Patient specific instrumentation (PSI) for orthopedic surgery and systems and methods for using X-rays to produce same

  • US 9,924,950 B2
  • Filed: 09/25/2014
  • Issued: 03/27/2018
  • Est. Priority Date: 09/25/2013
  • Status: Active Grant
First Claim
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1. A method of creating a patient specific instrument for use in knee replacement surgery, the method comprising:

  • performing at least two two-dimensional X-ray scans of one or more bones, each of the two-dimensional X-ray scans being taken from different angular positions, the different angular positions being substantially perpendicular to each other;

    generating a digital bone model of said one or more bones based solely on the two-dimensional X-ray scans;

    planning the patient specific instrument based on the digital bone model, including determining locations for one or more anchor points on the patient specific instrument which are adapted to abut a surface of said one or more bones, the determined locations of the one or more anchor points being disposed on the patient specific instrument corresponding to areas of expected high accuracy on the digital bone model generated by the two-dimensional X-ray scans, said areas of expected high accuracy including at least a peripheral bone contour in at least one of said angular positions; and

    producing the patient specific instrument having said one or more anchor points thereon.

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