Topic Computer invocation surgical operation system 170 in order to guide positioning of the ilium mortar cup to inside the Pelvis, offer method and instrument 300.SolutionsPosition of the ilium mortar intersection ligament of the Pelvis and position of the ilium mortar joint lip of the Pelvis are measured. The ilium mortar joint lip and direction of the ilium mortar surface which includes the ilium mortar intersection ligament are calculated. Planned position for the ilium mortar cup where the entrance surface of the ilium mortar cup almost is parallel to the ilium mortar surface is decided. Instrument 300, installation tool and backing in order to install this instrument in the patient and the length direction axis being the guide who decides 302, guide has with 306 in order to accommodate the other instrument which supports the ilium mortar cup in plant and adjustment mechanism 320. With adjustment mechanism, be able to adjust the axis where two differs at least, on the center inclination of the length direction axis and it is possible with that angular direction of the guide to change turning or leaning forward. Selective figure Figure 5
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