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Process for making custom joint replacements

  • US 5,274,565 A
  • Filed: 10/03/1990
  • Issued: 12/28/1993
  • Est. Priority Date: 10/03/1990
  • Status: Expired due to Fees
First Claim
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1. A process for forming a prosthesis related to bone structure internal to a body comprising the steps of:

  • a. providing CT scan data corresponding to the bone structure and surrounding tissue, said CT scan data including radiological density values for discrete points of said bone structure and surrounding tissue in each scan of said CT scan data;

    b. deriving a radiological density gradient value for said discrete points with respect to neighboring points in each scan;

    c. forming the inner and outer contours of said bone structure using said discrete points'"'"' density values and density gradient values in each scan to form contoured bone data;

    d. displaying a graphic model of said bone using said contoured bone data of at least some of the formed inner and outer contours;

    e. developing a set of digital data for a surface model representing said graphic model; and

    f. using the surface model to generate numerical control machine instructions for making said prosthesis.

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