Aim: This study aimed to evaluate differences in tactile acuity (TA) in people with non-specific persistent low back pain (NSPLBP) with and without predominant central sensitisation (CS).Method: An analytical cross-sectional study was conducted with 45 participants divided into three groups: (i) subjects with NSPLBP with predominant CS (n = 14), (ii) subjects with NSPLBP without predominant CS (n = 16) and (iii) subjects without low back pain (n = 15). Using an analogue calliper, TA was measured using the two-point discrimination threshold (TPD) in the three groups, both horizontally and vertically in the painful region. The analysis was based on the comparison of median discrimination thresholds between groups using the Kruskal-Wallis test.Result: A higher median TPD value was observed in the group with NSPLBP with predominant CS (vertical measurement 37.5 mm; horizontal measurement 52.5 mm) compared to the group with NSPLBP without predominant CS (vertical measurement 32.5 mm; horizontal measurement 33.8 mm) and the group without low back pain (vertical measurement 30 mm; horizontal measurement 27.5 mm) (p < 0.0001), both in vertical and horizontal measurement.Conclusion: The findings found in this study highlight the need to differentiate patients with NSPLBP with predominant CS when considering therapeutic evaluation as an indirect mechanism for assessing the perceptual function of the primary somatosensory cortex.

中文翻译：

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非特异性持续性下腰痛患者的触觉敏锐度和中枢敏化优势。

目的：本研究旨在评估具有和不具有主要中枢敏化（CS）的非特异性持续性下腰痛（NSPLBP）患者的触觉敏锐度（TA）。方法：对45名参与者进行了分析性横断面研究分为三组：（i）患有CSPLBP且CS占优势的受试者（n = 14），（ii）患有NSPLBP而不占CS优势的受试者（n = 16），以及（iii）没有下腰痛的受试者（n = 15）。使用模拟卡尺，在疼痛区域中水平和垂直方向使用三组两点鉴别阈值（TPD）测量TA。该分析基于使用Kruskal-Wallis检验对各组之间的中位鉴别阈值进行比较。