Spanish Translation, Cross-Cultural Adaptation, and Validation of the Olerud-Molander Ankle Score (OMAS) for Ankle Fractures

• Published in: Foot & ankle orthopaedics Vol. 8; no. 4; p. 24730114231213594
• Main Authors: González-Alonso, Marcos, Trapote-Cubillas, Ana R., Madera-González, Francisco J., Fernández-Hernández, Óscar, Sánchez-Lázaro, Jaime A.
• Format: Journal Article
• Language: English
• Published: Los Angeles, CA SAGE Publications 01.10.2023; Sage Publications Ltd; SAGE Publishing
• Subjects: Adaptation; Ankle; trauma; patient-reported outcomes; score; OMAS; Spanish; Olerud-Molander; ankle fracture; outcome studies; validation
• ISSN: 2473-0114; 2473-0114
• DOI: 10.1177/24730114231213594

Background: The aim of this study was to translate and cross-culturally adapt the Olerud-Molander Ankle Score (OMAS) into Spanish and to assess its reliability and validity. Methods: The translation and adaptation to develop the Spanish version of the OMAS (OMAS-Sp) was performed according to current international guidelines. The OMAS-Sp was administered to 98 patients with a surgically treated ankle fracture, and it was repeated 7-14 days later to assess construct reliability of each question’s score and the total score. Test-retest reliability and the internal consistency were calculated, and concurrent validity was assessed by comparing the OMAS-Sp with the Foot and Ankle Outcome Score (FAOS). The presence of floor and ceiling effects was also analyzed. Results: Adequate internal consistency was found with a Cronbach α of 0.821. Excellent test-retest reliability was demonstrated with an interclass correlation coefficient for the total score of 0.970 (95% CI 0.956-0.980; P < .001). Spearman correlation coefficients (r’s) between the OMAS-Sp total score and the 5 FAOS subscales ranged from 0.944 to 0.951 (P < .001). No floor or ceiling effects were found. Conclusion: The OMAS-Sp demonstrated adequate psychometric properties and is a valid and reliable tool for assessing outcomes in Spanish-speaking patients with surgically treated ankle fractures. Level of Evidence: Level II, prospective cohort study.