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The correct way of using crutch has to change the length frequently,because there are different requirement in different situations.For example, you should shorten the crutch when going up the stairs; on the contrary, lengthen the crutch when you go down the stairs.Few people can use it in the right way nowadays, because it is inconvenient to adjust the length of crutch.
This crutch is combined with the stick of atmospheric pressure,
and that makes it to adjust the length easily.It can upgrade the efficacy and the security.
Lin,Kuan-You Luo,Song-Yang Chan,Bing-Han Wang,Zhi-Hong
New Taipe, Taiwan