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[Minimally invasive unicondylar knee replacement with computer navigation]
R G Haaker1, M Wojciechowski, P Patzer
1Klinik für Orthopädie, Rheumatologie, Traumatologie St.-Vincenz-Hospital, Danziger Strasssse 17, 33034 Brakel, Deutschland. rolf.haaker@gmx.de
Der Orthopade
|September 14, 2006
Summary
Navigation systems improve accuracy in knee replacement surgery, ensuring the correct tibial slope and avoiding leg axis overcorrection. This leads to more reproducible results for patients undergoing medial knee monosled procedures.
Area of Science:
- Orthopedic Surgery
- Medical Device Technology
Background:
- Minimally invasive knee replacement surgery aims for precise component alignment.
- Achieving optimal tibial slope is crucial for knee monosled prosthesis function.
Purpose of the Study:
- To evaluate the accuracy of tibial component placement using a navigation system in minimally invasive knee replacements.
- To assess the achievement of the desired 5-7 degree dorsal slope for knee monosleds.
Main Methods:
- Implantation of 50 St Georg medial knee monosleds and Uniglide prostheses using minimally invasive techniques.
- Postoperative investigation of tibial component alignment and dorsal slope using a navigation system.
Main Results:
- Restored leg axes to within -3 to +3 degrees, correcting initial malalignments.
- Achieved the target 5-7 degree dorsal slope, with an average of 5.3 degrees.
- Ensured correct anterior-posterior alignment of femoral and tibial components.
Conclusions:
- Navigation systems enhance accuracy and reproducibility of tibial dorsal slope in knee monosled surgery.
- Navigation systems help avoid leg axis overcorrection and the use of excessively high medial onlays.
- The navigation system reliably monitors cuts, contributing to improved surgical outcomes.
