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An interbody spinal implant comprising cortical bone having a width less than one-half the width of the disc space into which it is adapted to be inserted. The implant has a leading end that is asymmetrical from side to side and/or includes a straight portion adapted to be used in side-by-side pairs

An interbody spinal implant comprising cortical bone having a width less than one-half the width of the disc space into which it is adapted to be inserted. The implant has a leading end that is asymmetrical from side to side and/or includes a straight portion adapted to be used in side-by-side pairs.

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What is claim is: 1. An interbody spinal implant made of cortical bone for insertion at least in part across the height of a disc space between adjacent vertebral bodies of a human spine, the vertebral bodies having an anterior aspect and a posterior aspect, said implant comprising: a leading end f

What is claim is: 1. An interbody spinal implant made of cortical bone for insertion at least in part across the height of a disc space between adjacent vertebral bodies of a human spine, the vertebral bodies having an anterior aspect and a posterior aspect, said implant comprising: a leading end for insertion first into the disc space, a trailing end opposite said leading end, said implant having a length along a mid-longitudinal axis of said implant from said leading end to said trailing end; opposed upper and lower portions between said leading and trailing ends adapted to be placed at least in part within and across the height of the disc space to contact and support the adjacent vertebral bodies, said opposed upper and lower portions having a maximum height therebetween, said upper and lower portions being non-arcuate along at least a portion of the length of said implant; an interior side, an exterior side opposite said interior side, and a maximum width therebetween greater than said maximum height, said maximum width of said implant being less than one-half of the width of the adjacent vertebral bodies into which said implant is adapted to be inserted, said interior and exterior sides connecting said upper and lower portions and said leading and trailing ends, said interior side and said exterior side each being at least in part straight along at least a portion of the length of said implant, said leading end being asymmetrical from side to side, said leading end and said trailing end each being at least in part curved from side to side, said interior side adapted to be oriented toward an interior side of another implant when inserted within the disc space; said implant being manufactured from a bone ring obtained from a major long bone of a human having a medullary canal, said implant including at least 40 percent of the bone ring from which it is being formed, said interior side of said implant including at least a portion of the medullary canal so that when said implant is placed side by side another implant having an interior side including at least a portion of a medullary canal a passage is formed adapted to hold bone growth promoting material for permitting for the growth of bone from vertebral body to vertebral body through said passage. 2. The implant of claim 1, wherein said leading end includes a generally straight portion from side to side. 3. The implant of claim 2, wherein said straight portion of said leading end is generally oriented at 90 degrees to the mid-longitudinal axis of said implant. 4. The implant of claim 1, wherein at least a portion of said leading end has a reduced height to facilitate insertion of said implant between the two adjacent vertebral bodies. 5. The implant of claim 1, wherein said trailing end is at least in part straight from side to side. 6. The implant of claim 1, wherein said trailing end is configured in the shape of a half circle from side to side. 7. The implant of claim 1, wherein said trailing end is asymmetrical side to side. 8. The implant of claim 1, wherein the trailing end is adapted to conform from side to side to at least a portion of the peripheral contour of at least one of the anterior and posterior aspects of the vertebral bodies adjacent a disc space into which said implant is inserted. 9. The implant of claim 1, wherein at least one of said interior and exterior sides is at least in part oriented generally parallel to the mid-longitudinal axis of said implant. 10. The implant of claim 1, wherein said interior and exterior sides are at least in part generally parallel one another. 11. The implant of claim 1, wherein at least a portion of said upper and lower surfaces are in an angular relationship to each other from trailing end to leading end for allowing angulation of the adjacent vertebral bodies relative to each other. 12. The implant of claim 1, wherein said upper and lower surfaces include at feast one opening in communication with one another to permit for the growth of bone from vertebral body to vertebral body through said implant. 13. The implant of claim 1, wherein said implant has a maximum length less than and approximating the posterior to anterior depth of the vertebral bodies. 14. The implant of claim 1, further comprising a bone engaging surface formed on the exterior of at least said upper and lower portions for engaging the adjacent vertebral bodies, said bone engaging surface including at least one of a protrusion, a ratchet, a spike, a spline, surface roughenings, and knurling. 15. The implant of claim 1, wherein said implant comprises at least in part of a bone growth promoting material. 