JP5383842B2 - Method of manufacturing auxiliary member for assisting hip replacement - Google Patents

Description

  The present invention provides an assisting member for assisting hip replacement that can directly display an appropriate setting position or direction based on a preoperative plan of an acetabular component and a femoral component used for hip replacement. It relates to the manufacturing method.

  First, hip replacement will be described. Hip replacement is an effective treatment method that can provide pain relief and functional recovery early after surgery for hip joint disease. For the pelvic acetabulum, the acetabular bone is excavated into a hemispherical socket type. The acetabular component is installed, and for the femur, the femoral neck that is a part of the femur is cut off, and the head of the femur that is a part of the femur is removed, and then connected to the ball and the ball Surgery to install a femoral component consisting of a rod-shaped stem.

  When performing such surgery, it is necessary to fix the acetabular component at an appropriate installation angle. If this installation angle is poor, it may cause complications such as post-operative dislocation. On the other hand, in the case of the femoral component, it is necessary to appropriately cut the femoral neck and to install the femoral component in an appropriate position and direction. If this osteotomy or the placement of the femoral component is improper, it will cause inconsistencies in leg lengths after surgery.

  Conventionally, for this hip joint operation, preoperative planning has been performed so that the components of the acetabulum and femur can be installed at appropriate positions using an X-ray image which is a two-dimensional image. However, the preoperative plan based on the two-dimensional image has problems such as that the enlargement rate of the X-ray image cannot be made constant and that the femur changes its shape due to the rotation of the lower limbs. Therefore, a method for preoperative planning by creating an arbitrary cross-sectional image or a three-dimensional image three-dimensionally using a CT (computer tomography) image has been performed. As a result, a three-dimensional preoperative plan for properly installing the acetabular component and the femoral component in three dimensions can be created. There was a problem that it was impossible to grasp where the installation position of the three-dimensional preoperative plan corresponds.

  In response to such problems, in recent years, a three-dimensional computer model of bone obtained from CT images and an actual bone, an infrared sensor provided in a surgical site, an optical camera installed in an operating room, etc. The acetabular excavation, the femoral neck osteotomy and the femoral excavation, and the acetabular component or the femoral component Computer navigation techniques have been developed that can guide the practitioner in the direction or position of installation, and some have already been used in clinical practice.

  A machine using such a computer navigation technique can display information such as the position of a surgical target site and the position or direction of a surgical instrument on a computer, but has several problems. The first problem is that it is necessary for the practitioner to operate the surgical instrument while looking at the computer display. Therefore, it is difficult to operate the surgical instrument so as to match the position and direction of the displayed surgical instrument. The second problem is that, in order to perform navigation surgery, expensive equipment that is not necessary in normal surgery, such as the sensor, is necessary to perform navigation surgery. In addition, when such expensive equipment and devices are jointly used in a plurality of hospitals, there is a possibility that problems may arise in terms of transportation.

  Under such circumstances, it is hoped that the installation position or direction of the artificial hip joint can be confirmed directly in the surgical field, instead of displaying the installation position or direction of the artificial hip joint in a place other than the surgical field, as in computer navigation surgery. It is rare. In addition, there is a need for expensive equipment required for navigation surgery, and for equipment and devices that are easy to transport so that the use facilities are not limited.

  An object of the present invention is to provide an artificial hip joint replacement assisting auxiliary member that can meet the above-described requirements and a method for manufacturing the same.

  That is, the method for manufacturing a hip replacement replacement assisting member according to the present invention is a method for manufacturing a hip replacement assisting member that can directly display the installation position or direction of the acetabular component or the femoral component in the surgical field. A method of creating a three-dimensional model of an artificial hip joint placement site; obtaining information including at least one of position and orientation for placing the acetabular component or femoral component; and a) A bone fitting portion that fits into at least a part of the three-dimensional model of the hip prosthesis installation site; and b) information including at least one of a position and a direction for installing the acetabular component or the femoral component is displayed. A three-dimensional model for creating an artificial hip joint replacement assisting auxiliary member having an installation information display unit for Comprising the step of creating, based on the three-dimensional model and the information section installation site.

  The information is an installation position and direction of the acetabular component or the femoral component based on a preoperative plan for hip replacement.

