The weight and bulkiness of objects lifted are major contributing factors to injuries. Workers also frequently cite body movement as contributing to their injuries. Bending, twisting, and turning are the more commonly cited movements that cause back injuries.
The U.S. Bureau of Labor Statistics reported that sprains and strains accounted for 42% of injuries and illnesses resulting in days away from work in 2004. That year there were 282,240 cases of back injuries that accounted for 22% nonfatal occupational injuries involving days away from work. Hands, arms, and feet are also vulnerable to injury during manual handling of materials.
Also in 2004, there were 316,670 overexertion cases with lost workdays (25% of all lost-workday cases). Most of those cases were due to lifting (173,400). Pushing/pulling and carrying also result in large numbers of overexertion injuries.
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