A framework for the classification and diagnosis of work-related upper extremity conditions: systematic review.

Objective: A frequently cited problem in epidemiological research is the inadequate operational definition of umbrella terms such as Musculoskeletal Disorders (MSD). Specific conditions attached to these labels and their corresponding signs and symptoms are also poorly defined. The purpose of this study was to identify internationally applied terminology and definitions appropriate to work-related upper extremity (UE) conditions.