According to a first aspect of the present invention, there is provided a method for manufacturing an artificial hip joint replacement assisting auxiliary member according to the present invention, which can directly display the installation position or direction of the acetabular component in the surgical field. Because
Creating a three-dimensional model of the acetabulum that will be the site of the artificial hip joint;
Obtaining information including at least one of a position and a direction for installing the acetabular component; and a) a bone fitting part that fits at least a part of the three-dimensional model of the acetabular; b ) A three-dimensional model for creating an artificial hip joint replacement support auxiliary member having an installation information display unit that displays information including at least one of a position and a direction for installing the acetabular component. Creating based on the model and the information.

  The installation information display unit may include a hole through which a wire or a pin can be inserted, and the insertion direction is preferably parallel to the acetabular component installation direction.

  The step of creating the three-dimensional model of the acetabulum may include a step of obtaining medical image data including a acetabulum serving as a surgical site, and a step of creating a three-dimensional model of the image data.

  It is preferable that the bone fitting portion is created by a difference calculation that removes an overlapping portion between the arbitrary 3D model and the 3D model of the acetabulum from an arbitrary 3D model created on a computer.

  The manufacturing method according to the first aspect may further include a step of creating an artificial hip joint replacement assisting auxiliary member based on the three-dimensional model for creating an artificial hip joint replacement assisting auxiliary member, for example, by rapid prototyping Can be produced.

According to a second aspect of the present invention, there is provided a method for manufacturing an artificial hip joint replacement assisting member according to the present invention, in which the installation position or direction of the femoral component can be directly displayed in the surgical field. Because
Creating a three-dimensional model of the femur provided as an artificial hip joint placement site;
Obtaining information including at least one of a position and a direction for installing the femoral component; and a) a bone fitting portion that fits at least a part of the three-dimensional model of the femur; b ) A three-dimensional model for creating an artificial hip joint replacement support auxiliary member having an installation information display unit that displays information including at least one of a position and a direction for installing the femoral component. Creating based on the model and the information.

  The installation information display unit may include at least one of a slit, a concave portion, and a convex portion having a linear structure, and the slit is preferably provided along the osteotomy surface of the femoral neck. It is preferable that the part is provided in parallel to the installation direction of the femoral component.

  The step of creating the three-dimensional model of the femur may include a step of obtaining medical image data including the femur serving as a surgical site and a step of creating a three-dimensional model of the image data.

  The bone fitting portion may be created by a difference calculation that removes an overlapping portion between the arbitrary three-dimensional model and the three-dimensional model of the femur from an arbitrary three-dimensional model (for the bone fitting portion) created on a computer. it can.

  The manufacturing method according to the second aspect may further include a step of creating an artificial hip joint replacement assisting auxiliary member based on the three-dimensional model for creating an artificial hip joint replacement assisting auxiliary member, for example, by rapid prototyping Can be produced.

  The present invention includes a hip replacement assisting auxiliary member manufactured by the method of the present invention. The artificial hip joint replacement assisting auxiliary member manufactured by the method of the present invention includes a bone fitting part that can be fitted to at least a part of a acetabulum or a femur serving as a surgical site for performing the hip replacement; and hip replacement And an installation information display unit for providing information including at least one of a position and a direction for installing a acetabular component or a femoral component used in the present invention.

  According to the artificial hip joint replacement assisting auxiliary member manufactured by the method of the present invention, information for setting the acetabular component or the femur in an appropriate position or direction in the hip replacement is used. It can be obtained simply by fitting a support assisting member to the acetabulum or the femur, and the information is directly displayed in the operative field. Therefore, it is possible for the practitioner to perform a hip replacement surgery while looking at the surgical field. In addition, since the size of the assisting member for assisting hip replacement manufactured by the method of the present invention is within 10 cm, it is convenient to carry and without requiring expensive equipment as in the conventional computer navigation surgery. That's it.

