Physical function impairment in patients with low back pain (LBP) occurs due to the influence of psychosocial factors. Only a few studies have objectively evaluated physical function. We aimed to objectively assess the physical functions of individuals subjects with LBP, and clarify the association between physical function and psychosocial factors. We enrolled 411 individuals with LBP working in special needs schools. We examined their degree of pain, and the psychosocial factors strength through the STarT Back Tool, which categorized them into the low-risk, medium-risk, and high-risk groups. We assessed their abdominal muscle endurance, lower limb muscle strength, and hip joint flexibility. The relationships between these physical functions and psychosocial factors were analyzed by logistic regression models. Those in the high-risk group had significantly lower abdominal muscle and lower limb muscle strength (p<0.001). After adjusting for confounding factors, the odds ratios of the high-risk compared to the low-risk group for low abdominal muscle endurance, lower limb muscle strength, and restricted right and left Straight Leg Raising were 5.47, 3.14, 2.65, and 3.12, respectively (95% CIs: 2.35–12.74, 1.43–6.89, 1.08–6.55, and 1.20–8.11, respectively). Therefore, the low physical function observed in the high-risk group was associated with their psychosocial factors.

腰痛（LBP）患者的身体功能障碍是由于心理社会因素的影响而发生的。只有少数研究客观地评估了身体机能。我们旨在客观地评估 LBP 个体受试者的身体功能，并阐明身体功能与社会心理因素之间的关联。我们招收了 411 名在特殊需要学校工作的 LBP 个人。我们通过 START Back Tool 检查了他们的疼痛程度和心理社会因素强度，该工具将他们分为低风险、中风险和高风险组。我们评估了他们的腹肌耐力、下肢肌肉力量和髋关节灵活性。通过逻辑回归模型分析这些身体功能和社会心理因素之间的关系。p <0.001）。调整混杂因素后，高危组与低危组在腹肌耐力低、下肢肌力、左右直腿抬高受限的比值比分别为5.47、3.14、2.65和3.12， （95% CI：分别为 2.35–12.74、1.43–6.89、1.08–6.55 和 1.20–8.11）。因此，在高危组中观察到的低身体机能与其心理社会因素有关。