Sentence:  Since a Skeletal Age rating can be made at any age during growth , from Elbow , Shoulder , Knee , or Foot as well as Hand , it seems to be the method of choice when one wishes to <WSD>study</WSD> most aspects of skeletal developmental progress during childhood . 
Meaning of the word marked with <WSD> tags:  consider in detail and subject to an analysis in order to discover essential features or meaning