Head over head connector assembly

1. A connector assembly, comprising:

a bone screw comprising a head;

a first holder assembly configured to receive the head of the bone screw from a bottom of the first holder assembly;

an extension set screw comprising a head and a threaded portion, the threaded portion configured to be received from a top of the first holder assembly;

a second holder assembly configured to receive the head of the extension set screw, wherein the second holder assembly includes a holder and a locking sleeve received within the holder, the locking sleeve configured to couple the second holder assembly to the extension set screw; and

an end fastener configured to be received by the second holder assembly.

2. The connector assembly of claim 1 , wherein the first holder assembly includes a first holder and a first locking sleeve received within the first holder, the first locking sleeve configured to resiliently receive the head of the bone screw from the bottom of the first holder assembly.

3. The connector assembly of claim 2 , wherein the bone screw and the first holder assembly are configured to enable a user to secure the head of the bone screw within the first holder assembly while the bone screw is secured to bone.

4. The connector assembly of claim 1 , wherein the head of the bone screw enables polyaxial movement of the head of the bone screw relative to the first holder assembly.

5. The connector assembly of claim 1 , wherein the head of the extension set screw enables polyaxial movement of the head of the extension set screw relative to the second holder assembly.

6. The connector assembly of claim 1 , wherein the first holder assembly and the second holder assembly are configured to secure first and second spinal rods in a generally parallel fashion.

7. The connector assembly of claim 1 , wherein the second holder assembly is configured to receive the head of the extension set screw after the threaded portion of the extension set screw is received by the first holder assembly.

8. The connector assembly of claim 1 , wherein the head of the bone screw comprises a first socket of a first shape, and the head of the extension set screw comprises a second socket of the first shape.

9. A connector assembly, comprising:

a bone screw comprising a head;

a first holder assembly configured to receive the head of the bone screw;

an extension set screw comprising a head and a threaded portion, the threaded portion configured to be received by the first holder assembly;

a second holder assembly configured to receive the head of the extension set screw, wherein the second holder assembly includes a holder and a locking sleeve received within the holder, the locking sleeve configured to couple the second holder assembly to the extension set screw;

a set screw configured to be received by the second holder assembly;

wherein the first holder assembly and the second holder assembly are configured to secure first and second spinal rods in a generally parallel fashion.

10. The connector assembly of claim 9 , wherein the first holder assembly is configured to receive the head of the bone screw from a bottom of the first holder assembly.

11. The connector assembly of claim 10 , wherein the first holder assembly includes a holder and a locking sleeve received within the holder, the locking sleeve configured to resiliently receive the head of the bone screw from the bottom of the first holder assembly.

12. The connector assembly of claim 10 , wherein the bone screw and the first holder assembly are configured to enable a user to secure the head of the bone screw within the first holder assembly while the bone screw is secured to bone.

13. The connector assembly of claim 9 , wherein the head of the bone screw enables polyaxial movement of the head of the bone screw relative to the first holder assembly.

14. The connector assembly of claim 9 , wherein the head of the extension set screw enables polyaxial movement of the head of the extension set screw relative to the second holder assembly.

15. The connector assembly of claim 9 , wherein the second holder assembly is configured to receive the head of the extension set screw after the threaded portion of the extension set screw is received by the first holder assembly.

16. The connector assembly of claim 9 , wherein the locking sleeve further comprises a notch configured to received a spinal rod.

17. A method of assembling a connector assembly comprising:

securing a bone screw to bone, the bone screw including a head and a threaded portion, the threaded portion configured to engage the bone;

coupling a first holder assembly to the hone screw, wherein the head of the bone screw is received within the first holder assembly, wherein the first holder assembly includes a holder and a locking sleeve received within the holder, the locking sleeve configured to secure the bone screw in a first position relative to the first holder assembly;

positioning a first spinal rod within the first holder assembly;

coupling an extension set screw to the first holder assembly to secure the first spinal rod in a desired position, the extension set screw comprising a head and a threaded portion, the threaded portion configured to threadingly engage the first holder assembly;

coupling a second holder assembly to the extension set screw, wherein the head of the extension set screw is received within the second holder assembly, wherein the second holder assembly includes a second holder and a second locking sleeve received within the second holder, the second locking sleeve configured to secure the extension set screw in a second position relative to the second holder assembly;

positioning a second spinal rod within the second holder assembly; and

coupling a set screw to the second holder assembly to secure the second spinal rod in a desired position.

18. The method of claim 17 , further comprising aligning the second spinal rod in a generally parallel and aligned fashion with the first spinal rod.

19. The method of claim 17 , wherein the first holder assembly is coupled to the bone screw after the bone screw is secured to the bone.

20. The method of claim 17 , wherein the second holder assembly is coupled to the extension set screw after the extension set screw is coupled to the first holder assembly.