WHO Definition of work-related musculoskeletal disorders 4:
	– compression of nerves – entrapment syndromes – occurring especially in the wrist and forearm; – degenerative disorders occurring in the spine, usually in the neck or lower back, especially in those performing manual handling or heavy physical work. However, they may also occur in the hip or knee joints. • These disorders are chronic, and symptoms usually occur only after exposure to work-related risk factors for a period of time.