For example, in one particular embodiment, the essentially inflexible contact surface of {HEAD ~ the sensor} can include curvature such as that described by the contact surface of a polymeric bearing portion of {TAIL ~ an implantable artificial replacement joint} such as the polymeric bearing portion of a hip, knee, or shoulder replacement joint 
For example , in one particular embodiment , the essentially inflexible contact surface of { HEAD ~ the sensor } can include curvature such as that described by the contact surface of a polymeric bearing portion of { TAIL ~ an implantable artificial replacement joint } such as the polymeric bearing portion of a hip , knee , or shoulder replacement joint
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