In one embodiment, an apparatus is provided that quantifies the rotation of {HEAD ~ the tibia} in response to {TAIL ~ a known torque} 
In one embodiment , an apparatus is provided that quantifies the rotation of { HEAD ~ the tibia } in response to { TAIL ~ a known torque }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL