Sentence:  Since a Skeletal Age rating can be made at any age during growth , from Elbow , Shoulder , Knee , or Foot as well as <WSD>Hand</WSD> , it seems to be the method of choice when one wishes to study most aspects of skeletal developmental progress during childhood . 
Meaning of the word marked with <WSD> tags:  the (prehensile) extremity of the superior limb