It is a figure for demonstrating the preparation method of the three-dimensional model (for acetabulums) 7 for artificial hip joint replacement assistance support member creation for producing the artificial hip joint replacement assistance auxiliary member (for acetabulum) 8. FIG. 6 is a perspective view of a three-dimensional model 7 for creating an artificial hip joint replacement assisting auxiliary member for producing an artificial hip joint replacement assisting auxiliary member 8. It is a figure for demonstrating the usage method of the artificial hip joint replacement assistance auxiliary member. It is a figure for demonstrating the usage method of the artificial hip joint replacement assistance auxiliary member. It is a figure for demonstrating the usage method of the artificial hip joint replacement assistance auxiliary member. It is a figure for demonstrating the production method of the three-dimensional model (for femur) 18 for artificial hip joint replacement assistance auxiliary member creation for producing the artificial hip joint replacement assistance auxiliary member (for femur) 20. FIG. 11 is a perspective view of a three-dimensional model (for femur) 18 for creating an artificial hip joint replacement assisting auxiliary member. It is a figure for demonstrating the usage method of the artificial hip joint replacement assistance auxiliary member. It is a figure for demonstrating the usage method of the artificial hip joint replacement assistance auxiliary member.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the constituent elements described in this embodiment are merely examples, and are not intended to limit the scope of the present invention only to them.

The present invention relates to a method for manufacturing an artificial hip joint replacement assisting auxiliary member used in an artificial hip joint replacement operation in which an acetabular component or a femoral component is installed, and a three-dimensional model for manufacturing the artificial hip joint replacement assisting auxiliary member. Provide a method of creating a file on a computer.
The method of creating a three-dimensional model of an artificial hip joint replacement assisting member (for acetabulum) according to the present invention is to replace a steel wire, a Kirschner wire, a Hoffman pin or the like used when installing a acetabular component with an artificial hip joint replacement. A method for creating a three-dimensional model of an artificial hip joint replacement assisting member having an attachment guide hole for use in attaching to a planned position and direction determined in a preoperative plan of surgery,
Creating a three-dimensional model of the acetabulum that will be the site of the artificial hip joint;
Obtaining information including at least one of a position and a direction for installing the acetabular component;
An arbitrary three-dimensional model is created on a computer at a position at least partially overlapping with the three-dimensional model of the acetabulum, and an overlapping portion between the arbitrary three-dimensional model and the three-dimensional model of the acetabulum is removed by difference calculation, Creating a three-dimensional model with a bone fitting portion having a bone fitting portion capable of fitting with a computer;
An installation information display unit provided with a hole through which the fixture for displaying at least one of a position and a direction for installing the acetabular component is parallel to the installation direction of the acetabular component A step of creating a three-dimensional model on a computer based on the information acquired in the acquisition step; and combining the three-dimensional model with the bone fitting portion and the installation information portion three-dimensional model by a sum operation to obtain the artificial hip joint A step of creating a three-dimensional model of the replacement support auxiliary member.

The bone fitting part and the installation information display part are created by using a three-dimensional shape of a acetabulum or a femur as a surgical site. Further, the position and direction for installing the acetabular component or the femoral component used for the hip replacement are usually obtained by preoperative planning based on CT data of the surgical site where the hip replacement is performed.
It is preferable that the installation information display part has any one of a hole, a slit, a concave part, or a convex part for providing the information. The hole is preferably a hole parallel to the acetabular component installation direction, for example, a hole through which a steel wire, Kirschner wire, Hoffman pin, or the like can be inserted. The slit is preferably a slit provided along the osteotomy surface to indicate the osteotomy position or direction of the femoral neck, or a concave or convex portion parallel to the installation direction of the femoral component.

  As an embodiment of the hip replacement replacement assisting member of the present invention, mainly, (A) the hip replacement assisting support member used when displaying the installation direction in the acetabular component installation, and (B) the thigh Examples include a hip replacement replacement assisting member that displays the position or direction of the osteotomy line of the femoral head for specifying the bone component installation position and the insertion direction of the femoral component. Each will be described in detail below.

[A: assistive member for assisting hip replacement for acetabular component installation]
One example of an artificial hip joint replacement assisting auxiliary member used for installing the acetabular component and a method for manufacturing and using the same will be described with reference to FIGS.

  The artificial hip joint replacement assisting auxiliary member for installing the acetabular component is first created on a computer by creating a three-dimensional model (for acetabulum) for creating an artificial hip joint replacement assisting member. The manufacturing method of the three-dimensional model (for acetabulum) 7 for creating the artificial hip joint replacement assisting auxiliary member and the artificial hip joint replacement assisting auxiliary member (for acetabular) 8 is as follows.

