Acetabular cup prosthesis positioning instrument and method

  • US 9,987,148 B2
  • Filed: 06/11/2014
  • Issued: 06/05/2018
  • Est. Priority Date: 06/11/2013
  • Status: Active Grant
First Claim
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1. A method for assisting in positioning the acetabular cup comprising:

  • orienting a cup positioning instrument with a cup thereon in an initial reference orientation relative to an acetabulum of a pelvis with the cup forming a joint with the acetabulum, the cup positioning instrument comprising an inertial sensor unit with pre-planned orientation data for a desired cup orientation based on at least one landmark of the pelvis, the pre-planned orientation data including calibration data programmed before said orienting using pre-operative imaging of the pelvis to set the initial reference orientation of the cup positioning instrument geometrically relative to the pelvis, the calibration data geometrically relating the cup positioning instrument in the initial reference orientation to the at least one landmark of the pelvis as pre-planned;

    calibrating the inertial sensor unit in the initial reference orientation using the calibration data;

    rotating the cup positioning instrument to a desired abduction angle as guided by an interface of the cup positioning instrument, based on movements relative to at least one landmark as tracked by the inertial sensor unit;

    rotating the cup positioning instrument to a desired anteversion angle as guided by the interface of the cup positioning instrument, based on movements relative to the at least one landmark as tracked by the inertial sensor unit; and

    upon reaching the desired cup orientation as indicated by the interface, impacting the cup into the acetabulum.

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