Patient-specific augmented glenoid systems and methods

Patent metadata

Field	Value
Publication number	US-2018303618-A1
Application number	US-201816022248-A
Country	US
Kind code	A1
Filing date	Jun 28, 2018
Priority date	Apr 24, 2015
Publication date	Oct 25, 2018
Grant date	—

Abstract

A glenoid implant comprises a body comprising: an articular surface and a scapula-engaging surface, the scapula-engaging surface including first and second portions angled relative to each other; and a fixation feature extending from the scapula-engaging surface. A method comprises: forming a planar bone surface at a glenoid using a guide pin; forming a first bore into the glenoid located near the guide pin; forming a second bore into the glenoid offset from the first bore; inserting an augment ream guide into the first and second bores; and forming an angled bone surface at the glenoid relative to the planar bone surface using the augment ream guide. A ream guide comprises: a base having first and second surfaces; a bone peg extending from the first surface; an alignment peg spaced from the bone peg; and a guide peg extending from the second surface at an oblique angle to the bone peg.

First claim

1 .- 9 . (canceled)

10 . A method for implanting a scapular baseplate in a shoulder arthroplasty, the method comprising:
inserting a guide pin into a glenoid of the scapula using a guide instrument; preparing a first portion of the glenoid to form a planar bone surface using the guide pin; forming a first bore into the glenoid located approximately at the guide pin; forming a second bore into the glenoid offset from the first bore; inserting an augment ream guide into the first bore and the second bore; and preparing a second portion of the glenoid to form an angled bone surface relative to the planar bone surface using the augment ream guide.

11 . The method of claim 10 , wherein:
forming the first bore into the glenoid comprises positioning a reamer over the guide pin to ream the first bore while preparing the first portion of the glenoid; and forming the second bore into the glenoid comprises positioning a drill guide over the guide pin after removing the reamer and drilling the second bore.

12 . The method of claim 10 , wherein:
forming the first bore into the glenoid comprises positioning a boss and post reamer over the guide pin to ream the first bore after preparing the first portion of the glenoid; and forming the second bore into the glenoid comprises positioning a drill guide over the guide pin after removing the reamer and drilling the second bore.

13 . The method of claim 10 , wherein the guide instrument is patient-specific to mate with the glenoid.

14 . The method of claim 10 , wherein the guide instrument positions the guide pin approximately parallel to a main axis of a vault of the glenoid, the planar bone surface is approximately perpendicular to the main axis, and the angled bone surface is angled relative to the planar bone surface at an angle in the range of approximately ten degrees to approximately thirty degrees.

15 . The method of claim 10 , wherein preparing a first portion of the glenoid to form a planar bone surface comprises at least partially reaming the glenoid to approximately fifty percent of a surface area of the glenoid.

16 . The method of claim 10 , wherein preparing a first portion of the glenoid to form a planar bone surface comprises inserting a post of the augment ream guide into a notch in a reamer head and shaft of a reamer.

17 . The method of claim 10 , further comprising positioning a depth stop over the guide pin to limit a depth to which the glenoid can be reamed.

18 .- 20 . (canceled)

21 . The method of claim 11 , wherein positioning the drill guide over the guide pin after removing the reamer comprises orienting an angular position of a ream guide in the drill guide for the second bore relative to the guide pin and an edge of the planar bone surface.

22 . The method of claim 10 , further comprising using an augment sizer attached to the guide pin to evaluate if additional bone should be removed from the glenoid, where using the augment sizer comprises:
engaging a first portion of the augment sizer with the planar bone surface; and determining if a finger extending from the augment sizer beyond the first portion engages a non-reamed portion of the glenoid.

23 . The method of claim 10 , further comprising implanting the scapular baseplate onto the glenoid, the scapular baseplate including a first surface configured to engage the planar bone surface and a second surface configured to engage the angled bone surface.

24 . A method for implanting a scapular baseplate having an angled scapula-engaging surface in a shoulder arthroplasty, the method comprising:
inserting a guide pin into a glenoid of the scapula using a guide instrument; preparing a first portion of the glenoid to form a planar bone surface using the guide pin such that the planar bone surface is approximately perpendicular to a main axis of a vault of the glenoid; forming a first bore into the glenoid located approximately at the guide pin; forming a second bore into the glenoid offset from the first bore and having an angular position relative to the guide pin opposite a defective portion of the glenoid; inserting an augment ream guide into the first bore and the second bore, the augment ream guide including a post extending away from the glenoid at an angle relative to the main axis of the vault toward the defective portion of the glenoid; and preparing a second portion of the glenoid to form an angled bone surface relative to the planar bone surface using the post of the augment ream guide to remove the defective portion of the glenoid.

25 . The method of claim 24 , wherein forming the first bore into the glenoid comprises positioning a reamer over the guide pin to ream the first bore while preparing the first portion of the glenoid.

26 . The method of claim 24 , wherein forming the second bore into the glenoid comprises:
positioning a drill guide over the guide pin after removing the reamer and drilling the second bore; orienting the drill guide against the glenoid to locate a position for the second bore in the planar bone surface; and drilling the second bore into the glenoid using a drill bit guided by the drill guide.

27 . The method of claim 24 , wherein inserting the guide pin into the glenoid of the scapula using the guide instrument comprises mating a patient-specific surface of the guide instrument against the glenoid and inserting the guide pin through the guide instrument.

28 . The method of claim 24 , further comprising using an augment sizer attached to the guide pin to evaluate if additional bone should be removed from the glenoid at the planar bone surface.

29 . A method for implanting a scapular baseplate in a shoulder arthroplasty, the method comprising:
preparing a first, non-defective portion of a glenoid of a shoulder to form a planar bone surface such that the planar bone surface is approximately perpendicular to a main axis of a vault of the glenoid; forming a first bore in the glenoid at the main axis of the vault; forming a second bore in the glenoid at the planar bone surface; coupling an augment ream guide to the first and second bores; and preparing a second, defective portion of the glenoid to form an angled bone surface relative to the planar bone surface using the augment ream guide.

30 . The method of claim 29 , wherein:
coupling the augment ream guide to the first and second bores comprises inserting a bone peg of the ream guide into the first bore and inserting an alignment post of the ream guide into the second bore; and preparing the second, defective portion of the glenoid to form the angled bone surface relative to the planar bone surface using the augment ream guide comprises sliding a reamer along an angled guide peg extending from the augment ream guide away from the bone peg and the alignment post.

31 . The method of claim 29 , wherein the planar bone surface and the first bore are simultaneously formed using a reamer attached to a guide pin attached to the glenoid at the main axis.

32 . The method of claim 29 , further comprising sliding an augment sizer along a guide pin attached to the glenoid at the main axis to determine if additional bone should be removed from the glenoid at the planar bone surface by evaluating if a finger of the augment sizer contacts an un-reamed portion of the glenoid when the augment sizer contacts the planar bone surface.

Assignees

• Biomet Mfg Llc

Inventors

• Kovacs Michael Francis
• Vanasse Thomas M
• Gulotta Lawrence

Classifications

• A61F2/4612

  of shoulders · CPC title

• A61F2/4081

  Glenoid components, e.g. cups · CPC title

• A61F2002/30774

  internally-threaded · CPC title

• A61F2002/30617

  Visible markings for adjusting, locating or measuring · CPC title

• A61B17/1778

  for the shoulder · CPC title