(1) FIG. 1 is a diagram for explaining a method of creating a three-dimensional model (for acetabulum) 7 for creating an artificial hip joint replacement assistance auxiliary member for producing an artificial hip joint replacement assistance auxiliary member.
Medical image data of the pelvis including the acetabulum, which is one of the surgical sites when an artificial hip joint is installed, is acquired by CT (tomographic imaging) or the like. By importing the medical image data into the computer, the acetabulum and pelvis, which are one of the surgical sites when the artificial hip joint is installed, are respectively referred to as the acetabular three-dimensional model 2 and the pelvis three-dimensional model 1 on the computer. Can be created.

(2) Next, an arbitrary three-dimensional three-dimensional model 3 is created at a position overlapping with the acetabular three-dimensional model 2 on the computer.

(3) Subsequently, in FIG. 1, the bone fitted to the acetabulum by the difference calculation that removes the overlapping portion of the three-dimensional three-dimensional model 3 and the acetabular three-dimensional model 2 from the three-dimensional three-dimensional model 3. A three-dimensional model with a bone fitting part (for acetabulum) having a fitting part is created.
FIG. 2 is a perspective view of a three-dimensional model 7 for creating a hip replacement support assisting member 8 created by the method shown in FIG. Reference numeral 6 denotes a bone fitting portion that can be fitted to the acetabular three-dimensional model 2 in the three-dimensional model 7 for creating an artificial hip joint replacement assisting auxiliary member shown on a computer.

(4) Further, on the computer shown in FIG. 1, an installation information display unit that can provide information on an appropriate installation direction of the acetabular component obtained by the three-dimensional preoperative plan is created.
Here, in the case of an artificial hip joint replacement assisting auxiliary member for setting the acetabular component, for example, a steel wire, a Kirschner wire, a Hoffman pin or the like is inserted in parallel with the acetabular component setting direction as the installation information display unit The hole which enables is mentioned. For example, in the setting information display unit three-dimensional model (for acetabulum) 4 in the three-dimensional model 7 for creating an artificial hip joint replacement support auxiliary member on the computer shown in FIG. 1, a steel wire can be inserted parallel to the installation direction. This is a member having a hole 5 that can be formed.

(5) An artificial hip joint replacement assisting member is created by combining the three-dimensional model with bone fitting part (for acetabulum) and the installation information display part three-dimensional model (for acetabulum) 4 by sum operation. 3D model (for acetabulum). By creating the three-dimensional model (for acetabulum) 7 for creating the artificial hip joint replacement assisting auxiliary member by rapid prototyping such as stereolithography, the artificial hip joint replacement assisting auxiliary member (for acetabulum) according to the present embodiment 8 (see FIG. 3) is obtained.

Next, a method of using the artificial hip joint replacement assisting auxiliary member (for acetabulum) 8 will be described with reference to FIGS.
3-5, the code | symbol 10 is the acetabulum in the operative field during the operation of hip replacement.

  The artificial hip joint replacement assisting auxiliary member (for acetabulum) 8 produced above provides the bone fitting part (for acetabulum) 9 that can be fitted to the acetabulum 10; and information necessary for installation of the acetabular component An installation information display unit (for acetabulum) 11 is provided. The installation information display unit (for acetabulum) 11 displays the direction in which the acetabular component is installed in the operative field, and includes a hole 13 through which the steel wire 12 can be inserted in parallel to the installation direction.

  FIG. 3 shows a state before the artificial hip joint replacement assisting auxiliary member 8 is fitted to the acetabulum 10 in the surgical field, and FIG. 4 shows the artificial hip joint replacement assisting auxiliary member 8 in the acetabulum 10. Shows the state of fitting.

