Tibial plateau caster angle determining device

The invention provides a tibial plateau caster angle determination device, and the device comprises an obtaining module which is used for obtaining a first plane where the lowest point of a tibial plateau in a three-dimensional tibial image is located; the first plane is parallel to the cross section of the three-dimensional tibia image; the first determination module is used for determining a target area containing the tibial plateau and an intersection line corresponding to the first plane; the second determining module is used for rotating the first plane by a preset angle for M times in a preset direction by taking the intersection line as an axis to obtain M rotating planes; the calculation module is used for calculating the sum value of Mahalanobis distances from all points in the target area to the rotation plane for each rotation plane; the third determining module is used for determining the included angle between the rotating plane with the minimum sum value of the mahalanobis distances and the firs