The apparatus is configured to minimize {HEAD ~ the influence} of {TAIL ~ other joints} on the rotation analysis 
of
The apparatus is configured to minimize { HEAD ~ the influence } of { TAIL ~ other joints } on the rotation analysis
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH