The Effect of Anteromedial Tibial Cortex Angle on Change of Posterior Tibial Slope Angle in PTO(Proximal Tibial Osteotomy) using Computer Assisted Surgery(CAS)

Computer Assisted Surgery(CAS)를 이용한 개방형 쐐기 근위경골 절골술에서 전내측 경골피질경사각이 후방경골경사각의 변화에 미치는 영향

An upper tibial opening wedge osteotomy is an operation to cure a malalignment and a degenerate arthritis. To prevent the postoperative malalignment caused by the upper tibial opening wedge osteotomy, the research to define the relationship between a Hinge Axis Angle and a Posterior Slope Angle is needed. The effect of the relationship between the hinge axis angle and the gap angle on the posterior slope angle is studied. After 3-D Compute Tomography (CT) scanning image is reconstructed, the virtual surgery is performed by the reconstructed 3-D tibia model. It was proved that the relationship between the hinge axis angle and the gap angle were constant and the simple mathematical model could be derived. To verify the suggested mathematical model, it compared with the measured data from the virtual surgery. In conclusion, while the deviation between the data from the virtual surgery and ones of the mathematical model under the gap angle<$10^{\circ}$ was less than 1%.