The risk in reaching and possibly damaging the vital areas in {HEAD ~ the posterior section} of {TAIL ~ the knee} is greatly reduced 
of
The risk in reaching and possibly damaging the vital areas in { HEAD ~ the posterior section } of { TAIL ~ the knee } is greatly reduced
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH