Background: After lower limb amputations, a decrease in gait capacity, even with prostheses, is common and persistent. Functional ability involves multiple constructs; therefore, several outcome measures, such as performance tests or self-report questionnaires, should be used to evaluate people with amputation who use prostheses. Objective: To analyze the convergent construct validity of the Brazilian version of the Houghton scale in a sample of lower limb prosthesis users. Methods: Volunteers selected were older than 18 years with any level of lower limb amputation and prosthesis use for at least 6 months. In this study, evidence of construct validity of the Houghton scale was established by the Spearman rho correlation with the Brazilian translation of the Prosthetic Limb Users Survey of Mobility and with the Physical Function (PF) and Emotional Well-being subdomains of the Medical Outcomes Study 36-Short Form Health Survey. Results: Seventy-one volunteers were recruited for the study. The sample consisted mainly of men (70.4%) with a mean age of 50 ± 12 years. The primary cause of amputation was traumatic (53.5%), and most participants (54.9%) had a transtibial amputation. The Houghton questionnaire correlated strongly with the Brazilian translation of the Prosthetic Limb Users Survey of Mobility questionnaire (rho: 0.74, p < 0.01) and weakly with the PF and Emotional Well-being of the 36-Short Form Health Survey (rho: 0.06 and rho: 0.22, respectively, p > 0.05). Conclusion: This study showed evidence of convergent construct validity of the Houghton questionnaire to measure and classify functional use of lower limb prostheses, with great value to clinical practice. Additional work is needed to assess other measurement properties in different samples.

中文翻译：

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巴西版霍顿量表的收敛结构效度

背景：下肢截肢后，即使使用假肢，步态能力的下降也是常见且持续的。功能能力涉及多种结构；因此，应使用多种结果指标（例如表现测试或自我报告问卷）来评估使用假肢的截肢患者。目的：分析巴西版霍顿量表在下肢假肢使用者样本中的收敛结构效度。方法：选择的志愿者年龄超过 18 岁，接受过任何级别的下肢截肢和假肢使用至少 6 个月。在本研究中，霍顿量表的结构有效性证据是通过 Spearman rho 与假肢用户活动性调查的巴西翻译以及医疗结果研究的身体功能 (PF) 和情绪健康子领域的相关性建立的36-简短的健康调查。结果：本研究招募了 71 名志愿者。样本主要由男性 (70.4%) 组成，平均年龄为 50 ± 12 岁。截肢的主要原因是外伤（53.5%），大多数参与者（54.9%）进行了胫骨截肢。霍顿调查问卷与假肢用户活动调查问卷的巴西译文密切相关（rho：0.74，p< 0.01），并且与 36 项简短健康调查的 PF 和情绪健康相比较弱（分别为 rho：0.06 和 rho：0.22）p> 0.05）。结论：本研究证明了霍顿问卷在测量和分类下肢假肢功能使用方面的收敛结构效度，对临床实践具有重要价值。需要进行额外的工作来评估不同样品中的其他测量特性。