JP2023021609A - Aid for hip joint surgery - Google Patents

Abstract

To provide an aid for surgery suitable for surface replacement type artificial hip joint replacement surgery, which is fixed without being detached from a prescribed position of the thighbone when a guide pin is inserted.SOLUTION: An aid for surgery used for surface replacement type artificial hip joint surgery includes: a guide part 2 having a through hole 21 into which a guide pin is inserted; a reference part 3 having a contact region designed to fit with the shape of a part of the thighbone peculiar to a patient; and an arm part 4 for connecting the guide part and the reference part together. The guide part determines insertion position and angle of the guide pin into the thighbone head. The contact region includes a first area 311 designed so as to fit with the shape of the intertrochanteric crest, and cover a raised part of the intertrochanteric crest, a second area 321 that fits with the shape of a neck part of the thighbone, and a third area 322 that fits with the shape of a piriform recess located between the intertrochanteric crest and the neck part.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to an aid for hip joint surgery, a method for designing an aid for hip joint surgery, and a method for manufacturing an aid for hip joint surgery.

As a therapeutic method for hip joint surgery, a technique is known in which a damaged surface such as a head of a bone is removed and then replaced with an artificial hip joint. Artificial hip joint replacement includes a total replacement type in which the majority of the hip joint is replaced with an artificial material (implant) and a surface replacement type in which only the surface of the femoral head is replaced with an implant. Resurfacing hip arthroplasty (HRA) is characterized by bone preservation and high dislocation resistance, and in recent years, it has been reported that relatively young patients can achieve a favorable postoperative course. (See Non-Patent Documents 1 and 2).

In artificial hip joint replacement surgery, it is important to place the implant in an appropriate position in order to reduce the risk of postoperative complications. In resurfacing surgery, the position of the guide pin inserted into the femoral head at the beginning has a great influence on the subsequent placement of the implant.
It is possible to check whether the guide pin is inserted in the correct position during surgery using an X-ray image or the like (for example, Patent Document 1). was greatly influenced by the power of

In view of these problems, patient-specific guidewire alignment guides have been developed. For example, U.S. Pat. No. 6,300,000 discloses a device for pin placement that conforms to a patient's femoral head and includes an aperture that defines the angle and location for the cut into the femoral head.
Further, Patent Document 3 describes an alignment guide that has a member that covers the neck and femoral head and is configured to match the shape of the patient's femur.

As described above, by using an auxiliary tool customized to a patient-specific shape, it is possible to determine the insertion position of the guide wire without performing X-ray imaging or the like during surgery.
However, there is a possibility that necrosis of the femoral head progresses during the time from the manufacture of the assisting device to the time before surgery, and the shape of the femoral head changes from that at the time of measurement. In this case, there is a problem that the shape of the alignment guide does not match the femoral head of the patient, and the guide cannot be installed at an appropriate position.

In addition, in surface replacement surgery, compared to total replacement surgery, the invasiveness to the patient is minimized and the surgery is performed to preserve muscle tissue as much as possible. There was a circumstance that it was difficult to divert the instruments etc.

JP 2014-097220 A Japanese Patent Publication No. 2010-533043 Japanese Patent Publication No. 2012-525941

Akira Takahashi, Yusuke Takashina, Kenshi Ishii, Daisuke Koga, Short-term results of resurfacing hip arthroplasty for young men, Hip Joint Vol. 46, No. 2, pp. 805-807, 2020 Daniel J, et al: Results of Birmingham hip resurfacing at 12 to15 years: a single-surgeon series. Bone Joint J 96-B:1298-1306, 2014.

In view of the above circumstances, an object of the present invention is to provide a surgical aid suitable for surface replacement type artificial hip joint replacement surgery, which is fixed without detachment from a prescribed position of the femur when a guide pin is inserted. do.

Another object of the present invention is to provide a design method and a manufacturing method for easily manufacturing the surgical aid.

The present invention for solving the above problems is a surgical aid used in surface replacement type artificial hip joint surgery,
a guide portion having a through hole for inserting the guide pin;
a reference portion having a contact area designed to match the shape of a patient-specific portion of the femur;
an arm portion connecting the guide portion and the reference portion;
with
The guide part determines the insertion position and angle of the guide pin into the femoral head,
The contact area has a first area that conforms to the shape of the intertrochanteric crest and is designed to cover the ridge of the intertrochanteric crest and a second area that conforms to the shape of the neck of the femur. and a third area conforming to the shape of the pyriform fossa located between the intertrochanteric crest and the neck.

