The user digitizes certain anatomic landmarks or contours of the leg and knee from an x-ray. From this, a model can be reconstructed and the user can interactively choose various angles and locations for the osteotomy wedge. When the userchanges the angle or type of osteotomy, the program calculates various data. What we are primarily interested in is how simulated osteotomies which change the angle of the knee joint, change the distribution of forces along the contact surfaces of the joint. Here is an example of a preoperative simulation and its corresponding closed double osteotomy simulation.
Oasis can also simulate upper-tibial or supracondylar single osteotomies.
You may want to enlarge your screen. The large blue arrow demonstrates the loading direction. The dotted line represents the mechanical axis. The lines on the medial and lateral aspects of the knee represent the medial and lateral collateral ligaments, respectively. The green color designates a ligamentous tension of zero and the blue colordesignates a positive ligamentous tension.