ARTHROPLASTY JIG

摘要

A method and system for performing a total joint arthroplasty procedure on a patient's damaged bone region. A CT image or other suitable image is formed of the damaged bone surfaces, and location coordinate values (xn,yn,zn) are determined for a selected sequence of bone surface locations using the CT image data. A mathematical model z=f(x,y) of a surface that accurately matches the bone surface coordinates at the selected bone spice locations, or matches surface normal vector components at selected bone surface locations, is determined. The model provides a production file from which a cutting jig and an implant device (optional), each patient-specific and having controllable alignment, are fabricated for the damaged bone by automated processing. At this point, the patient is cut open (once), the cutting jig and a cutting instrument are used to remove a selected portion of the bone and to provide an exposed planar surface, the implant device is optionally secured to and aligned with the remainder of the bone, and the patient's incision is promptly repaired.

主权项

1. A device configured to guide a transverse resection in a non-resected bone surface in a knee region of a leg bone during an arthroplasty, the transverse resection creating a resection planar surface in the non-resected bone surface, the resection planar surface including a resection position that allows the arthroplasty to be completed such that an implant preoperatively selected for implantation via the arthroplasty has an implanted position on the leg bone, the implanted position being determined in a preoperative analysis of the leg bone and the implant prior to the manufacturing of the device and prior to the device being brought into contact with the non-resected bone surface or employed in the arthroplasty, a relationship of the resection position relative to the non-resected bone surface being determined during the preoperative analysis when a representation of the implant and an image of the leg bone are superimposed via a computer, the relationship becoming part of a production file used in the manufacture of the device, the device comprising:
a mating surface configured to engage the non-resected bone surface in a matching manner on account of a patient-specific nature of the mating surface, the matching manner registering a single relative position of the mating surface relative to the non-resected bone surface, the patient specific nature of the mating surface having been generated in the device prior to the device being brought into contact with the bone surface or employed in the arthroplasty; and a cutting instrument guide comprising a guide position with a relationship relative to the non-resected bone surface when the non-resected bone surface is engaged by the mating surface in the matching manner, the relationship of the guide position relative to the non-resected bone surface mimicking the relationship of the resection position relative to the non-resected bone surface, the guide position preoperatively generated in the device prior to the device being brought into contact with the non-resected bone surface or employed in the arthroplasty.