  Since the acetabulum 10 fitted with the bone fitting portion (for acetabulum) 9 can be directly seen in the operative field, it is possible to confirm whether the fitting is properly performed. The position of the fitted artificial hip joint replacement assisting auxiliary member 8 relative to the acetabulum 10 is the position of the three-dimensional model 7 for creating the artificial hip joint replacement assisting auxiliary member created on the computer relative to the three-dimensional model 2 of the acetabulum. Will match. The match means that the fitting relationship between the three-dimensional model 7 for creating the support auxiliary member on the computer and the three-dimensional model 2 of the acetabulum was able to be achieved even on the ground, and formed into the three-dimensional model 7 for creating the support auxiliary member. The formed through-hole 5 is formed in parallel to the acetabular component installation direction. Therefore, the hole 13 provided in the installation information display part (for acetabulum) 11 of the artificial hip joint replacement assisting auxiliary member 8 enables a steel wire or the like to be inserted parallel to the installation direction of the acetabular component, Information regarding the direction in which the acetabular component is placed will be displayed.

  FIG. 4 shows a state in which, for example, in the installation information display unit (for acetabulum) 11, a steel wire 12 is inserted into the hole 13 and the steel wire is pierced and fixed to the acetabulum 10 as it is. Thus, when the steel wire 12 inserted through the hole 13 is stabbed into the acetabulum 10 and fixed in the installation information display section (for acetabulum) 11, the direction of the steel wire 12 exactly installs the acetabular component. Will match the direction.

  After piercing and fixing the steel wire 12 to the acetabulum 10, the artificial hip joint replacement assisting auxiliary member 8 is removed from the acetabulum 10 by removing the hole 13 from the steel wire 12. FIG. 5 shows a state in which the hip replacement assisting auxiliary member 8 is removed from the acetabulum 10. In the state shown in FIG. 5, the artificial hip joint replacement assisting auxiliary member 8 is removed from the acetabulum 10 in the operative field, but the direction of the steel wire 12 fixed earlier installs the acetabular component. Since the direction coincides with the direction, an operation for installing the acetabular component may be performed in the operative field while directly viewing the steel wire 12.

  In addition, in the said form, although the steel wire was used as what is inserted three-dimensionally in parallel with the installation direction of the said acetabular component, a Kirschner wire, a Hoffman pin, etc. may be penetrated.

  As described above, the artificial hip joint replacement assisting auxiliary member for installing the acetabular component in the direction obtained from the three-dimensional preoperative plan on the acetabulum, which is a surgical site, includes the acetabular component. The installation information display section for providing information on a direction in which the acetabular component is installed, that is, a portion having a hole through which a Kirschner wire or a Hoffmann pin, which is a steel wire, can be inserted three-dimensionally parallel to the installation direction. In addition, since the bone fitting portion that fits into the acetabulum at the same time is provided, the installation direction of the acetabular component can be directly displayed in the operative field by fitting into the acetabulum during the operation. Further, whether or not the hip replacement replacement support auxiliary member functions can be confirmed by looking at the fitting portion of the hip replacement replacement support auxiliary member and the acetabulum.

[B: Artificial joint setting auxiliary member for setting femoral component]
Next, a manufacturing method and a usage method of an example of an artificial joint placement assisting member for placing the femoral component will be described.

  When manufacturing an artificial joint placement assisting member, first, it is made by creating a three-dimensional model (for femur) for creating an artificial hip joint replacement assisting assisting member on a computer. A manufacturing method and a usage method of the three-dimensional model (for femur) 18 and the artificial joint placement assisting member (for femur) 20 for creating the artificial hip joint replacement assisting auxiliary member are as follows.

(1) FIG. 6 illustrates a method of creating a three-dimensional model (for femur) 18 for creating a hip replacement replacement assisting member 20 in creating the hip replacement assisting assisting member 20 for installing a femoral component. FIG.

  Medical image data of the femur, which is one of the surgical sites when installing an artificial hip joint, is acquired in advance by CT (tomographic imaging) or the like. By fetching the medical image data into a computer, the femur, which is one of the surgical sites when the artificial hip joint is installed, can be created as a femoral three-dimensional model 14 on the computer.

(2) Next, in FIG. 6, an arbitrary three-dimensional three-dimensional model (for femur) (not shown in FIG. 6) is created at a position overlapping with the three-dimensional femur three-dimensional model 14 on the computer.

(3) Subsequently, in FIG. 6, an overlapping portion of the arbitrary three-dimensional three-dimensional model (for femur) (not shown in FIG. 6) and the femoral three-dimensional three-dimensional model 14 is defined as the arbitrary three-dimensional three-dimensional model. Bone fitting having a bone fitting portion (for femur) 19 (not shown in FIG. 6; shown in FIG. 7) that fits with the three-dimensional femur three-dimensional model 14 by the difference calculation removed from the model (for femur) A partial three-dimensional model (for femur) 15 is created.