16. The implant of claim 15, wherein said bone growth promoting material is selected from one of bone, bone derived products, demineralized bone matrix, mineralizing proteins, ossifying proteins, bone morphogenetic protein, hydroxyapatite, and genes coding for the production of bone. 17. The implant of claim 1, in combination with a bone growth promoting material. 18. The implant of claim 17, wherein said bone growth promoting material is selected from one of bone, bone derived products, demineralized bone matrix, mineralizing proteins, ossifying proteins, bone morphogenetic protein, hydroxyapatite, and genes coding for the production of bone. 19. The implant of claim 1, wherein said implant is treated with a bone growth promoting substance. 20. The implant of claim 1, wherein said implant is at least in part resorbable. 21. The implant of claim 1, in combination with a chemical substance adapted to inhibit scar formation. 22. The implant of claim 1, in combination with an antimicrobial material. 23. The implant of claim 1, wherein at least a portion of said implant is treated to promote bone ingrowth between said implant and said adjacent vertebral bodies. 24. The implant of claim 1, further in combination with at least one spinal fixation implant. 25. A pair of interbody spinal implants made of a bone composite material for insertion at least in part across the height of a disc space between adjacent vertebral bodies of a human spine, the vertebral bodies having an anterior aspect, a posterior aspect, and a depth therebetween, each of said implants comprising: a leading end for insertion first into the disc space, a trailing end opposite said leading end, said implant having a length along a mid-longitudinal axis of said implant from said leading end to said trailing end, said length of said implant being greater than one half the depth of the vertebral bodies adjacent the disc space into which said implant is adapted to be inserted; opposed upper and lower portions between said leading and trailing ends adapted to be placed at least in part within and across the height of the disc space to contact and support the adjacent vertebral bodies, said opposed upper and lower portions having a maximum height therebetween, said upper and lower portions being non-arcuate along at least a portion of the length of said implant; an interior side, an exterior side opposite said interior side, and a maximum width therebetween greater than said maximum height, said maximum width of said implant being less than approximately one-half of the width of the adjacent vertebral bodies into which said implant is adapted to be inserted, said interior and exterior sides connecting said upper and lower portions and said leading and trailing ends, said interior side and said exterior side each being at least in part straight along at least a portion of the length of said implant, said leading end being asymmetrical from side to side, said leading end and said trailing end each being at least in part curved from side to side, said interior side adapted to be oriented toward an interior side of another implant when inserted within the disc space; and said implant being manufactured from a bone composite material, said interior side of said implant including a recess, said interior side of said implant including a recess so that when said implant is placed side by side another implant having an interior side including a recess a passage is formed adapted to hold bone growth promoting material for permitting for the growth of bone from vertebral body to vertebral body through said passage; and the combined width of said pair of said implants being greater than one halt the width of the adjacent vertebral bodies into which said implants are adapted to be inserted. 26. The implant of claim 25, wherein said bone composite material includes at least one of cortical bone fibers, bone filaments, bone particles and bone dust. 27. The implant of claim 25, further comprising a binding material. 28. The implant of claim 27, wherein said binding material is at least one of bioactive and bioresorbable. 29. The implant of claim 25, wherein said leading end includes a generally straight portion from side to side. 30. The implant of claim 29, wherein said straight portion of said leading end is generally oriented at 90 degrees to the mid-longitudinal axis of said implant. 31. The implant of claim 25, wherein at least a portion of said leading end has a reduced height to facilitate insertion of said implant between the two adjacent vertebral bodies. 32. The implant of claim 25, wherein said trailing end is at least in part straight from side to side. 33. The implant of claim 25, wherein said trailing end is configured in the shape of a half circle from side to side. 34. The implant of claim 25, wherein said trailing end is asymmetrical side to side. 35. The implant of claim 25, wherein the trailing end is adapted to conform from side to side to at least a portion of the peripheral contour of at least one of the anterior and posterior aspects of the vertebral bodies adjacent a disc space into which said implant is inserted. 36. The implant of claim 25, wherein at least one of said interior and exterior sides is at least in part oriented generally parallel to the mid-longitudinal axis of said implant. 37. The implant of claim 25, wherein said interior and exterior sides are at least in part generally parallel one another. 38. The implant of claim 25, wherein at least a portion of said upper and lower surfaces are in an angular relationship to each other from trailing end to leading end for allowing angulation of the adjacent vertebral bodies relative to each other. 39. The implant of claim 25, wherein said upper and lower surfaces include at least one opening in communication with one another to permit for the growth of bone from vertebral body to vertebral body through said implant. 