I learned while caring for my mother that merely giving her "a hand" was not sufficient to give her stability while walking or when she was trying to get up from a seated position.  I learned that holding her upper arm worked much better for both tasks.  I'm still amazed when I see people supposedly helping the elderly or those who are physically injured by dragging them along by the hand.  They are generally in too much of a hurry, despite the goodness of their intentions, to notice how pulling by the hand makes the person supposedly being helped so unstable and actually in danger of falling. 

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