Sentence:  Since a Skeletal Age rating can be made at any age during growth , from Elbow , Shoulder , Knee , or <WSD>Foot</WSD> as well as Hand , 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 part of the leg of a human being below the ankle joint