Adjustable and fixed assembled bone-tendon-bone graft
View Patent ↗The present invention has multiple aspects relating to a bone-tendon-bone graft and components thereof. Embodiments of the present invention comprise an intermediate bone block that is used to adjustably secure soft tissue (e.g., tendon) in a patient. The present invention further relates to an assembled bone-tendon-bone graft suitable for implantation in humans comprising the intermediate bone block and a length of soft tissue. In a preferred embodiment, a bone-tendon-bone graft comprises a length of soft tissue (e.g., tendon) extending from a first assembled bone block to a second bone block and then doubles back to said first assembled bone block. Depending upon the embodiment, the second bone block fixedly or slideably attaches to the length of soft tissue and facilitates it doubling back to the first assembled bone block.
1. An adjustable bone-tendon-bone implant comprising:
a length of soft tissue having a first end and a second end,
a first bone component, and
a second bone component
wherein said second bone component slideably attaches to said length of soft tissue and wherein said first bone component comprises a first intermediate bone block and a second intermediate bone block, said first intermediate bone block and said second intermediate bone block sandwiching said first end of said length of soft tissue therebetween; and
wherein said first intermediate bone block comprises a first tissue engaging surface that contacts one side of said soft tissue and said second intermediate bone block comprises a second tissue engaging surface that contacts an opposing side of said soft tissue; and
wherein said first tissue engaging surface of said first intermediate bone block comprises at least one compression surface and from one to ten channels; wherein said one to ten channels have an undercut cross-sectional profile and are laid out across said tissue engaging surface in a nested configuration along a direction of pull of said soft tissue; and
further wherein said second bone component comprises at least one portal through said second bone component from a top side to a bottom side and wherein said length of soft tissue goes through said portal of said second bone component
wherein said first bone component, said second bone component and said length of soft tissue comprise allograft tissue, autograft tissue, xenograft tissue, an engineered construct of natural or synthetic origin or a combination thereof.
2. The implant of claim 1 , wherein said second bone component facilitates said length of soft tissue doubling back on itself.
3. The implant of claim 2 , wherein said first end of said length of soft tissue is sandwiched in between said first intermediate bone block and said second intermediate bone block and said length of soft tissue doubles back through said second bone component, with said second end of said length of soft tissue ending underneath said first intermediate bone block.
4. The implant of claim 3 , wherein said length of soft tissue is compressed when an interference screw is used to secure the first bone component.
5. The implant of claim 1 , wherein said soft tissue contacts the second bone component in at least one place along the length of said soft tissue.
6. The implant of claim 1 , wherein said first and/or second bone components comprise cortical bone, cancellous bone or both.
7. The implant of claim 1 , wherein said length of soft tissue is selected from the group consisting of one to ten tendons, one to ten ligaments, an isolated segment or segments of pericardium, dermis, fascia, dura, skin, submucosal tissue, cartilage, or a combination thereof.