Description
The high tibial osteotomy (HTO) is used for knee osteoarthritis in which a wedge of bone is excised from the tibial plate at the point of greatest contact with the femur. Thus, it is possible to redistribute the weight and decrease cartilaginous wear.
With HTO it is possible to reduce knee pain by transferring weight-bearing loads to the relatively unaffected lateral compartment in varus knees and to delay the need for a knee replacement by slowing or stopping the destruction of the medial joint compartment. This procedure allows measuring the correction angle of an HTO.
Measurements
The measurements made by the procedure are displayed in the image:
- Mechanical Lateral Distal Femoral Angle (mLDFA): the angle between the tangent line to the femoral condyles and the femoral mechanical axis, measured on the lateral side;
- Mechanical Tibiofemoral Angle (mTFA): the angle between the femoral and tibial mechanical axis;
- Joint Line Congruence Angle (JLCA): the angle between the tangent lines of the femoral and tibial condyles;
- Mechanical Medial Proximal Tibial Angle (mMPTA): the angle between the tangent line of the tibial condyles and the tibial mechanical axis, measured on the medial side;
- Weight Bearing Percentage (WBP): percentage where the weight-bearing line crosses the tibial plateau line;
- Joint Line Obliquity (JLO): the angle between the tibial plateau line and the horizontal plane of the image.
How to perform
After selecting this procedure in the sidebar, as well as, the side where you will perform the procedure, you must mark the points to conclude it. To see the caption of each point you need to click on this button 
Beware: you can change the position of the points at this stage or later. To do this, simply click on each handle with the left mouse button and move them to the most suitable position.
For advanced configuration, please follow the instructions below.
Advanced Configuration
After the correct positioning of the HTO, it is possible to perform a cut automatically using this option in the Object edition. By clicking on the Auto osteotomy button, PeekMed® will automatically perform the correction according to the options selected in this window.
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