Abstract: A surgery assistance system including: a physically suitable jig to be attached to a predetermined attached portion of a body on which surgery is to be performed; and a surgery assistance device which displays an augmented reality image. The physical suitable jig includes: a site fitting unit that can be fitted with the predetermined attached portion; and an image-recognizing unit including features that can be image-recognized to display the augmented reality image with the surgery assistance device.

Abstract: A surgery assistance system including: a physically suitable jig to be attached to a predetermined attached portion of a body on which surgery is to be performed; and a surgery assistance device which displays an augmented reality image. The physical suitable jig includes: a site fitting unit that can be fitted with the predetermined attached portion; and an image-recognizing unit including features that can be image-recognized to display the augmented reality image with the surgery assistance device.

Abstract: CT images near the pelvis are obtained before surgery, and a three-dimensional model of a pelvis part is created on a computer. The virtual three-dimensional bone model is used to plan an installation position of a guide instrument etc., and a virtual three-dimensional surgical site model including the guide instrument is constructed. Subsequently, during surgery, the guide instrument is installed, and three-dimensional images of a surgical site are obtained, and a measured three-dimensional surgical site model including the guide instrument is obtained. The virtual three-dimensional surgical site model and the measured three-dimensional surgical site model are compared, and an error between an ideal installation position of the guide instrument and an actual installation position of the guide instrument is detected to guide the operator to reduce the error.

Abstract: A body position fixing apparatus includes an indicating rod and a rotation mechanism that supports the indicating rod to make the indicating rod rotatable at a discretionary angle relative to each of the placement surface and a fixed reference plane including the first pressing surface, the second pressing surface, and the third pressing surface.