Method and apparatus for reducing human vertebral body subsidence using variable surface area interbody cages correlated to localized bone density measurements

A spinal implant for insertion between the endplates of adjacent vertebrae comprising:

• a circumscribing wall member defining an interior hollow portion;
• said wall member comprising:
• a superior surface defining a superior opening,
• an inferior surface defining an inferior opening, and
• a first arching portion extending inwardly from the wall member and upwardly towards the superior surface decreasing the size of the superior opening,
• wherein the amount of arching inwardly by the first arching portion defining the superior opening being determined by an acceptable Hounsfield Parameter value determined from a radiodensity scan of the endplates of the vertebrae contacting the superior surface.

A spinal implant for insertion between the endplates of adjacent vertebrae comprising:

• a circumscribing wall member defining an interior hollow portion;
• said wall member includes porous structure and further comprises:
• a superior surface defining a superior opening, and
• an inferior surface defining an inferior opening;
• a first arching portion extending inwardly from the wall member and upwardly towards the superior surface decreasing the size of the superior opening wherein the amount of arching inwardly by the first arching portion defining the superior opening being determined by an acceptable Hounsfield Parameter value determined from a radiodensity scan of the endplates of the vertebrae contacting the superior surface;
• and
• a second arching portion extending inwardly from the wall member and downwardly towards the inferior surface decreasing the size of the inferior opening wherein the amount of arching inwardly by the second arching portion defining the inferior opening being determined by an acceptable Hounsfield Parameter value determined from a radiodensity scan of the endplates of the vertebrae contacting the inferior surface.