SATURDAY, Sep. 21 (HealthScoutNews) -- Only three types of injuries account for the majority of the 6 million workplace injuries that occur in the United States each year, according to a new survey.

The American Academy of Orthopaedic Surgeons (AAOS) reports that over-exertion, repetitive stress injuries and falls while on the job cost more than $60 billion in lost wages, health care expenses, legal costs and worker's compensation claims.

And what, by far, is the most common workplace injury?

Back sprains -- because of falls, slips and improper lifting -- add up to more than half of the 6 million injuries each year. Slippery and uneven floors are one of the main causes of workplace falls that can cause permanent disability, or even death. These falls can be prevented with proper training and safe work practices, the AAOS says.

Carpal Tunnel Syndrome (CTS) is one of the most common causes of hand and wrist pain. It can affect computer users, cashiers, assembly-line workers, meatpackers, musicians, writers (especially those using the computer), surgeons and other people who use their hands in repetitive motions that strain wrist tendons.

If you suspect CTS, you should pay prompt attention to the first signs of pain or discomfort, the AAOS says.

More information

For insight into workplace safety, go to the American Academy of Orthopaedic Surgeons.