Martinez Ysidore M: Knee implant device. Brown and Martin, November 19, 1974: US3848276 (18 worldwide citation)

A joint prosthesis particularly useful in total knee replacement, and capable of providing controlled motion about three axes corresponding to the capabilities of a normal knee. A dual centered pivot with contacting arcuate support blocks provides for a combination of rotational and translational mo ...

Martinez Ysidore M: Knee implant prosthesis. Brown & Martin, October 7, 1975: US3909854 (15 worldwide citation)

A knee prosthesis for replacing the functions of the natural knee including the ability of the natural knee to rotate, abduct-adduct and flex. The device incorporates spaced pivot bearings mounted in a pivot body. The pivoting structure is connected to the natural bone structure by a connector screw ...