Last updated on July 6 2022
Description
Medial patellofemoral ligament (MPFL) is a band of tissue that extends from the femoral medial epicondyle to the superior aspect of the patella. MPFL is the major ligament that stabilizes the patella and helps in preventing patellar subluxation (partial dislocation) or dislocation. This ligament can rupture or get damaged when there is patellar lateral dislocation. During the MPFL reconstruction procedure, the orthopedic surgeon replaces the injured ligament with a tendon, taken from the patient’s hamstring or donor tissue, and creates a new ligament. The graft should be placed isometrically to prevent it from overstretching and causing failure during joint movements.
This procedure allows the surgeon to verify if the reconstruction of the MPFL will not compromise the knee range of motion.
Measurements
The measurements made by the procedure are displayed in the image: 
- Total Distance (TD): total length of the future medial patellofemoral ligament.
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 MPFL points, it is possible to study the impact of the new ligament position using Object edition.
After clicking on this button, it is possible to cut a fragment or to select an existing fragment of the patella, taking into consideration if a CR, a CT (segmented or not-segmented) or an MRI is being used.
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