The present invention having the above configuration can be stably fixed to the patient's femur, and the insertion position and direction of the guide pin can be easily determined simply by inserting it along the through hole of the guide portion. Also, the contact area matches the shape of the intertrochanteric crest, neck, and pyriform fossa rather than the femoral head, where the shape of the bone does not change, thus ensuring that the instrument follows the shape of the three points. can be fixed.

In a preferred form of the present invention, the first area is 1/4 to 1/2 of the total length of the intertrochanteric ridge extending over the greater trochanter and the lesser trochanter, including the central portion of the intertrochanteric ridge. matches the shape of the range of .
The present invention having the above characteristics adopts a configuration in which the contact area is set only on a part of the intertrochanteric crest, so that muscle fibers and tendons connecting to the greater trochanter and the lesser trochanter are not excised during surgery. Surgical aids can be placed and the patient's muscle fibers and tendons can be preserved as much as possible.

In a preferred embodiment of the present invention, the reference section includes a plurality of fixed wire insertion holes for inserting fixed wires, and the fixed wire insertion holes are provided in each of the first area and the second area. provided above.
By providing the fixing wire insertion holes in the first area and the second area, the reference part can be fixed with the wire from both sides of the neck and the intertrochanteric crest, and the fixation stability of the surgical aid during surgery is improved. can increase

In a preferred form of the invention, the guide part is provided so as to be spaced apart from the femoral head.
By separating the guide portion from the femoral head, the guide pin can be inserted while confirming the state of the femoral head, and the pin insertion speed and the like can be easily adjusted.

The present invention also provides a method for designing a surgical aid used in surface replacement type artificial hip joint surgery, comprising:
a guide portion designing step of determining an insertion position and angle of a guide pin to be inserted into the femoral head based on a 3D image of the patient's femur and designing the guide portion;
a reference part designing step of designing the reference part based on the shapes of the intertrochanteric crest, neck, and pyriform fossa in the 3D image;
and designing the arm portion connecting the guide portion and the reference portion.

The present invention also provides a method for manufacturing a surgical aid used in surface replacement type artificial hip joint surgery, comprising:
a guide portion designing step of determining an insertion position and angle of a guide pin to be inserted into the femoral head based on a 3D image of the patient's femur and designing the guide portion;
a reference part designing step of designing the reference part based on the shapes of the intertrochanteric crest, neck, and pyriform fossa in the 3D image;
and designing the arm portion connecting the guide portion and the reference portion.

INDUSTRIAL APPLICABILITY According to the present invention, a resurfacing prosthesis that can be easily and quickly placed at an appropriate position on a patient's femur during surgery and is fixed without detachment from a prescribed position on the femur when a guide pin is inserted. A surgical aid suitable for hip joint replacement surgery can be provided.

Moreover, according to the present invention, it is possible to provide a design method and a manufacturing method for easily manufacturing the surgical aid.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure of the surgical aid which concerns on one Embodiment of this invention, Comprising: (a) and (b) are perspective views, (c) is a top view. It is a 3D image of the femur proximal part in the femur posterior surface direction, (a) is a view showing the femur posterior surface side, and (b) is a perspective view of (a). 3 is a 3D image representing an example of use of a surgical aid according to an embodiment of the present invention; It is a figure which shows the procedure of the design method of the surgical aid of this invention, and a manufacturing method.

The surgical aid 1 of the present embodiment, its design method and manufacturing method will be described below, but the present invention is not limited to the embodiment, and design changes can be made as appropriate.

In the present invention, the "pin" and "wire" are, for example, rod-shaped members having appropriate strength, and are preferably metal members such as stainless steel. Pins and wires of any diameter can be selected according to the purpose.

(1) Surgery Auxiliary Tool A surgical aid 1 of this embodiment includes a guide part 2, a reference part 3 having a contact area designed to match the shape of a part of the femur unique to a patient, An arm portion 4 connecting the guide portion 2 and the reference portion 3 is provided.
A preferred embodiment of the surgical aid 1 will be described in detail below with reference to FIGS. 1 to 3. FIG.

As shown in FIG. 1, the guide portion 2 includes a through hole 21 that penetrates through a portion of the guide portion 2 and into which a guide pin is inserted. The reference part 3 comprises a contact area that conforms to the patient's specific femoral shape. The arm part 4 connects the guide part 2 and the reference part 3 so that the through hole 21 is provided at an appropriate position and angle when the surgical aid 1 is installed according to the shape of the reference part 3 .
The operator can insert the guide pin along the through-hole 21 at an appropriate position and angle simply by fixing the surgical aid 1 to an appropriate position on the femur of the patient.

Here, the shape and size of the guide part 2 are not particularly limited, but a preferable form includes, for example, a cylindrical shape such as a cylinder or a prism. In the present invention, it is preferable that the guide portion 2 is cylindrical.