40. The implant of claim 25, wherein said implant has a maximum length less than and approximating the posterior to anterior depth of the vertebral bodies. 41. The implant of claim 25, further comprising a bone engaging surface formed on the exterior of at feast said upper and lower portions for engaging the adjacent vertebral bodies, said bone engaging surface including at least one of a protrusion, a ratchet, a spike, a spline, surface roughenings, and knurling. 42. The implant of claim 25, wherein said implant comprises at least in part of a bone growth promoting material. 43. The implant of claim 42, wherein said bone growth promoting material is selected from one of bone, bone derived products, demineralized bone matrix, mineralizing proteins, ossifying proteins, bone morphogenetic protein, hydroxyapatite, and genes coding for the production of bone. 44. The implant of claim 25, in combination with a bone growth promoting material. 45. The implant of claim 44, wherein said bone growth promoting material is selected from one of bone, bone derived products, demineralized bone matrix, mineralizing proteins, ossifying proteins, bone morphogenetic protein, hydroxyapatite, and genes coding for the production of bone. 46. The implant of claim 25, wherein said implant is treated with a bone growth promoting substance. 47. The implant of claim 25, wherein said implant is at least in part resorbable. 48. The implant of claim 25, in combination with a chemical substance adapted to inhibit scar formation. 49. The implant of claim 25, in combination with an antimicrobial material. 50. The implant of claim 25, wherein at least a portion of said implant is treated to promote bone ingrowth between said implant and said adjacent vertebral bodies. 51. The implant of claim 25, further in combination with at least one spinal fixation implant. 52. A pair of interbody spinal implants made of cortical bane for insertion at least in part into the same implantation space formed across the height of a disc space between adjacent vertebral bodies of a human spine, the vertebral bodies having an anterior aspect and a posterior aspect and a depth therebetween, each of said implants comprising: a leading end for insertion first into the disc space, a trailing end opposite said leading end, and a length from said leading end to said trailing end; opposed upper and lower portions between said leading and trailing ends adapted to be placed at least in part within and across the height of the disc space to contact and support the adjacent vertebral bodies, said upper and lower portions defining a height of each of said implants, said upper and lower portions being non-arcuate along at least a portion of the length of each of said implants; and opposite sides between said upper portion and said lower portion, and between said leading and trailing ends, said opposite sides defining a width of each of said implants, said leading end being configured in the shape of a portion of a circle from one of said opposite sides to another one of said opposite sides, the circle having a radius greater than the width of each of said implants; each of said implants being manufactured from a bone ring obtained from a major long bone of a human being having a medullary canal, one of said opposite sides of each of said implants including at least a portion of the medullary canal so that when said pair of implants are placed side-by-side in the same disc space a passage is formed adapted to hold bone growth promoting material for permitting for the growth of bone from vertebral body to vertebral body through each of said implants; said leading ends of said implants forming part of the same circle when inserted into the same implantation space. 53. The pair of implants of claim 52, wherein each of said implants has a maximum width between said opposite sides that is less than one-half of the width of the adjacent vertebral bodies into which each of said implants is adapted to be inserted. 54. The pair of implants of claim 52, wherein at least a portion of said leading end of each of said implants has a reduced height to facilitate insertion of each of said implants between the two adjacent vertebral bodies. 55. The pair of implants of claim 52, wherein said trailing end of at least one of said implants has a radius of curvature of a second circle from side to side. 56. The pair of implants of claim 55, wherein the radius of curvature said trailing end is greater than the radius of curvature of the leading end of said at least one of said implants. 57. The pair of implants of claim 52, wherein each of said implants has a mid-longitudinal axis along the length, at least one of said opposite sides of at least one of said implants being at least in part oriented generally parallel to the mid-longitudinal axis of said at least one of said implants. 58. The pair of implants of claim 52, wherein said opposite sides of at least one of said implants are at least in part generally parallel one another. 59. The pair of implants of claim 52, wherein at least a portion of said upper and lower portions of at least one of said implants are in an angular relationship to each other from trailing end to leading end for allowing angulation of the adjacent vertebral bodies relative to each other. 60. The pair of implants of claim 52, wherein at least one of said implants has a maximum length less than and approximating the posterior to anterior depth of the vertebral bodies. 61. The pair of implants of claim 52, wherein at least one of said implants further comprises a bone engaging surface formed on the exterior of at least said upper and lower portions for engaging the adjacent vertebral bodies, said bone engaging surface including at least one of a protrusion, a ratchet, surface roughenings, and knurling. 