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Virtual trial reduction system for hip arthroplasty and coordinate systems therefor

  • US 8,078,254 B2
  • Filed: 06/01/2004
  • Issued: 12/13/2011
  • Est. Priority Date: 06/02/2003
  • Status: Active Grant
First Claim
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1. A method for providing, without using a patient tracker, a patient-specific pelvic coordinate system from a single near AP intra-operative image of the patient, said method comprising:

  • forming a single intra-operative fluoroscopic image of the patient'"'"'s pelvis in the near AP direction using an x-ray source;

    defining first and second landmarks on anatomically separated regions of said pelvis on said image, said landmarks being separated from each other in at least an anterior-posterior direction;

    determining the transaxial displacement of said landmarks on said image;

    determining the axial displacement of said landmarks on said image;

    calculating by a processor the axial rotation of the pelvis using the transaxial displacement as a measure of the axial rotation of said pelvis with respect to the plane of said image, andcalculating by a processor the transaxial rotation of the pelvis using said axial displacement as a measure of the transaxial rotation of said pelvis with the respect to the plane of said image.

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