Abstract
This paper describes two new functions—automatic femoral movement and interbony distance measure that have been required by surgeons to improve the efficiency of surgical planning for hipjoint with computer. By these functions we provide surgeons an automatic simulation procedure to fit femur into pelvis that will increase the contact area, and also a new method to measure the distance between femur and pelvis from X-ray CT images. We also discuss the error in this measurement method and show some photos of a pre-operative surgical planning with the new functions. According to the surgeon who has used the new functions, they work efficiently for pre-operative diagnosis and surgical planning.
