• Chuanxin Zhang, Yaqun Liu, Shuai Yuan, Tianbo Yang, Yuan Gao, Chao Zhu, and Zheru Ding.
• Department of Joint Surgery and Sports Medicine, Changzheng Hospital, Second Military Medical University, Shanghai 200003, China.
• Biomed Res Int. 2020 Jan 1; 2020: 1421429.

PurposeThe purpose of this study was to cross-culturally adapt and validate the Simplified Chinese version of the Lower Extremity Functional Scale (SC-LEFS).MethodsThe original English version of the Lower Extremity Functional Scale was translated and cross-culturally adapted into Simplified Chinese according to international guidelines. The SC-LEFS and 36-Item Short-Form Health Survey were administered to 213 patients with lower extremity musculoskeletal disorders. Psychometric properties including internal consistency, test-retest reliability, content validity, and construct validity were tested.ResultsThere were no floor or ceiling effects for the SC-LEFS. The scale had high values for internal consistency (Cronbach α = 0.97) and test-retest reliability (intraclass correlation coefficient = 0.97). Corrected item-total correlations for every item ranged from 0.67 to 0.89. And the item-level content validity index (I-CVI) for each item ranged from 0.78 to 1.00. Principal component analysis revealed a one-factor structure. Nine of ten prior hypotheses were confirmed, which further supports good construct validity within the SC-LEFS.ConclusionThe SC-LEFS has high internal consistency, good test-retest reliability and content validity, convergent construct validity, and a one-factor structure. Thus, it could be regarded as a reliable and valid tool to assess activity limitations in Chinese patients with lower extremity musculoskeletal disorders.Copyright © 2020 Chuanxin Zhang et al.

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