(4) Further, in FIG. 6, an installation information display unit that can provide information on an appropriate installation direction of the femoral component obtained from the three-dimensional preoperative plan is created. As an artificial joint installation auxiliary member (for the femur), for example, a slit 17 along the osteotomy surface for cutting the femoral neck at an appropriate position or direction with a saw tool such as a bone saw, for example, the femur A convex portion or a concave portion for indicating the component insertion direction, that is, a convex portion parallel to the installation direction, or a concave portion such as a groove parallel to the installation direction may be used. The slit part for performing osteotomy of the femoral neck part at an appropriate position or direction with a saw tool such as a bone saw, and the convex part or the concave part for indicating the insertion direction of the femoral component may have either one. .

  In the aspect of FIG. 6, the groove 16 recessed parallel to the installation direction of the femoral component and the slit 17 for performing femoral neck osteotomy correspond to the installation information display unit. In the example of FIG. 6, although the installation information display part called the groove | channel 16 and the slit 17 is provided, any one may be sufficient.

  The groove 16 creates, for example, a cylindrical three-dimensional model having a linear structure parallel to the installation direction of the femoral component, and the cylindrical three-dimensional model and a three-dimensional model with a bone fitting portion (for femur) 15 are formed. The overlapping portion can be obtained by a difference calculation that removes the three-dimensional model (for femur) 15 having a bone fitting portion.

(5) In order to create the slit 17, for example, a rectangular parallelepiped model including an osteotomy surface is created, and a portion where the rectangular parallelepiped model overlaps the bone-fitting portion three-dimensional model (for femur) 15 It can be obtained by a difference calculation that is removed from the three-dimensional model with fitting portion (for femur) 15.

(6) Through the above-described process, as shown in FIG. 7, an installation information display unit that can provide information on an appropriate installation direction of the femoral component, that is, any one of a convex part and a concave part parallel to the installation direction. An installation information display unit 16 having a linear structure; and an installation information display unit 17 having a slit structure indicating the position or direction of the osteotomy line for cutting the femoral neck, and the femur A three-dimensional model (for femur) 18 for creating an artificial hip joint replacement assisting auxiliary member having a bone fitting portion (for femur) 19 to be fitted to 14 can be created on a computer. Based on the three-dimensional model (for femur) 18 for creating an artificial hip joint replacement assisting member created on this computer, the hip replacement replacement assisting member (for femur) is performed by rapid prototyping such as stereolithography. 20 can be manufactured.

In the artificial hip joint replacement assisting auxiliary member 20 shown in FIG. 8, 22 is a bone fitting portion that can be fitted to the femur 21 as a surgical site, and 23 indicates a position or direction for performing femoral neck osteotomy. An installation information display unit 24 having a slit structure for performing the installation, and an installation information display unit 24 having a linear structure parallel to the installation direction for appropriately installing the femoral component.
In the artificial hip joint replacement assisting assisting member 20, the installation information display section, the slit 23 for displaying the position or direction for performing osteotomy, and the installation direction for appropriately installing the femoral component Although both of the grooves 24 are parallel to each other, only one of them may be provided.

  Next, a method for using the artificial hip joint replacement assisting auxiliary member (for femur) 20 manufactured as described above in the hip replacement using the femoral component will be described with reference to FIGS. .

  FIG. 8 shows a state before the bone fitting portion (femur) 22 to be fitted to the femur 21 of the artificial hip joint replacement assisting auxiliary member 20 is fitted to the femur 21. FIG. 9 shows a state where the artificial hip joint replacement assisting auxiliary member 20 is fitted to the femur 21.

