低 ，与健康对照组相比。MLR分析显示，闭眼条件下的COP区域摆动与PCS的PCS评分/无助评分，左TrA的主动激活以及NSCLBP参与者的年龄显着相关（ β  = 0.222 / 0.236，0.341 / 0.344和0.328 / 0.325；， 0.002和0.004）。结论。静态姿势控制与NSCLBP参与者的疼痛严重程度，TrA的主动激活和年龄有关。这表明疼痛的灾难性发作可能会影响姿势控制，在解释平衡测试结果和管理NSCLBP时应予以考虑。