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 study <WSD>most</WSD> aspects of skeletal developmental progress during childhood . 
Meaning of the word marked with <WSD> tags:  (superlative of `many' used with count nouns and often preceded by `the') quantifier meaning the greatest in number