Intervertebral spacers

A hollow spinal spacer for

• engagement within an intervertebral space between adjacent vertebrae, comprising:
• an anterior wall;
• a posterior wall;
• two lateral walls integrally connected between said anterior and posterior walls to define a monolithic, single-piece spacer body having a hollow inner chamber defined by said walls;
• said spacer body sized and shaped to substantially fill the intervertebral space between the adjacent vertebrae such that a single spacer body is sufficient to preserve a height of the intervertebral space;
• wherein said spacer body defines an overall spacer length between said anterior wall and said posterior wall;
• said spacer body defining a superior vertebral engaging face and an opposite inferior vertebral engaging face, said superior vertebral engaging face defined by a thickness of said walls extending about and defining a first superior opening in communication with said chamber, said inferior vertebral engaging face defined by a thickness of said walls extending about and defining a second inferior opening in communication with said chamber;
• wherein said lateral walls each have a substantially flat lateral surface extending continuously from said anterior wall to said posterior wall;
• wherein at least one of said anterior wall and said posterior wall defines an outer surface curvature extending between said lateral walls;
• and
• wherein said outer surface curvature comprises a concave curvature extending between said lateral walls;
• wherein said concave curvature is defined by one of said superior vertebral engaging face and said inferior vertebral engaging face and extends along the overall spacer length;
• and wherein an opposite one of said superior vertebral engaging face and said inferior vertebral engaging face defines a convex outer surface curvature extending laterally between said lateral walls and extending along the overall spacer length.

A hollow spinal spacer for engagement within an intervertebral space between adjacent vertebrae, comprising:

• an anterior wall;
• a posterior wall;
• two lateral walls integrally connected between said anterior and posterior walls to define a monolithic, single-piece spacer body having a hollow inner chamber defined by said walls;
• wherein said lateral walls each have a substantially flat lateral surface extending continuously from said anterior wall to said posterior wall;
• wherein said spacer body defines an overall spacer length between said anterior wall and said posterior wall;
• said spacer body sized and shaped to substantially fill the intervertebral space between the adjacent vertebrae such that a single spacer body is sufficient to preserve a height of the intervertebral space;
• and
• said spacer body defining a superior vertebral engaging face and an opposite inferior vertebral engaging face, said superior vertebral engaging face defined by a thickness of said walls extending about and defining a first superior opening in communication with said chamber, said inferior vertebral engaging face defined by a thickness of said walls extending about and defining a second inferior opening in communication with said chamber;
• wherein at least one of said superior vertebral engaging face and said inferior vertebral engaging face defines at least one surface curvature that substantially conforms to a contour of an adjacent vertebral endplate;
• wherein said surface curvature comprises a concave curvature that extends along the overall spacer length;
• and
• wherein an opposite one of said superior vertebral engaging face and said inferior vertebral engaging face defines a convex outer surface curvature extending laterally between said lateral walls and extending along the overall spacer length.