Artificial si joint

Abstract

An artificial SI-Joint includes a sacrum component and an ilium component. The sacrum component may include a ridge, foundation, perimeter surface and a fitting member. The ilium component may include a polybearing, edge, foundation, perimeter surface, and a ridge or sockets. The fitting member of the sacrum component may engage the polybearing of the ilium component to restore normal movement of the SI-Joint. The artificial SI-Joint may be implanted as a single unit or as separate pieces that are coupled together.

What is claimed is: 
     
         1 . An artificial SI-Joint system, the system comprising:
 a first component having a foundation comprising a first side and a second side, a first ridge extending from the first side, the second side having a concave and elongate articulating surface with a first length and a first curvature along the first length; and   a second component having a base comprising a third side and a fourth side opposite the third side, the third side having a convex and elongate articulating surface adapted for engaging the concave articulating surface of the first component to allow movement of the second component relative to the first component, wherein the convex articulating surface has a second length and a second curvature along the second length, wherein the first curvature matches the second curvature.   
     
     
         2 . The system of  claim 1 , wherein the first component is configured to be coupled to a sacrum bone of a patient and the second component is configured to be coupled to an ilium bone of the patient. 
     
     
         3 . The system of  claim 1 , wherein the second component comprises a second ridge extending from the fourth side of the second component. 
     
     
         4 . The system of  claim 1 , wherein the second component comprises a socket on the fourth side of the second component, the socket adapted to receive a screw. 
     
     
         5 . The system of  claim 1 , wherein the convex articulating surface and the concave articulating surface are adapted to allow about 2 degrees to about 4 degrees of movement relative to each other when engaged. 
     
     
         6 . The system of  claim 1 , wherein the first curvature and the second curvature both have a radius of curvature between about 10 mm to about 70 mm. 
     
     
         7 . The system of  claim 1 , wherein the first side of the first component and the fourth side of the second component are rough, while the concave articulating surface and the convex articulating surface are smooth. 
     
     
         8 . The system of  claim 1 , wherein the first side of the first component and the fourth side of the second component are coated with a biologic aid. 
     
     
         9 . An artificial SI-Joint system, the system comprising:
 a first component having a foundation comprising a first side and a second side, a first ridge extending from the first side, the second side having a convex and elongate articulating surface with a first length and a first curvature along the first length; and   a second component having a base comprising a third side and a fourth side opposite the third side, the third side having a concave and elongate articulating surface adapted for engaging the convex articulating surface of the first component to allow movement of the second component relative to the first component, wherein the concave articulating surface has a second length and a second curvature along the second length, wherein the first curvature matches the second curvature.   
     
     
         10 . The system of  claim 9 , wherein the first component is configured to be coupled to a sacrum bone of a patient and the second component is configured to be coupled to an ilium bone of the patient. 
     
     
         11 . The system of  claim 9 , wherein the second component comprises a second ridge extending from the fourth side of the second component. 
     
     
         12 . The system of  claim 9 , wherein the second component comprises a socket on the fourth side of the second component, the socket adapted to receive a screw. 
     
     
         13 . The system of  claim 9 , wherein the convex articulating surface and the concave articulating surface are adapted to allow about 2 degrees to about 4 degrees of movement relative to each other when engaged. 
     
     
         14 . The system of  claim 9 , wherein the first curvature and the second curvature both have a radius of curvature between about 10 mm to about 70 mm. 
     
     
         15 . The system of  claim 9 , wherein the first side of the first component and the fourth side of the second component are rough, while the concave articulating surface and the convex articulating surface are smooth. 
     
     
         16 . The system of  claim 9 , wherein the first side of the first component and the fourth side of the second component are coated with a biologic aid. 
     
     
         17 . A method of creating an artificial SI-Joint in a patient, the method comprising:
 creating a first curved insertion path in the sacrum and a second curved insertion path in the ilium along articular bone within the patient's SI-Joint, wherein the first curved insertion path and the second curved insertion path have matching curvatures with a common axis of rotation;   inserting a sacrum component into the first insertion path; and   inserting an ilium component into the second insertion path.   
     
     
         18 . The method of  claim 17 , wherein the step of inserting the sacrum component comprises rotating the sacrum component into the first insertion path about the common axis of rotation, and wherein the step of inserting the ilium component comprises rotating the ilium component into the second insertion path about the common axis of rotation. 
     
     
         19 . The method of  claim 17 , further comprising aligning a concave articulating surface of the sacrum component with a convex articulating surface of the ilium component. 
     
     
         20 . The method of  claim 17 , further comprising aligning a convex articulating surface of the sacrum component with a concave articulating surface of the ilium component.