{HEAD ~ The other end} of the prosthesis is shaped to replace {TAIL ~ the other end} of the surgically removed bone segment 
is shaped to replace
{ HEAD ~ The other end } of the prosthesis is shaped to replace { TAIL ~ the other end } of the surgically removed bone segment
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH