Conformation based bone model generation and associated surgical techniques

1 . A method for generating a bone model for a patient bone, in which each step is computer-implemented, comprising:

storing a conforming bone template model;

accepting a nonconformity of the patient bone, wherein:

the nonconformity is accepted as a set of numbers; and

the set of numbers includes a proximal distal medial tibial cortex flare angle and a proximal distal medial tibial cortex diaphysis;

generating a nonconforming bone model using the nonconformity of the patient bone and the conforming bone template model;

wherein the nonconformity is used to set a constraint of the conforming bone template model to a value and the nonconforming bone model has the value for the constraint.

2 . The method of claim 1 , further comprising:

accepting a selection of a bone type; and

displaying, prior to accepting the nonconformity and after accepting the selection of the bone type, the conforming bone template model of the bone type.

3 . The method of claim 1 , further comprising:

accepting a scaling factor; and

scaling the conforming bone template model by the scaling factor to produce a scaled conforming bone template model.

4 . The method of claim 3 , further comprising:

displaying, prior to accepting the nonconformity and after accepting the scaling factor, the scaled conforming bone template model.

5 . The method of claim 3 , wherein:

the scaling factor is one of a frontal scaling factor and a sagittal scaling factor.

6 . The method of claim 3 , wherein:

the scaling factor is a desired length of the patient bone.

7 . The method of claim 1 , further comprising:

displaying the nonconforming bone model; and

iteratively: (i) accepting a revised measured nonconformity of the patient bone; (ii) generating a revised nonconforming bone model using the revised measured nonconformity; and (iii) displaying the revised nonconforming bone model.

8 . The method of claim 1 , wherein:

the nonconformity is accepted as a set of numbers that are one of: (i) entered into input fields; (ii) selected on a selection interface.

9 . The method of claim 1 , wherein:

the nonconformity is accepted as a set of numbers; and

the set of numbers includes a distance of the nonconformity from a joint of the patient bone.

10 . The method of claim 1 , wherein:

the nonconformity is accepted as a plane of the nonconformity and a magnitude of the nonconformity.

11 . The method of claim 1 , wherein:

the constraint of the conforming bone template model is a distance from a joint to a plane of the nonconformity;

the nonconformity is used to set a second constraint of the conforming bone template model to a second value and the nonconforming bone model has the second value for the second constraint;

the nonconformity is used to set a third constraint of the conforming bone template model to a third value and the nonconforming bone model has the third value for the third constraint;

the second constraint of the conforming bone template model is a magnitude of the nonconformity expressed as an angle in the sagittal plane; and

the third constraint of the conforming bone template model is a magnitude of the nonconformity expressed as an angle in the frontal plane.

12 . The method of claim 1 , wherein accepting the nonconformity of the patient bone further comprises:

accepting a bisection width; and

accepting a deformity angle.

13 . The method of claim 12 , wherein generating the nonconforming bone model further comprises:

separating a first modeled bone segment from a second modeled bone segment by the bisection width;

rotating the first modeled bone segment by the deformity angle after separating the first modeled bone segment from the second modeled bone segment; and

lofting the first modeled bone segment to the second modeled bone segment after rotating the first modeled bone segment.

14 . The method of claim 12 , further comprising:

separating a first modeled bone segment from a second modeled bone segment by the bisection width;

accepting a scaling factor for the first modeled bone segment; and

scaling the first modeled bone segment independently of the second modeled bone segment using the scaling factor.

15 . The method of claim 1 , wherein:

the nonconformity is a nonconforming surface of the patient bone.

16 . A method for generating a cut guide for an osteotomy on a patient bone, in which each step is computer-implemented, comprising:

storing a conforming bone template model;

accepting a measured nonconformity of the patient bone; wherein accepting the measured nonconformity of the patient bone further comprises: (i) accepting a bisection width; (ii) accepting a deformity location; and (iii) accepting a deformity angle;

generating a nonconforming bone model using the measured nonconformity and the conforming bone template model, wherein the nonconforming bone model includes cut lines automatically generated based on the measured nonconformity; and

generating a model of the cut guide using the nonconforming bone model and the cut lines.

17 . The method of claim 16 , further comprising:

displaying the model of the cut guide on the nonconforming bone model; and

displaying a post operative bone model of the patient bone based on the model of the cut guide and the nonconforming bone model.

18 . A method for generating a bone model for a patient bone, in which each step is computer-implemented, comprising:

storing a conforming bone template model;

accepting a scaling factor;

scaling the conforming bone template model by the scaling factor to produce a scaled conforming bone template model;

displaying the scaled conforming bone template model;

accepting a nonconformity of the patient bone; and

generating a nonconforming bone model using the nonconformity of the patient bone and the conforming bone template model;

wherein the nonconformity is used to set a constraint of the conforming bone template model to a value and the nonconforming bone model has the value for the constraint.

19 . A method for generating a bone model for a patient bone, in which each step is computer-implemented, comprising:

storing a conforming bone template model;

accepting a nonconformity of the patient bone; and

generating a nonconforming bone model using the nonconformity of the patient bone and the conforming bone template model;

wherein the nonconformity is used to set a constraint of the conforming bone template model to a value and the nonconforming bone model has the value for the constraint, wherein:

the constraint of the conforming bone template model is a distance from a joint to a plane of the nonconformity;

the nonconformity is used to set a second constraint of the conforming bone template model to a second value and the nonconforming bone model has the second value for the second constraint;

the nonconformity is used to set a third constraint of the conforming bone template model to a third value and the nonconforming bone model has the third value for the third constraint;

the second constraint of the conforming bone template model is a magnitude of the nonconformity expressed as an angle in the sagittal plane; and

the third constraint of the conforming bone template model is a magnitude of the nonconformity expressed as an angle in the frontal plane.

20 . A method for generating a bone model for a patient bone, in which each step is computer-implemented, comprising:

storing a conforming bone template model;

accepting a nonconformity of the patient bone;

generating a nonconforming bone model using the nonconformity of the patient bone and the conforming bone template model;

wherein the nonconformity is used to set a constraint of the conforming bone template model to a value and the nonconforming bone model has the value for the constraint;

accepting a bisection width;

accepting a deformity angle;

separating a first modeled bone segment from a second modeled bone segment by the bisection width;

rotating the first modeled bone segment by the deformity angle after separating the first modeled bone segment from the second modeled bone segment; and

lofting the first modeled bone segment to the second modeled bone segment after rotating the first modeled bone segment.

21 . A method for generating a bone model for a patient bone, in which each step is computer-implemented, comprising:

storing a conforming bone template model;

accepting a nonconformity of the patient bone;

generating a nonconforming bone model using the nonconformity of the patient bone and the conforming bone template model;

wherein the nonconformity is used to set a constraint of the conforming bone template model to a value and the nonconforming bone model has the value for the constraint;

accepting a bisection width;

accepting a deformity angle;

separating a first modeled bone segment from a second modeled bone segment by the bisection width;

accepting a scaling factor for the first modeled bone segment; and

scaling the first modeled bone segment independently of the second modeled bone segment using the scaling factor.