Standalone anterior lumber interbody spacer

1. A modular interbody spacer for placement between adjacent vertebrae comprising:

a spacer body selected from a group of interchangeable spacer bodies having upper and lower vertebrae engagement surfaces and a proximal end having a vertical slot from the upper surface with a bore or hole;

a spring loaded lock tab and a spring slidable within the bore or hole; and

a fixation plate selected from a group of interchangeable fixation plates having upper and lower bone vertebrae surfaces and a distal end coupled to the proximal end of the spacer body, the fixation plate incudes:

one or more fastener holes on a proximal end sized to receive a bone engagement fastener to attach the fixation plate to:

the vertebra above or below the spacer body, or

both the vertebra above and below the spacer body; and

a protrusion on the distal end configured to slidably insert in the vertical slot in a vertical direction,

a first portion of the protrusion is configured to compress the spring loaded lock tab during insertion, and

a second portion of the protrusion is configured to lock the spring loaded lock tab when the fixation plate and spacer body are completely joined.

2. The interbody spacer of claim 1 , wherein the first portion of the protrusion includes an inclined or ramped portion configured to engage and move the spring loaded lock tab and spring inward in the bore or hole.

3. The interbody spacer of claim 1 , wherein the second portion of the protrusion includes a tab engagement recess configured to engage and allow the spring loaded lock tab and spring to move outward from the bore and lock the spring loaded lock tab.

4. The interbody spacer of claim 1 , wherein the spring loaded lock tab includes a slotted portion and a retaining pin positioned in the slotted portion to retain the spring loaded lock tab and limit the inward and outward travel.

5. The interbody spacer of claim 1 , where the proximal end of the fixation plate includes a hole configured to receive a disassembly tool to disengage the spring loaded lock tab.

6. A modular interbody spacer for placement between adjacent vertebrae comprising:

a spacer body selected from a group of interchangeable spacer bodies having upper and lower vertebrae engagement surfaces and a proximal end having a vertical slot from the upper surface with a bore or hole;

a spring loaded lock tab and a spring slidable within the bore or hole; and

a fixation plate selected from a group of interchangeable fixation plates having upper and lower bone vertebrae surfaces and a distal end coupled to the proximal end of the spacer body, the fixation plate incudes;

one or more fastener holes on a proximal end sized to receive a bone engagement fastener to attach the fixation plate to:

the vertebra above or below the spacer body, or

both the vertebra above and below the spacer body; and

a protrusion the distal end configured to slidably insert in the vertical slot in a vertical direction,

a first portion of the protrusion includes an inclined or ramped portion configured to compress the spring loaded lock tab during insertion, and

a second portion of the protrusion includes a tab engagement recess configured to lock the spring loaded lock tab when the fixation plate and spacer body are completely joined.

7. The interbody spacer of claim 6 , wherein the inclined or ramped portion is configured to engage and move the spring loaded lock tab and spring inward in the bore or hole.

8. The interbody spacer of claim 6 , wherein the tab engagement recess is configured to allow the spring loaded lock tab and spring to move outward from the bore and lock the spring loaded lock tab.

9. The interbody spacer of claim 6 , wherein the spring loaded lock tab includes a slotted portion and a retaining pin positioned in the slotted portion to retain the spring loaded lock tab and limit the inward and outward travel.

10. The interbody spacer of claim 6 , where the proximal end of the fixation plate includes a hole configured to receive a disassembly tool to disengage the spring loaded lock tab.

11. A modular interbody spacer for placement between adjacent vertebrae comprising:

a spacer body selected from a group of interchangeable spacer bodies having upper and lower vertebrae engagement surfaces and a proximal end having a vertical slot from the upper surface with a bore or hole;

a spring loaded lock tab and a spring slidable within the slot, bore or hole; and

a fixation plate selected from a group of interchangeable fixation plates having upper and lower vertebrae engagement surfaces and a distal end coupled to the proximal end of the spacer body, the fixation plate incudes:

one or more fastener holes on a proximal end sized to receive a bone engagement fastener to attach the fixation plate to:

the vertebra above or below the spacer body, or

both the vertebra above and below the spacer body; and

a protrusion on the distal end configured to slidably insert in the vertical slot in a vertical direction,

a first portion of the protrusion includes an inclined or ramped portion configured to engage and move the spring loaded lock tab and spring inward in the bore or hole, and

a second portion of the protrusion includes a tab engagement recess configured to allow the spring loaded lock tab and spring to move outward from the bore and lock the spring loaded lock tab when the fixation plate and spacer body are completely joined.

12. The interbody spacer of claim 11 , wherein the spring loaded lock tab includes a slotted portion and a retaining pin positioned in the slotted portion to retain the spring loaded lock tab and limit the inward and outward travel.

13. The interbody spacer of claim 11 , wherein the proximal end of the fixation plate includes a hole configured to receive a disassembly tool to disengage the spring loaded lock tab.

14. The interbody spacer of claim 11 , wherein the proximal end of the fixation plate includes bone screw locking features.