JACK M BERT, MD
Medical Practice at Woodlane Bay, Saint Paul, MN

5234433, Aug 10, 1993

Oct 18, 1991

7/779525

Jack M. Bert - Woodbury MN
Richard W. Woods - Baltimore MD

Kirschner Medical Corporation - Timonium MD

A61B 1756

606 88

A method and instruments for replacing the articulating surfaces of a knee joint in which the diseased area is restricted to one of the medial and lateral compartments. A femoral intramedullary rod is placed down the center of the femur. A femoral cutting block is affixed at one side to the rod and at the other side to an outrigger attached to the femur by smooth pins. The cutting block is adjustable rotationally and in the anterior-posterior plane. The cutting block is provided with surgical saw guide slots for the posterior and distal articular surface cuts and the chamfer cuts, all of which are made with the cutting block in place. The cutting block is removed and a drill guide is used for drilling two holes in the distal articular cut surface for receipt of the mounting pegs of the femoral unicompartmental prosthetic implant. A tibial intramedullary rod is placed down the center of the tibia, to which is adjustably affixed a vertical cutting block, a horizontal cutting guide and a caliper measuring device. The caliper measuring device is used to properly locate the cutting guide and the horizontal tibial cut is made.

2003010, May 29, 2003

Nov 27, 2002

10/305370

Richard Rosa - Short Hills NJ, US
Vernon Hartdegen - Collierville TN, US
Eric Stookey - Cordova TN, US
Jack Bert - Woodbury MN, US
Michael Gross - Halifax, CA

A61F002/38

623/020300, 623/020320, 623/020360

A knee joint prosthesis comprises a femoral component for implantation on a prepared femoral condyle of a knee and a tibial component for implantation on a prepared corresponding tibial plateau of the knee. The femoral component has a femoral articular surface cooperable with a tibial articular surface of the tibial component to permit motion at the knee. The femoral articular surface has a medial-lateral radius of curvature, and the tibial articular surface has a medial-lateral radius of curvature 0.25 to 5.00 mm longer than the medial-lateral radius of curvature of the femoral articular surface. The tibial articular surface has a medial-lateral mid-point, and the femoral articular surface defines a tracking line for the femoral component which tracks in an anterior-posterior direction along the medial-lateral mid-point as the knee moves between extension and flexion. The tracking line tracks at a medial-lateral angle relative to the medial-lateral mid-point of the tibial articular surface.

5122144, Jun 16, 1992

Sep 26, 1989

7/412318

Jack M. Bert - Woodbury MN
Richard W. Woods - Baltimore MD

Kirschner Medical Corporation - Timonium MD

A61B 1756, A61F 238

606 88

A method and instruments for replacing the articulating surfaces of a knee joint in which the diseased area is restricted to one of the medial and lateral compartments. A femoral intramedullary rod is placed down the center of the femur. A femoral cutting block is affixed at one side to the rod and at the other side to an outrigger attached to the femur by smooth pins. The cutting block is adjustable rotationally and in the anterior-posterior plane. The cutting block is provided with surgical saw guide slots for the posterior and distal articular surface cuts and the chamfer cuts, all of which are made with the cutting block in place. The cutting block is removed and a drill guide is used for drilling two holes in the distal articular cut surface for receipt of the mounting pegs of the femoral unicompartmental prosthetic implant. A tibial intramedullary rod is placed down the center of the tibia, to which is adjustably affixed a vertical cutting block, a horizontal cutting guide and a caliper measuring device. The caliper measuring device is used to properly locate the cutting guide and the horizontal tibial cut is made.