{HEAD ~ A metacarpophalangeal prosthesis} includes {TAIL ~ a metacarpal component} having a head portion and a phalangeal component having a socket portion 
includes
{ HEAD ~ A metacarpophalangeal prosthesis } includes { TAIL ~ a metacarpal component } having a head portion and a phalangeal component having a socket portion
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH