Patient-specific acetabular guide for anterior approach

• US 9,060,788 B2
• Filed: 12/11/2012
• Issued: 06/23/2015
• Est. Priority Date: 12/11/2012
• Status: Active Grant

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Inventors: Bollinger, Mark A.
• Primary Examiner(s): BECCIA, CHRISTOPHER J
• Application Number:
  US13/711,306
• Publication Number:
  US 20140163564A1
• Time in Patent Office: 924 Days
• Field of Search: 606/89, 606/19, 606/71, 606/91, 623 2118- 2211
• US Class Current: 1/1
• CPC Class Codes: A61B 17/1666 for the acetabulum
• CPC Class Codes: A61B 17/1746 for the acetabulum
• CPC Class Codes: A61B 2017/568 produced with shape and dimensions specific for an individual patient

Abstract

An orthopedic device includes a patient-specific acetabular guide that can be used for preparing an acetabulum of a patient to receive an acetabular implant. The acetabular guide has a dome-shaped body with a peripheral annular rim and an outer three-dimensional surface configured to match an acetabulum of a specific patient'"'"'s hip joint from three-dimensional medical images of the patient'"'"'s hip joint. A patient-specific registration guide is removably attached to the peripheral rim and has a longitudinal bore defining a patient-specific alignment axis with an alignment orientation configured for guiding an acetabular implant for the patient. The registration guide has a patient-specific undersurface configured to mate with a corresponding surface of periacetabular surface of the acetabulum of the patient.

Claims

1. An orthopedic device for hip joint arthroplasty comprising:

a patient-specific acetabular guide having a dome-shaped body that includes a peripheral annular rim and an outer three-dimensional surface configured to match an acetabulum of a specific patient'"'"'s hip joint, wherein the outer three-dimensional surface is reconstructed from three-dimensional medical images of the specific patient'"'"'s hip joint according to a preoperative plan for the specific patient;

a patient-specific registration guide configured to be removably attached to the peripheral rim and having surface that defines a longitudinal bore defining a patient-specific alignment axis with an alignment orientation configured for guiding an acetabular implant for the specific patient, the registration guide having a patient-specific undersurface configured to mate with a corresponding surface of periacetabular surface of the acetabulum of the specific patient according to the preoperative plan for the specific patient; and

a removable drill insert received in the longitudinal bore of the registration guide, wherein the removable drill insert includes an insert bore received concentrically within the longitudinal bore for guiding drilling along the alignment axis exterior to the patient-specific acetabular guide.

2. The orthopedic device of claim 1, further comprising a registration hook extending from and attached to the peripheral rim of the acetabular guide, the registration hook having a patient-specific undersurface configured to mate with a corresponding surface of acetabular rim of the specific patient according to the preoperative plan for the specific patient.

3. The orthopedic device of claim 1, further comprising a plurality of spaced-apart registration hooks or flanges, each registration hook extending from and attached to the peripheral rim of the acetabular guide, each registration hook having a patient-specific undersurface configured to mate with a corresponding surface of acetabular rim of the specific patient'"'"'s acetabulum according to the preoperative plan for the specific patient.

4. The orthopedic device of claim 1, wherein the acetabular guide further comprises one or more openings configured as viewing windows.

5. The orthopedic device of claim 1, wherein the acetabular guide further comprises one or more fixation holes for interacting with the acetabular guide to attach the acetabular guide to the specific patient.

6. The orthopedic device of claim 1, wherein the longitudinal bore of the registration guide has an elongated slit configured to allow removal of the acetabular guide without removing a guiding pin passing through the longitudinal bore and affixed to the acetabulum of the specific patient.

7. The orthopedic device of claim 1, wherein the registration guide and the drill insert form an elongated slit configured to allow removal of the acetabular guide without removing a guiding pin passing through the registration guide and affixed to the acetabulum.

8. The orthopedic device of claim 1, wherein the patient-specific acetabular guide includes a first post extending centrally from an inner surface of the dome-shaped body.

9. The orthopedic device of claim 8, wherein the patient-specific acetabular guide includes a second post extending from the inner surface of the dome-shaped body and offset relative to the first post.

10. The orthopedic device of claim 9, further comprising an inserter having a removable adapter element configured to engage the first post and the second post of the patient-specific acetabular guide.

11. The orthopedic device of claim 10, wherein the adapter element includes a bore removably coupleable to the first post of the acetabular guide.

12. The orthopedic device of claim 11, wherein the adapter element includes first and second flanges removably holding the second post of the acetabular guide therebetween.

13. The orthopedic device of claim 1, wherein the peripheral annular rim of the dome-shaped body has a wavy surface configured to follow a corresponding adjacent surface of the acetabular rim of the specific patient according to the preoperative plan for the specific patient.

14. An orthopedic device for hip joint arthroplasty comprising:

a patient-specific acetabular guide having a dome-shaped body with a peripheral annular rim and an outer three-dimensional surface configured to match an acetabulum of a specific patient'"'"'s hip joint, wherein the outer three-dimensional surface is reconstructed from three-dimensional medical images of the patient'"'"'s hip joint according to a preoperative plan for the specific patient;

a patient-specific registration guide configured to be removably attached to the peripheral rim and having a longitudinal bore exterior to the acetabulum defining a patient-specific alignment axis with an alignment orientation configured for guiding an acetabular implant for the specific patient within the acetabulum, the registration guide having a patient-specific undersurface configured to mate with a corresponding surface of a periacetabular surface of the acetabulum of the specific patient according to the preoperative plan for the patient;

a plurality of spaced-apart registration hooks, each registration hook extending from and attached to the peripheral rim of the acetabular guide, each registration hook having a patient-specific undersurface configured to mate with a corresponding surface of an acetabular rim of the specific patient acetabulum according to the preoperative plan for the specific patient; and

a removable drill insert received in the longitudinal bore of the registration guide wherein the removable drill insert includes an insert bore received concentrically within the longitudinal bore for guiding drilling drill bit along the alignment axis exterior to the specific acetabulum.

15. The orthopedic device of claim 14, wherein the patient-specific acetabular guide includes a first post extending centrally from an inner surface of the dome-shaped body and a second post extending from the inner surface of the dome-shaped body and offset relative to the first post.

16. The orthopedic device of claim 15, further comprising an adapter element having a distal portion configured to removably engage the first and second posts and a proximal portion configured to be removably coupled to an inserter shaft.

17. A method for hip joint arthroplasty comprising:

inserting a patient-specific acetabular guide into an acetabulum of a patient such that a patient specific undersurface of a dome-shaped body of the acetabular guide mates as negative of a corresponding surface of the acetabulum and mating at least one patient-specific registration hook that extends from a peripheral rim of the acetabular guide to and over a portion of an acetabular rim of the acetabulum;

inserting an alignment pin into the patient'"'"'s bone through a bore of a patient-specific registration guide removably attached to the peripheral rim of the acetabular guide, the registration guide preoperatively configured to define a patient-specific alignment orientation for inserting an acetabular implant;

removing the acetabular guide without removing the alignment pin; and

inserting an acetabular implant, after removing the acetabular guide, along an orientation parallel to the alignment pin.

18. The method of claim 17, wherein inserting the acetabular guide to the acetabulum comprises:

coupling the acetabular guide to a removable adapter element of an inserter by connecting a distal bore of the adapter element to a first post of the acetabular guide.

19. The method of claim 18, further comprising holding a second post of the acetabular guide between first and second flanges extending from the adapter element.