Feldmuhle Aktiengesellschaft

Peter Prussner

Erhard Dorre

Ludwig Zichner

Horst Von Borries

A knee joint prosthesis includes a C-shaped femur cap to be fitted onto a resected femur condyle. The C-shaped femur cap is made up of two arch-shaped parts spaced apart and connected by a relatively flat third part. Each of the arch-shaped parts has a different radius. The arch-shaped part with the larger radius has an oblong hole extending in the circumferential direction of the part. A shaft can be placed through the oblong hole from the femur into the tibia. In addition, a tibia cap can be fitted onto the plateau of the tibia.

Knee joint prosthesis

An implantable elbow joint for connecting the upper arm and the forearm includes an axially extending sleeve of C-shape transverse cross-section, a cylindrical member engageable within the sleeve, and a connecting member implantable in the ulna and engageable with the cylindrical member in the sleeve. The sleeve embraces the trochlea of the humerus through an angle of more than 180.degree. about the sleeve axis and also serves as the abutment for supporting the radius. The sleeve has a slot extending in the radial and the circumferential directions. At least in the region of the slot, the internal surface of the sleeve is formed by a cylindrically shaped surface. A cylindrically shaped sliding member is supported in the sleeve in the region of the slot. An elongated shaft is arranged to be inserted into the ulna with one end projecting out of the ulna and extending through the slot into the sliding member.

Implantable elbow joint

A femur head cap for endoprosthesis possessing a spherical shape and having a recess for partially receiving the femur head, the recess being open toward the neck of the femur. The cap is advantageous in that it can be firmly anchored to avoid rotation and tilting without the use of bone cement and further allows for simple resection to be performed so that supply of blood to the bone is not impaired.

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Dietzenbach, Germany

Peter Prussner