Abstract: An endoprosthetic knee joint device is suited to a unicondylar procedure in which only one compartment of the knee is treated, or a duocondylar procedure, the latter employing a pair of like femoral components and a tibial component having a common platform defining separate recesses for similar pads. In addition the device maximizes the use of advantageous material properties, allows pad replacement in the event of wear, and allows pad thickness selection to correct for varus and valgus deformities.

Abstract: An endoprosthetic femoral head device comprising a ball-shaped head connected, by way of a necked portion, to the wider end of a tapered intramedullary stem is modified to facilitate implantation involving detachment and re-attachment of the greater trochanter. The modification comprises the provision of a slot which extends longitudinally along the wider end of the stem, is open at one end, and has an interior width greater than that of its longitudinal mouth. A bolt-like member is adjustably located by its head in this slot with its shaft projecting from the device for passage through a bore formed in the detached trochanter. The trochanter is thus relocated and is secured by a fastener on the shaft free end. Preferably a spider-form washer with spring legs is located between the trochanter and fastener, and a screw-in plug is applied to the slot to positively locate the bolt head.

Abstract: An endoprosthetic bone joint device developed for the elbow, but applicable elsewhere, has two hinge components respectively defining complementary first and second bearing surfaces for mutual articulatory engagement, and each apertured to define third bearing surfaces. When implanted the hinge components are first coupled by a further component passed through the apertures and defining fourth bearing surfaces to articulate with the third surfaces. At this stage all of the bearing surfaces are appropriately engaged and stabilization of the implantation securement is facilitated. Subsequently the coupling can be removed to reduce the effect of distraction stresses on the device. The first and second surfaces are suitably of spherical ball and socket form, and can be of a twinned form, while the third and fourth surfaces are suitably of circular cylindrical form extending diametrally through the ball and socket.