Orthopedic bone fixation systems and methods
The orthopedic systems are patient-specific and provided with two types of features for positioning and/or fixing the plate to the bone or bone fragments. A method for generating bone plates comprises: generating a model of the bone defect or envisaged osteotomy based on one or more images of the bone and the surgical plan; designing based on said model a model corresponding to the envisioned repair of said bone defect/envisaged result of the osteotomy; generating a bone plate based on the information above, comprising: one or more patient-specific features corresponding to the surface of a bone fragment in the area close to the defect; and one or more fixation features whose position and/or orientation is such that the fixation elements will enter the bone in areas suitable for fixing the bone plate to each bone fragment.
1. Method for designing a model of a bone plate comprising the steps of:
generating a 2D or 3D model of a bone defect or envisaged osteotomy based on one or more images of a bone and a surgical plan;
designing, based on said 2D or 3D model, a model of an envisioned repair of said bone defect or result of the envisaged osteotomy;
designing a model of a bone plate with a rigid structure or supporting element based on the model of the envisioned repair of said bone defect or result of the envisaged osteotomy, the model of the bone plate comprising:
a) one or more patient-specific features comprising at least a portion of a surface of the rigid structure or supporting element intended for placement on the bone matching a surface of a bone fragment in an area close to the bone defect or envisaged osteotomy,
b) one or more fixation features of which the position and/or orientation is such that fixation elements will enter the bone in areas suitable for fixing the bone plate to said bone fragment, and
c) one or more positioning elements extending from the surface of the rigid structure or supporting element, wherein the one or more positioning elements are pins or pegs, and wherein said one or more positioning elements are not detachable from the bone plate including the one or more patient-specific features; and
designing a model of a guide for drilling holes in the bone in positions matching positions of the one or more positioning elements.
2. The method of claim 1 , wherein the one or more positioning elements are non-threaded structures.
3. The method of claim 1 , wherein said one or more positioning elements are provided on said bone plate so as not to be parallel to each other.
4. The method of claim 1 , wherein said one or more patient-specific features comprise at least two patient-specific features, each matching a surface on one of two bone fragments which are to be fixed together.
5. The method of claim 1 , wherein said rigid structure or supporting element has a varying thickness.
6. The method of claim 5 , wherein the thickness of the rigid structure or supporting element is locally increased around an osteotomy or fracture plane.
7. The method of claim 1 , wherein the one or more positioning elements comprise at least two positioning elements.
8. The method of claim 1 , wherein the bone plate is provided in two or more separate parts, each comprising at least one of the one or more fixation features, which can be combined and attached to each other to form a one-piece bone plate after placement on bone fragments and positioning of the bone fragments in a desired position.
9. The method of claim 1 , wherein a position and/or orientation of the one or more positioning elements is such that the one or more positioning elements will enter the bone.