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Back Pain

Back Injuries; Pain, Back 



Article: Back injury

Preventing back injury is a major workplace safety challenge. According to the American Bureau of Labor Statistics, more than one million workers suffer back injuries each year, and back injuries account for one of every five workplace injuries or illnesses. Further, one-fourth of all compensation indemnity claims involve back injuries, costing industry billions of dollars on top of the pain and suffering borne by employees.

Discussion

The human spine and associatedmuscles and other soft tissues are vulnerable to some types of injury. The low back in particluar is prone to injury, as it is both highly flexible, allowing us to bend and twist in all directions, and subject to a great deal of stress as the main load-bearer of the torso. Though lifting, placing, carrying, holding and lowering are involved in manual materials handling (the principal cause of compensable work injuries) the BLS survey shows that four out of five of these injuries were to the lower back, and that three out of four occurred while the employee was lifting. No approach has been found for totally eliminating back injuries caused by lifting, though a substantial portion can be prevented by an effective control program and ergonomic design of work tasks.

While many instances of back pain can be traced to a specific injury (e.g. a muscle strain, often the acute onset of back pain is actually a result of a long term process of general degeneration, such as degenerative disc disease or a lumbar disc herniation.

OSHA

This agency is looking at both major categories of methods for preventing lifting injuries--administrative controls and engineering controls. The former includes carefully selecting and/or training workers so they can safely perform lifting tasks. Engineering controls attempt to redesign a job so lifting becomes less hazardous. OSHA is considering ways to help employers and employees reduce these injuries. The agency requested public comments October 2, 1986 to help it develop either guidelines or regulations for manual lifting.


Suggested administrative precautions

  • Strength testing of existing workers, which one study showed can prevent up to one-third of work-related injuries by discouraging the assignment of workers to jobs that exceed their strength capabilities.
  • Training employees to utilize lifting techniques that place minimum stress on the lower back.
  • Physical conditioning or stretching programs to reduce the risk of muscle strain.

Suggested engineering controls

  • A reduction in the size or weight of the object lifted. The parameters include maximum allowable weights for a given set of task requirements; the compactness of a package; the presence of handles, and the stability of the package being handled.
  • Adjusting the height of a pallet or shelf. Lifting which occurs below knee height or above shoulder height is more strenuous than lifting between these limits. Obstructions which prevent an employee's body contact with the object being lifted also generally increase the risk of injury.
  • Installation of mechanical aids such as pneumatic lifts, conveyors, and/or automated materials handling equipment.

In a recent study it was determined that up to one-third of compensable back injuries could be prevented through better job design (ergonomics).

Other factors include frequency of lifting, duration of lifting activities and type of lifting, as well as individual variables such as age, sex, body size, state of health, and general physical fitness level.

The approaches suggested include the NIOSH Work Practices Guide for Manual Lifting* employing an equation using horizontal location, vertical location, vertical travel distance and lifting frequency. Another approach puts a maximum weight limit for any single lift, or a load-moment limit which would consider the effect of the distance of the load from the worker's body. Tables of maximum weights for different percentiles of male and female workers have also been proposed.

The NIOSH (National Institute for Occupational Safety and Health) Work Practices Guide for Manual Lifting (NTIS PB 821-789-48) (Cost $17.50) is available from:

 The National Technical Information Service 5285 Port Royal Road Springfield, VA 22161 

This is one of a series of fact sheets highlighting U.S. Department of Labor programs. It is intended as a general description only and does not carry the force of legal opinion.

See also

  • Ergonomics
  • Occupational safety and health
  • Lumbar
  • Back pain

Resources



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October 25, 2014



Page Updated: July 22, 2006
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