Assessment of the Brazilian Portuguese Version Selective Control Assessment of the Lower Extremity (SCALE) After Translation and Cross-Cultural Adaptation

Background/Objectives: This study aims to translate and validate the Selective Control Assessment of the Lower Extremity (SCALE) tool from English into Portuguese. Methods: SCALE was translated into Portuguese independently by two native Portuguese translators and synthesized into a single manuscript: SCALE-BR. Using this test in patients with spastic cerebral palsy, the internal consistency (Cronbach’s α), reliability by intra-class correlation (ICC), and validity compared with the Gross Motor Function Classification System (GMFCS) scores were evaluated. Results: 30 patients diagnosed with spastic cerebral palsy were assessed, with a predominance of males (66.7%), a mean age of 12.9 ± 7.9 (4–38 years) and a majority of diparetic patients (73.3%) and GMFCS I (53.3%). Spearman’s correlation coefficient, R2 = −0.84, p < 0.001, revealed an inverse relationship between the SCALE instrument and the GMFCS, corroborating the findings in the literature. There was an excellent intra- and interobserver agreement (ICC > 0.75). Conclusions: The Portuguese version of the questionnaire was effective, proving to be reproducible and reliable among different evaluators and patients, with an inverse correlation with the GMFCS as expected in the literature.