Use 'sternum' when specifically referring to chest bone anatomy or medical contexts. During CPR training, we learned the correct hand placement is just above the sternum.
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Injury Descriptions
'Sternum' is used to describe injuries related to the chest bone in accidents or sports. The football player suffered a sternum injury during the game.
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Medical Terminology
When reading or writing medical reports, 'sternum' denotes the exact bone being discussed. The surgeon's report mentioned a small incision just below the sternum.