  The position of the fitted hip replacement support assisting member 20 with respect to the femur 21 is a three-dimensional model for creating a hip replacement support assisting member for creating a hip replacement assisting assist member created on a computer (thigh) (For bone) 18 matches the position of the three-dimensional model of the femur. The matching means that the artificial hip joint replacement assisting auxiliary member 20 has an installation information display section which is information necessary for the installation of the femoral component, so that the position or direction necessary for installing the femoral component can be determined. It can be displayed. That is, the artificial hip joint replacement assisting auxiliary member 20 is provided with an installation information display unit 23 having a slit structure for displaying a position or direction for performing osteotomy of the femoral neck, and for installing the femoral component. Since it has either or both of an installation information display unit 24 having a linear structure of either one of a convex part and a concave part parallel to the installation direction for displaying an appropriate installation direction, osteotomy of the femoral neck is performed. Either or both of the indication of the position or direction to perform and the indication of the appropriate orientation of the femoral component can be made directly in the operative field.

  Thus, since the bone fitting part (femur) 22 and the femur 21 fitting with the bone fitting part (femur) 22 can be directly seen in the operative field, fitting is performed appropriately. You can check if Then, the position or direction necessary for installing the femoral component is displayed. Further, the installation display units 23 and 24 display a position or direction for performing the osteotomy of the femoral neck and an appropriate installation direction for installing the femoral component.

  The artificial hip joint replacement assisting auxiliary member manufactured as described above can be applied to the acetabulum or the femur, which is a surgical site where any of the acetabular component or the femoral component is installed. In addition, the artificial hip joint replacement assisting auxiliary member provides the installation information display unit that provides at least one of the position and direction for installing any of the acetabular component or the femoral component planned before the operation. Therefore, if the artificial hip joint replacement support assisting member is fitted to the acetabulum or femur, which is the surgical site, it is simultaneously positioned and oriented to install any of the previously planned components. At least one of the information can be displayed in the operative field.

As described above, the artificial hip joint replacement assisting auxiliary member manufactured by the method of the present invention is obtained by fitting the femoral component by the three-dimensional preoperative plan by fitting the femoral component that is the surgical site. Information for installation in the position or direction (position or direction of osteotomy of the femoral neck and the direction in which the femoral component is installed) can be displayed in the surgical field (for example, an artificial for installing a B type femoral component) Information for installing in the position or direction obtained by 3D preoperative planning by fitting to the acetabulum, which is the surgical site (in the case of a joint placement assisting member) (direction matching the placement direction position of the acetabular component) ) Can be fixed to the surgical field.
Therefore, the practitioner uses the artificial hip joint replacement assisting auxiliary member manufactured by the method of the present invention as described above, and is necessary for installing the femoral component or the acetabular component obtained by the preoperative planning. Information, that is, the position or direction of femoral neck osteotomy, the femoral component installation direction, and the acetabular component installation direction position, which are necessary for hip replacement, can be confirmed in the surgical field. In addition, since the hip replacement support assisting member manufactured by the method of the present invention is compact in size, it is convenient to carry and does not require expensive equipment such as conventional computer navigation surgery.

  Furthermore, whether or not the bone fitting portion is fitted to the acetabulum or femur serving as a surgical site, that is, whether or not the artificial hip joint replacement assisting auxiliary member functions can be confirmed in the operative field during the operation. .

  The artificial hip joint replacement assisting auxiliary member manufactured by the method of the present invention can provide necessary information such as the installation position or direction of the femoral component or the acetabular component based on the preoperative plan without requiring expensive equipment. Since it can be confirmed in the field, it is very useful as an auxiliary member for assisting hip replacement.

