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特許 係属中 Musculoskeletal disorders (MSDs) are injuries or pain in the body's joints, ligaments, muscles, nerves, tendons, and structures that support limbs, neck and back.[1] MSDs are degenerative diseases and inflammatory conditions that cause pain and impair normal activities.[2] They can affect many different parts of the body including upper and lower back, neck, shoulders and extremities (arms, legs, feet, and hands).