Editing Hammer (section)

==Ergonomics and injury risks==
[[File:Nagelkranzfraktur.jpg|thumb|Hitting one's fingertip with a hammer can cause a [[bone fracture|comminuted]] (multi-fragment) [[fracture of the finger]].]]
A hammer may cause significant injury if it strikes the body. Both manual and powered hammers can cause [[peripheral neuropathy]] or a variety of other ailments when used improperly. Awkward handles can cause [[repetitive stress injury]] (RSI) to hand and arm joints, and uncontrolled shock waves from repeated impacts can injure nerves and the skeleton. Additionally, striking metal objects with a hammer may produce small metallic projectiles which can become lodged in the eye. It is therefore recommended to wear [[safety glasses]].