1. 1. Pelvic solid model on computer 2. Three-dimensional model of acetabular solid on computer 3. Any three-dimensional three-dimensional model on the computer An installation information display unit three-dimensional model having a hole 5 that allows a steel wire to be inserted parallel to the acetabular component installation direction in the three-dimensional model 7 for creating an artificial hip joint replacement assisting auxiliary member shown on a computer ( (For acetabulum)
5. 5. Hole for enabling insertion of a steel wire parallel to the acetabular component installation direction in the three-dimensional model 7 for creating an artificial hip joint replacement assisting auxiliary member shown on a computer 6. Bone fitting part 7 that can be fitted to the acetabular three-dimensional model 2 in the three-dimensional model 7 for creating an artificial hip joint replacement assisting auxiliary member shown on a computer. Three-dimensional model (for acetabulum) for creating assistive hip replacement support members shown on a computer
8). Auxiliary replacement for hip replacement (for acetabulum)
9. Bone fitting part (for acetabulum) in artificial hip joint replacement assisting auxiliary member 8
10. Acetabulum 11. An installation information display unit (for acetabulum) having a hole 13 that allows the steel wire 12 to be inserted parallel to the acetabular component installation direction of the artificial hip joint replacement assisting auxiliary member 8.
12 Steel wire 13. 13. Hole 14 for enabling insertion of a steel wire 12 parallel to the acetabular component installation direction of the artificial hip joint replacement assisting auxiliary member 8. 15. Femoral solid three-dimensional model shown on a computer; Three-dimensional model with bone-fitting part shown on computer (for femur)
16. An installation information display unit 17, which is a linear structure parallel to the installation direction of the femoral component of the three-dimensional model (for femur) 18 for creating an artificial hip joint replacement assisting auxiliary member shown on the computer. An installation information display unit 18, which is a slit structure for performing femoral neck osteotomy of a three-dimensional model (for femur) 18 for creating an artificial hip joint replacement assisting auxiliary member shown on a computer. Three-dimensional model (for femur) for creating artificial hip joint replacement assisting auxiliary members shown on a computer
19. Bone fitting part (for femur) of a three-dimensional model (for femur) 18 for creating an artificial hip joint replacement assisting member shown on a computer and fitting with the three-dimensional model 14 of the femur three-dimensional model 14
20. Auxiliary replacement for hip replacement (for femur)
21. Femur 22. Bone fitting portion 23 of the artificial hip joint replacement assisting auxiliary member 20 fitting with the femur 21. Installation information display section 24. which is a slit structure for displaying the position or direction for performing femoral neck osteotomy in the artificial hip joint replacement assisting auxiliary member 20. An installation information display unit having a linear structure parallel to the installation direction for appropriate installation of the femoral component in the artificial hip joint replacement assisting auxiliary member 20

Claims (6)

Equipped with a guide hole for attachment used when attaching a fixture such as a steel wire, Kirschner wire, or Hoffmann pin used when installing the acetabular component to the planned position and direction determined in the preoperative plan of hip replacement surgery A method of creating a three-dimensional model of a hip replacement replacement assisting member,
Creating a three-dimensional model of the acetabulum that will be the site of the artificial hip joint;
Obtaining information including at least one of a position and a direction for installing the acetabular component ;
Before any of the three-dimensional model created on a computer to at least partially overlap position with Kiusufuta of the three-dimensional model, the overlapping portion of the three-dimensional model of the with the any of the three-dimensional model acetabulum removed by subtraction, mortar Creating a three-dimensional model with a bone fitting portion having a bone fitting portion capable of fitting with a lid on a computer;
Before hole capable inserting the fixture for displaying at least one of the position and the direction for installing the Kiusufuta components, installation information display which is provided parallel to the installation direction of the acetabular component Creating a three-dimensional model of a part on a computer based on the information obtained in the obtaining step; and
Combining the bone fitting portion having three-dimensional model and the installation information portion three-dimensional model by a sum operation to create a three-dimensional model of the artificial hip joint replacement support auxiliary member,
A method of creating a three-dimensional model of an auxiliary member for assisting hip replacement. The step of creating the three-dimensional model of the acetabulum,
The process according to claim 1 including the step of creating a three-dimensional model of the process, and the image data to acquire medical image data including the acetabulum as a surgical site. Said information how to create claim 1 or 2, which is the installation position and orientation based on the preoperative planning of hip replacement surgery. Equipped with a guide hole for attachment used when attaching a fixture such as a steel wire, Kirschner wire, or Hoffmann pin used when installing the acetabular component to the planned position and direction determined in the preoperative plan of hip replacement surgery A method of manufacturing an auxiliary member for assisting hip replacement,
Creating a three-dimensional model for creating a hip replacement replacement assisting member by the method according to claim 1; and
The artificial hip replacement assistance based on the auxiliary member for creating three-dimensional models, including Manufacturing method steps of manufacturing an artificial hip replacement support auxiliary member. The manufacturing method according to claim 4 , wherein the artificial hip joint replacement assisting auxiliary member is manufactured by rapid prototyping. An artificial hip joint replacement assisting auxiliary member manufactured by the method according to claim 4 or 5 .

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