The spherocentric knee is a non-hinged, intrinsically stable knee-joint
prosthesis which allows controlled triaxial rotation and was designed
specifically for use in severely deformed or grossly unstable knees.
Biomechanical evaluation of the prosthesis implanted in fresh human cadaver
limbs demonstrated highly favorable motion, stability, strength,
deflection, and energy absorption characterists for the spherocentric
prosthesis-bone assembly as compared with control cadaver knees. After an
average follow-up of 25.5 months after the first twenty-five spherocentric
arthroplasties, the clinical results were highly satisfactory and suggested
that the spherocentric knee may be relatively resistant to the problems of
wear debris, loosening, and breakage which have plagued other intrinsically
stable knee-joint prostheses.