62. The pair of implants of claim 52, in combination with a bone growth promoting material. 63. The pair of implants of claim 62, wherein said bane growth promoting material is selected from one of bone, bone derived products, demineralized bone matrix, mineralizing proteins, ossifying proteins, bone morphogenetic protein, hydroxyapatite, and genes coding for the production of bone. 64. The pair of implants of claim 52, wherein at least one of said implants is treated with a bone growth promoting substance. 65. The pair of implants of claim 52, wherein at least one of said implants is at least in part resorbable. 66. The pair of implants of claim 52, in combination with a chemical substance adapted to inhibit scar formation. 67. The pair of implants of claim 52, in combination with an antimicrobial material. 68. The pair of implants of claim 52, wherein at least a portion of at least one of said implants is treated to promote bone ingrowth between said at least one of said implants and said adjacent vertebral bodies. 69. The pair of implants of claim 52, wherein said first and second implants are mirror images of one another. 70. An interbody spinal implant made of cortical bone for insertion at least in part into an implantation space formed across the height of a disc space between adjacent vertebral bodies of a human spine, the vertebral bodies having an anterior aspect and a posterior aspect and a depth therebetween, said implant comprising: a leading end for insertion first into the disc space and a trailing end opposite said leading end, said implant having a length from said leading end to said trailing end; opposed upper and lower portions between said leading and trailing ends adapted to be placed at least in part within and across the height of the disc space to contact and support the adjacent vertebral bodies, said upper and lower portions defining a height of said implant, said upper and lower portions being non-arcuate along at least a portion of the length of said implant; and opposite sides between said upper portion and said lower portion, and between said leading and trailing ends, said opposite sides defining a width of said implant, each of said sides being at least in part straight along at least a portion of the length of said implant, said leading end being configured in the shape of a portion of a circle from one of said opposite sides to another one of said opposite sides, the circle having a radius greater than the width of said implant, the width of said implant being less than one-half the width of the adjacent vertebral bodies into which said implant is adapted to be inserted; said implant being manufactured from a bone ring obtained from a major long bone of a human being having a medullary canal, one of said opposite sides of each of said implants including at least a portion of the medullary canal so that when said pair of implants are placed side-by-side in the same disc space a passage is formed adapted to hold bone growth promoting material for permitting for the growth of bone from vertebral body to vertebral body through said implant. 71. The implant of claim 70, wherein said implant is adapted to be inserted side by side a second implant into the disc space between the adjacent vertebral bodies, said second implant having a leading end configured in the shape of a portion of a circle from side to side, the circle having a radius greater than the width of said second implant. 72. The implant of claim 70, wherein at least a portion of said leading end has a reduced height to facilitate insertion of said implant between the two adjacent vertebral bodies. 73. The implant of claim 70, wherein said trailing end has a radius of curvature of a second circle from side to side. 74. The implant of claim 73, wherein the radius of curvature said trailing end is greater than the radius of curvature of the leading end of said implant. 75. The implant of claim 70, wherein said implant has a mid-longitudinal axis along the length, at least one of said opposite sides being at least in part oriented generally parallel to the mid-longitudinal axis of said implant. 76. The implant of claim 70, wherein said opposite sides are at least in part generally parallel one another. 77. The implant of claim 70, wherein at least a portion of said upper and lower portions are in an angular relationship to each other from trailing end to leading end for allowing angulation of the adjacent vertebral bodies relative to each other. 78. The implant of claim 70, wherein said implant has a maximum length less than and approximating the posterior to anterior depth of the vertebral bodies. 79. The implant of claim 70, further comprising a bone engaging surface formed on the exterior of at least said upper and lower portions for engaging the adjacent vertebral bodies, said bone engaging surface including at least one of a protrusion, a ratchet, surface roughenings, and knurling. 80. The implant of claim 70, in combination with a bone growth promoting material. 81. The implant of claim 80, wherein said bone growth promoting material is selected from one of bone, bone derived products, demineralized bone matrix, mineralizing proteins, ossifying proteins, bone morphogenetic protein, hydroxyapatite, and genes coding for the production of bone. 82. The implant of claim 70, wherein said implant is treated with a bone growth promoting substance. 83. The implant of claim 70, wherein said implant is at least in part resorbable. 84. The implant of claim 70, in combination with a chemical substance adapted to inhibit scar formation. 85. The implant of claim 70, in combination with an antimicrobial material. 86. The implant of claim 70, wherein at least a portion of said implant is treated to promote bone ingrowth between said implant and said adjacent vertebral bodies.