Navigation
Benefits for the user
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The navigation technology helps the surgeon to determine intraoperatively, reproducibly and with high precision the ideal position of an implant with reference to the mechanical leg axis and taking into account the soft tissue situation. This can affect the long-term behaviour of the implant system positively.
High-capacity computers calculate and visualise in real time the optimal spatial position of the bone resections and, as a result, the optimal final position of the implant.
Our strategy
In developing and upgrading navigation technologies for MATHYS implant systems, it is our strategy to cooperate with partners who own the appropriate core competence and have many years of experience in this field.
In PRAXIM Medivision in Grenoble (F) we have found a competent partner who has worked for over 15 years in navigation, has numerous patents (e.g. bone morphing®algorithm) and publications about its products, and who can offer an open navigation platform to the user (for further information, please refer to www.praxim.fr).
Our products
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 Abb. 1: Patented bone morphing® algorithm: scanning of the proximal tibia in order to generate an exact virtual reality bone model. | |
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 Fig. 2: Determination of the centre of the hip (= one point of the mechanical axis) by moving the thigh in a circle. | |
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 Fig. 3: Planning of the optimal (internal) rotation of the femur while applying a quantifiable ligament tension using a double spring tensor. | |
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 Fig. 4: Planning of the optimal position of the femoral component by controlling the expected ligament tension and the medial and lateral femoral resection heights. |
balanSys®; kneelogics navigation system
The easy and intuitively usable balanSys®; kneelogics navigation system was developed in cooperation with PRAXIM Medivision.
The system uses a non-image-based technology that does not require any preoperative preparation. The information about the position of the bones is gained intraoperatively by a patented bone morphing® algorithm. The navigation system generates a precise bone model in a virtual reality environment after scanning the real bone surface (Fig. 1), determining the centre of the hip (Fig. 2) and the mechanical leg axis.
Based on this model, bone resections and hence die final position of the implant components can be determined and visualised taking into account the morphometric and soft tissue situation (example: control of the internal rotation of the femur / external rotation of the femoral component in Fig. 3).
The system permits the operator to adapt the optimal positions of bone resection planes proposed by the computer in the planning phase to his preferences and specifically to the intraoperative situation, any time and very comfortable. Moreover, the monitor displays the expected knee ligament tension in the planning phase already (Fig. 4).
After the insertion of the implant components, a knee kinematics module records the most important measured variables, such as the ROM (range of motion), the anteroposterior as well as the varus-valgus stability of the knee in any knee flexion position.
For documentation purposes, the navigation system memorizes all relevant intraoperative data (such as implant sizes, bone resection heights, or the position of the implants), and allows storing them for further use on a CD-ROM at the end of the intervention.
Other innovative products
Our company has several other innovated products which are not
published on this website. Please refer to your Mathys contact person
for further information.