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Background: The Disability of the Arm, Shoulder and Hand (DASH) questionnaire assesses the impact of upper extremity disorders on quality of life. However, its use in the Mexican population has not been formally validated., Objective: To conduct a cultural adaptation and validation of the DASH questionnaire to evaluate the perspective of patients with neurogenic disorders of the upper extremity regarding the impact on their quality of life., Method: We performed an adaptation of the Spanish version of the DASH questionnaire to the Mexican vocabulary and applied it to 478 volunteers. Ceiling effect, floor effect, item-total correlation, descriptive statistics of items and total score, internal consistency, precision, cross-sectional and longitudinal validity were estimated by comparing healthy controls and affected individuals with different disability levels., Results: Our DASH questionnaire version was equivalent to those previously approved and showed homogeneity of the items with respect to the total value of the questionnaire (Cronbach's alpha > 0.96). In addition, it showed an accuracy of 7.25 points and the crosssectional and longitudinal validity was documented with significant differences between groups and subgroups with distinct disability levels., Conclusions: The DASH questionnaire can be used with a high level of confidence in the Mexican population.

Objective: To describe the musculoskeletal disorders and association with physical and environmental in students of Dentistry., Methods: Cross sectional study. Simple random sampling was conducted obtaining a proportional sample of 182 students per semester. Collecting information from physical and environmental exposures related to different clinical practice and this was assessed by a structured survey questionnaire type. The valuation muscle was performed by visual analysis with Scan-test. To assess factors related to working position, the instrument was used RULA. For the analysis of the association were used odds ratios with confidence intervals of 95%. For the multivariate analysis using logistic regression., Results: 58.2% of students had pain tenderness in upper trapezius and 45.6% in area cervical. Lateral movements in the cervical found pain in 35.7%, with the bending cervical 35.1% related to all these factors own dental practice and not to other factors external., Conclusions: The onset of muscle pain in this population is influenced by multiple variables, most of them, related to dental practice of students to interact with each other can trigger symptoms at neck and back.