Patient-specific glenoid implant

Patent metadata

Field	Value
Publication number	US-2016166392-A1
Application number	US-201615053229-A
Country	US
Kind code	A1
Filing date	Feb 25, 2016
Priority date	Dec 3, 2013
Publication date	Jun 16, 2016
Grant date	—

Abstract

The present disclosure describes a glenoid implant including a body and a fixation member. The body has an articular surface and a scapula-engaging surface opposite from the articular surface. At least a portion of the scapula-engaging surface is configured to mirror and conform to a surface of a scapula of a specific patient based on a three-dimensional (3D) model of the scapula. The fixation member extends from the scapula-engaging surface for fixing the glenoid implant to the scapula.

First claim

1 . A method of manufacturing a glenoid implant, comprising:
obtaining a three-dimensional (3D) model of a scapula of a specific patient; designing the glenoid implant to have an articular surface and a scapula-engaging surface opposite from the articular surface that mirrors and conforms to a surface of the scapula based on the 3D model of the scapula such that the glenoid implant nestingly engages the scapula in only one orientation, the scapula-engaging surface including:
a patient-specific, bone-filling protrusion; and
a patient-specific fixation member; and
forming the glenoid implant.

2 . The method of claim 1 , wherein the patient-specific, bone-filling protrusion is configured to fill a defect in the surface of the scapula based on the 3D model of the scapula.

3 . The method of claim 1 , wherein the patient-specific fixation member extends from the scapula-engaging surface and has a length, diameter, orientation, and location that are patient-specific.

4 . The method of claim 1 , wherein designing the glenoid implant includes designing a size, shape, placement, and inclination angle of the glenoid implant to be patient-specific.

5 . The method of claim 1 , wherein forming the glenoid implant includes forming the glenoid implant using additive manufacturing.

6 . A method of repairing a glenoid, comprising:
obtaining a three-dimensional (3D) model of a scapula of a specific patient; determining a size and a shape of an irregularly shaped defect in a glenoid of the scapula based on the 3D model of the glenoid; and based on the determination, fixing a patient-specific implant to the glenoid, wherein the patient-specific implant has a patient-specific bone-engaging surface including:
an irregularly shaped protrusion sized and shaped to fill the irregularly shaped defect; and
a patient-specific fixation member.

7 .- 8 . (canceled)

9 . The method of claim 6 , further comprising:
reaming a portion of the scapula adjacent the irregularly shaped defect in the glenoid to form a smooth bone surface; and fixing the patient-specific implant to the glenoid so that a smooth surface of the patient-specific bone-engaging surface adjacent the irregularly shaped protrusion engages the smooth bone surface.

10 . The method of claim 6 , further comprising:
evaluating bone structure of the scapula; determining a location in the glenoid for the patient-specific fixation member of the patient-specific implant to prevent the patient-specific fixation member from puncturing through a backside of the scapula; forming a hole in the scapula at the location to receive the fixation member and to preserve bone; and press fitting the patient-specific fixation member into the hole, the patient-specific fixation member having a patient-specific placement, length and diameter configured to mate with the location and the hole.

11 . A method of repairing a glenoid, the method comprising:
scanning a scapula with an imaging system; generating a three-dimensional model of the scapula from the scanning; designing a patient-specific implant from the three-dimensional model to fit a glenoid in the scapula while minimizing bone removal from the scapula, the patient-specific implant comprising:
an irregularly shaped protrusion configured to match a mirror-image of an unaltered bone void defect in the glenoid; and
a patient-specific fixation member sized and shaped to engage the scapula to ensure a press tit; and
fixing the implant to the glenoid with the patient-specific fixation member.

12 . The method of claim 11 , wherein designing the patient-specific implant comprises designing the implant to include:
a bone-engaging portion comprising:
the irregularly shaped protrusion;
the patient-specific fixation member; and
a smooth surface configured to match an altered surface of the glenoid; and
an articulating surface of the implant located opposite the bone-engaging portion.

13 . The method of claim 12 , further comprising reaming a portion of the scapula to form the altered surface of the glenoid.

14 . The method of claim 12 , wherein the irregularly shaped protrusion is located along an edge of the bone-engaging portion at a side surface of the implant connecting the articulating surface and the bone-engaging portion.

15 . The method of claim 12 , wherein fixing the implant comprises;
forming a hole at a patient-specific location on the glenoid; and inserting the patient-specific fixation member into the hole to yield a press fit.

16 . The method of claim 15 , wherein the patient-specific location is selected to avoid the patient-specific fixation member from puncturing through a backside of the scapula.

17 . The method of claim 15 , wherein designing the patient-specific implant comprises determining patient-specific diameters for different axial portions of the patient-specific fixation member.

18 . The method of claim 17 , wherein the patient-specific diameters are selected to strengthen the press fit based on bone of the glenoid.

19 . The method of claim 15 , wherein designing the patient-specific implant comprises determining a patient-specific angle for the patient-specific fixation member.

20 . The method of claim 19 , wherein the patient-specific angle is selected to position the articulation surface at an anatomically correct orientation.

21 . The method of claim 15 , wherein designing the patient-specific implant comprises determining a patient-specific length for the patient-specific fixation member.

22 . The method of claim 21 , wherein the patient-specific length is selected to avoid the patient-specific fixation member from puncturing through a backside of the scapula.

Assignees

• Biomet Mfg Llc

Inventors

• Vanasse Thomas M
• Kehres Clinton E
• Taylor Robert

Classifications

• A61F2002/30322

  differing in surface structures · CPC title

• A61F2/30942 Primary

  for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques · CPC title

• A61F2002/30891

  Plurality of protrusions · CPC title

• A61F2002/30971

  Laminates, i.e. layered products · CPC title

• A61F2/30767

  Special external or bone-contacting surface, e.g. coating for improving bone ingrowth · CPC title