Surgical planning and method

Abstract

Methods and apparatus for planning and / or carrying out a total knee replacement surgical procedure on a knee of a leg of a patient are described. Anatomical data for the leg of the patient is obtained, which allows the femoral mechanical axis, the tibial mechanical axis and the joint line of the knee to be determined. A planned proximal tibial cut angle and a planned distal femoral cut angle are determined. The planned proximal tibial cut angle and the planned distal femoral cut angle ensures that a long leg angle between the tibial mechanical axis and the femoral mechanical axis resulting from the planned proximal tibial cut angle and the planned distal femoral cut angle is within a first pre-selected range of values and the planned proximal tibial cut angle is within a second pre-selected range of values. A total knee replacement procedure is carried out on the knee of the patient, wherein a distal femoral cut is made using the planned distal femoral cut angle and a proximal tibial cut is made using the planned proximal tibial cut angle.

Description

Background technique [0001] The present invention relates to total knee replacement surgery, in particular to a method of planning a total knee replacement surgery, and to a workflow for performing the surgically planned surgery. [0002] The various surgical techniques for total knee replacement are generally well known and widely used. They generally involve replacing the distal portion of the patient's femur with a femoral prosthetic implant or component, and replacing the proximal portion of the patient's tibia with a tibial prosthetic implant or component. One aspect of the surgical procedure is preparing the distal portion of the femur and the proximal portion of the tibia to provide resected bone surfaces on which to place the corresponding implants. The height and angle of the resected bone surface determine the position of each implant relative to its corresponding bone, which is an element of the postoperative behavior of the patient's knee. The surgeon can also pe...

AI Technical Summary

Problems solved by technology

So while this can lead to good mechanical properties of the prosthetic components of the artificial knee joint, it can also affect the overall performance of the patient's lower extremity, as their post-op leg will be slightly straighter than pre-op

[0005] On the other hand, if an anatomically based philosophy is used for the surgery such that the femoral and tibial implants are placed such that the postoperative alignment of the leg is similar to the preoperative alignment of the leg, neither varus nor Valgus patients, which cause the load line to pass medial or lateral to the center of the knee, thus unbalancing the forces applied between the tibial and femoral prosthetic components and at the interface between the prosthetic components and their corresponding bones

Thus, while this solution preserves the alignment of the patient's leg, it can degrade the mechanical properties of the prosthetic components and also lead to further knee problems

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