Orthopaedic Implant and Method of Installing Same

• US 20140277521A1
• Filed: 03/13/2013
• Published: 09/18/2014
• Est. Priority Date: 03/13/2013
• Status: Active Grant

• Current Assignee: Depuy Synthes Products Incorporated (Johnson & Johnson)
• Original Assignee: Depuy Synthes Products Incorporated (Johnson & Johnson)
• Inventors: Chavarria, Jason M., Anthony, Sarah M.
• Granted Patent: US 8,968,409 B2
• Time in Patent Office: Days
• US Class Current: 623/19.13
• CPC Class Codes: A61B 17/68 Internal fixation devices , including fasteners and spinal fixators, even if a part thereof projects from the skin bone staples A61B17/0642
• CPC Class Codes: A61B 17/746 the longitudinal elements coupled to a plate opposite the femoral head
• CPC Class Codes: A61B 17/80 Cortical plates , i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
• CPC Class Codes: A61B 17/8057 the interlocking form comprising a thread
• CPC Class Codes: A61B 17/8061 specially adapted for particular bones A61B17/70 and A61B17/74 take precedence
• CPC Class Codes: A61B 17/8605 Heads, i.e. proximal ends projecting from bone
• CPC Class Codes: A61B 17/8625 Shanks, i.e. parts contacting bone tissue
• CPC Class Codes: A61B 2017/564 Methods for bone or joint treatment
• CPC Class Codes: A61F 2/30 Joints
• CPC Class Codes: A61F 2/30749 Fixation appliances for connecting prostheses to the body
• CPC Class Codes: A61F 2/4003 Replacing only the epiphyseal or metaphyseal parts of the humerus, i.e. endoprosthesis not comprising an entire humeral shaft replacing only the epiphyseal or metaphyseal parts of the femur A61F2/3601
• CPC Class Codes: A61F 2/4014 Humeral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic humeral shafts
• CPC Class Codes: A61F 2002/30077 shrinkable
• CPC Class Codes: A61F 2002/30331 made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2002/30332 Conically- or frustoconically-shaped protrusion and recess
• CPC Class Codes: A61F 2002/30433 using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
• CPC Class Codes: A61F 2002/30777 Oblong apertures
• CPC Class Codes: A61F 2002/30787 inclined obliquely with respect to each other
• CPC Class Codes: A61F 2002/3092 having an open-celled or open-pored structure
• CPC Class Codes: A61F 2002/4007 implanted without ablation of the whole natural humeral head

Abstract

An orthopaedic implant comprises a fixation plate and an articulation component comprising a bearing surface and an opposing securement surface formed of a porous material. The orthopaedic implant further includes at least one fastener extending through the fixation plate and secured within the porous material of the securement surface of the articulation component.

Claims

1. An orthopaedic implant, comprising:

a fixation plate;

an articulation component comprising a bearing surface and an opposing securement surface formed of a porous material; and

at least one fastener extending through the fixation plate and secured within the porous material of the securement surface of the articulation component.

2. The implant of claim 1, wherein the articulation component further includes:

an articulation head having a convex outer surface forming the articulation surface and a reverse surface opposite the convex outer surface; and

a securement disk having an attachment surface that is disposed adjacent the reverse surface of the articulation head.

3. The implant of claim 2, wherein the securement disk further includes a securement surface and at least one radial slot formed in the securement surface and adapted to accept the at least one fastener.

4. The implant of claim 3, wherein a shorter fastener is secured within the radial slot near an inner edge of the slot and a longer fastener is secured within the radial slot near an outer edge of the slot, thereby allowing flexibility in the length of fastener used with the articulation component.

5. The implant of claim 3, wherein the radial slot extends into the securement disk between the securement surface and the attachment surface.

6. The implant of claim 5, wherein the radial slot includes at least one wall along extending outwardly from at least a portion of a perimeter of the slot, wherein the fastener engages the at least one wall and a wall forming the slot to retain the fastener within the slot.

7. The implant of claim 6, further including a plurality of fasteners and a plurality of radial slots within the securement disk, wherein each of the plurality of fasteners is secured within a respective radial slot of the plurality of radial slots.

8. The implant of claim 2, wherein the securement disk is formed of titanium foam.

14. The implant of claim 8, wherein the securement disk is formed of titanium foam.

9. An orthopaedic implant, comprising:

an articulation head comprising a bearing surface and a reverse surface; and

a securement disk comprising;

an attachment surface attached to at least a portion of the reverse surface of the articulation head;

a securement surface opposite the attachment surface and adapted for coupling to a fixation plate secured to a bone; and

at least one opening formed in the securement surface of the securement disk and adapted to accept fasteners therein;

wherein the securement disk comprises a porous material.

10. The implant of claim 9, wherein the at least one opening is in the form of a radial slot formed in the securement surface and adapted to accept fasteners.

11. The implant of claim 10, wherein a shorter fastener is secured within the radial slot near an inner edge of the slot and a longer fastener is secured within the radial slot near an outer edge of the slot, thereby allowing flexibility in the length of fasteners used with the articulation component.

12. The implant of claim 10, wherein the radial slot extend into the securement disk between the securement surface and the attachment surface.

13. The implant of claim 10, wherein the radial slot includes at least one wall along extending outwardly from at least a portion of a perimeter of the slot, wherein the fastener engages the at least one wall and a wall forming the slot to retain the fastener within the slot.

15. A method of installing an orthopaedic implant, the method comprising the steps of:

selecting at least a fixation plate and a set of fasteners for a patient, wherein the fixation plate and the set of fasteners correspond to the natural anatomy of a patient;

accessing the fractured bone;

assessing the extent of fracture of the bone; and

if the extent of the fracture is at a first level, utilizing the fixation plate, an articulation component selected based on the patient'"'"'s natural anatomy, and the set of fasteners to replace a portion of the fractured bone;

or

if the extent of the fracture is at a second level different than the first level, utilizing only the fixation plate and the set of fasteners to repair the fractured bone.

17. The method of claim 15, wherein, if the fracture is at the first level, the method further includes the steps of:

removing a head of the fractured bone;

securing the fixation plate to a surface of the fractured bone;

positioning the articulation component in the place of the head;

aligning the articulation component with the fixation plate; and

inserting the fasteners through the fixation plate and the articulation component to secure the articulation component to the fixation plate.

18. The method of claim 17, further including the steps of:

selecting a set of fasteners having a length; and

securing the set of fasteners in radial slots formed in the articulation component;

wherein the structure of the articulation component forming the radial slots is formed of a porous material;

wherein the length of the set of fasteners and a placement of the fasteners within the radial slots determines a neck length.

19. The method of claim 17, wherein the aligning step includes the steps of:

inserting a first end of an instrument through a hole in the fixation plate; and

guiding the first end into a hole formed within the articulation component, thereby setting a neck length between the fixation plate and the articulation component and preventing rotation of the articulation component during placement of the fasteners.

20. The method of claim 15, wherein, if the fracture is at the second level, the method further includes the steps of:

securing the fixation plate to the bone; and

inserting the fasteners through the fixation plate and into a fractured native articulation component to secure the fractured native articulation component to the fixation plate.