Tibal plateau leveling osteotomy plate

• US 20070233106A1
• Filed: 02/24/2006
• Published: 10/04/2007
• Est. Priority Date: 02/24/2006
• Status: Active Grant

• Current Assignee: Depuy Synthes Products Incorporated (Johnson & Johnson)
• Original Assignee: Synthes USA LLC (Johnson & Johnson)
• Inventors: Horan, Timothy, Touhalisky, Daneen, Scholl, Christopher
• Granted Patent: US 8,523,921 B2
• Time in Patent Office: Days
• US Class Current: 606/282
• 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

Abstract

An improved tibial plateau leveling osteotomy plate is disclosed. The plate is contoured in its proximal head portion to more closely resemble the structure of the tibial bone segment that is cut and rotated during the procedure. The plate also preferably has screw holes in the proximal head portion that are machined through the pre-contoured proximal head portion and are designed to angle the screw in a targeted screw path with respect to the osteotomy.

Claims

1. A bone plate dimensioned for securing two tibial bone segments of an animal as part of a tibial leveling osteotomy procedure for an animal, the bone plate comprising:

a distal portion comprising an elongated shaft having disposed therein a plurality of distal portion screw holes each designed to accept a screw;

a proximal portion having an upper surface and a bone-contacting surface opposite the upper surface, the bone-contacting surface being pre-contoured to be configured and dimensioned to conform to a tibial bone segment and being partially defined by a cylinder;

a plurality of proximal portion screw holes located in the proximal portion that were machined through the pre-contoured bone-contacting surface, the proximal portion screw holes being designed to accept a locking screw, whereby locking screws anchored through the proximal portion screw holes will have a targeted screw path through the tibial bone segment.

2. The bone plate of claim 1 wherein the proximal portion has a first screw hole that is designed to accept a first locking screw that has a targeted screw path that angles away from the bone-contacting surface of the proximal portion in a distal direction.

3. The bone plate of claim 2 wherein the screw path for the first locking screw also angles caudally away from the bone-contacting surface.

4. The bone plate of claim 2 wherein the proximal portion has a second screw hole that is located distally and cranially from the first screw hole and is designed to accept a second locking screw that has a targeted screw path that angles caudally away from the bone-contacting surface.

5. The bone plate of claim 2 wherein the proximal portion has a second screw hole that is located distally and caudally from the first screw hole and is designed to accept a second locking screw that has a targeted screw path that angles cranially away from the bone-contacting surface.

6. The bone plate of claim 1 wherein the first screw hole is a superior screw hole and the proximal portion has a cranial screw hole that is located distally and cranially from the first screw hole and is designed to accept a cranial locking screw that has a targeted screw path that angles caudally away from the bone-contacting surface, and the proximal portion has a caudal screw hole that is located distally and caudally from the first screw hole and is designed to accept a caudal locking screw that has a targeted screw path that angles cranially away from the bone-contacting surface.

7. The bone plate of claim 6 wherein the screw path for the superior screw hole also angles caudally away from the bone-contacting surface.

8. The bone plate of claim 7 wherein the bone-contacting surface is contoured in the shape of a cylinder.

9. The bone plate of claim 8 wherein the radius of the cylinder that defines at least part of the bone-contacting surface of the proximal portion of the plate is between about 18 mm and about 24 mm.

10. The bone plate of claim 8 wherein the radius of the cylinder that defines at least part of the bone-contacting surface of the proximal portion of the plate is between about 22 mm and about 30 mm.

11. The bone plate of claim 8 wherein the radius of the cylinder that defines at least part of the bone-contacting surface of the proximal portion of the plate is between about 12 mm and about 20 mm.

12. A bone plate for securing two tibial bone segments as part of a tibial leveling osteotomy procedure for an animal, the bone plate comprising:

a distal portion comprising an elongated shaft having disposed therein a plurality of screw holes each designed to accept a screw; and

a proximal portion comprising at least three screw holes each designed to accept a screw wherein a first screw hole is a superior screw hole, a second screw hole is a cranial screw hole located distally and cranially from the superior screw hole, and a third screw hole is a caudal screw hole located distally and caudally from the superior screw hole.

13. The bone plate of claim 12 wherein the cranial screw hole is located between about 3.5 mm and about 6 mm distally from the superior screw hole and the caudal screw hole is located about 6 mm to about 9 mm distally from the superior screw hole.

14. The bone plate of claim 13 wherein the superior screw hole, the cranial screw hole, and the caudal screw hole are each designed to accept a locking screw.

15. The bone plate of claim 12 wherein the cranial screw hole is located between about 2 mm and about 4 mm distally from the superior screw hole and the caudal screw hole is located about 4 mm to about 7 mm distally from the superior screw hole.

16. The bone plate of claim 15 wherein the superior screw hole, the cranial screw hole, and the caudal screw hole are each designed to accept a locking screw.

17. The bone plate of claim 12 wherein the cranial screw hole is located between about 5.5 mm and about 9.5 mm distally from the superior screw hole and the caudal screw hole is located about 7.5 mm to about 11.5 mm distally from the superior screw hole.

18. The bone plate of claim 17 wherein the superior screw hole, the cranial screw hole, and the caudal screw hole are each designed to accept a locking screw.

19. A method for performing a tibial plateau leveling osteotomy procedure, comprising:

fixing a first tibial segment having an outer surface to a second tibial segment having an outer surface by securing a bone plate to the outer surface of the first and second segments, wherein the bone plate comprises

a distal portion comprising an elongated shaft having disposed therein a plurality of distal portion screw holes each designed to accept a screw;

a proximal portion having an upper surface and a bone-contacting surface opposite the upper surface, the bone-contacting surface being pre-contoured to be configured and dimensioned to conform to the outer surface of the first tibial bone segment and being partially defined by a cylinder;

a plurality of proximal portion screw holes located in the proximal portion that were machined through the pre-contoured bone-contacting surface, the proximal portion screw holes being designed to accept a locking screw, whereby locking screws anchored through the proximal portion screw holes will have a targeted screw path through the first tibial bone segment.

20. A kit for a tibial plateau leveling osteotomy procedure comprising:

(1) a bone plate dimensioned for securing two tibial bone segments of an animal as part of a tibial leveling osteotomy procedure for an animal, the bone plate comprising;

a distal portion comprising an elongated shaft having disposed therein a plurality of distal portion screw holes each designed to accept a screw;

a proximal portion having an upper surface and a bone-contacting surface opposite the upper surface, the bone-contacting surface being pre-contoured to be configured and dimensioned to conform to a tibial bone segment and being partially defined by a cylinder;

a plurality of proximal portion screw holes located in the proximal portion that were machined through the pre-contoured bone-contacting surface, the proximal portion screw holes being designed to accept a locking screw, whereby locking screws anchored through the proximal portion screw holes will have a targeted screw path through the tibial bone segment; and

(2) locking bone screws adapted to fit within the proximal portion screw holes.