The length of the through-hole 21 of the guide portion 2 can be any length, but is preferably within the range shown below.
That is, the lower limit of the length of through-hole 21 is preferably 20 mm or longer, more preferably 30 mm or longer. By setting the lower limit of the length of the through hole 21 within the above range, the direction of the guide pin can be determined accurately.
The upper limit of the length of through-hole 21 is preferably 45 mm or less, more preferably 40 mm or less. By setting the upper limit of the length of the through hole 21 within the above range, the resistance when inserting the guide pin can be reduced.

The reference part 3 comprises a contact area that matches the shape of the femur. The contact area consists of a first area 311 that conforms to the shape of the intertrochanteric crest 53 and is designed to cover the ridge of the intertrochanteric crest 53 and a second area that conforms to the shape of the neck 52 of the femur. It includes an area 321 and a third area 322 that conforms to the shape of the pyriform fossa 54 located between the intertrochanteric crest 53 and the neck 52 (see FIGS. 1(b) and (c)).
It should be noted that, as shown in FIG. 2, the pyriform fossa 54 is positioned between the intertrochanteric crest 53 and the neck 52 and indicates a depression present inside the intertrochanteric crest 53 .

FIG. 3 shows a 3D image of the surgical aid 1 of this embodiment installed on the proximal femur 5 of a patient. As described above, the surgical aid 1 of the present embodiment uses only a limited portion of the side of the femur as a contact area, but the three points of the intertrochanteric crest 53, the neck 52, and the pyriform fossa 54 are used as the contact area. By using the contact area, the position is not displaced due to vibration caused by insertion of the guide pin, etc., and is stably fixed to the femur.

Further, unlike the femoral head 51, the intertrochanteric crest 53, the neck 52, and the pyriform fossa 54 are regions whose shape is less likely to change as the disease worsens. Therefore, the shape of the contact area with the above three points as references can match the shape of the femur of the patient without error even during surgery.

The first area 311 that conforms to the shape of the intertrochanteric crest 53 is preferably shaped to conform to the intertrochanteric crest center 531 portion.
In a preferred form of the present invention, the first area 311 is a range including the intertrochanteric crest center 531 portion, and the entire length of the intertrochanteric crest 53 extending over the greater trochanter 55 and the lesser trochanter 56 (Fig. For 2(a) L), it is provided to match the shape of the intertrochanteric crest within a predetermined range.

The lower limit of the predetermined range is preferably 1/4 or more, more preferably 1/3.5 or more, and more preferably 1/3 or more of the total length L of the intertrochanteric crest 53 .
By setting the first area 311 within the above range, the fixation stability of the surgical aid 1 is improved.

The upper limit of the predetermined range is preferably 1/2 or less, more preferably 1/2.5 or less, and more preferably 1/3 or less of the total length L of the intertrochanteric crest 53. .
By setting the first area 311 within the above range, invasiveness to the patient can be minimized during surgery.

Specifically, the first area 311 preferably conforms to the shape of about ⅓ of the total length L of the intertrochanteric ridge, including the center 531 of the intertrochanteric ridge.

The second area 321 that conforms to the shape of the neck 52 is preferably provided to conform to the shape of only a portion of the neck 52 rather than occupying the entire area of the neck 52 , ie, the entire circumference of the neck 52 . In this embodiment, the second area 321 preferably has a shape that matches the shape of the portion of the posterior surface of the neck 52 that has the intertrochanteric crest 53 .

The third area 322, which conforms to the shape of the pyriform fossa 54, is provided to conform to the shape of the depression of the pyriform fossa 54, and in this embodiment, unlike the other areas of the contact area, the third area 322 has a protrusion. It has a rectangular shape (see FIG. 1).
Since the surgical aid 1 has the third area 322, the installation position can be easily recognized by using the position of the pyriform sinus 54 as a mark, and the installation time of the instrument can be shortened during surgery. can.

Further, as shown in FIG. 1, the surgical aid 1 according to the present embodiment is provided with the reference part 3 so as to come into contact with a partial area of the posterior surface of the femur. It has the advantage of being easier to attach and detach from the femur than existing alignment guides.

Moreover, in the present embodiment, as shown in FIG. It is preferable to set a third area 322 that matches with . By adopting such a form, the second area 321 and the third area 322 can be provided in one block (the second block 32), and the size of the reference section 3 can be minimized. can.

Moreover, the reference part 3 preferably has a fixed wire insertion hole for inserting a fixed wire. The fixation wire insertion holes can be provided at multiple locations on the reference part 3, preferably in a first area 311 that conforms to the shape of the intertrochanteric crest 53 and a second area that conforms to the shape of the neck 52. 321, respectively. In this embodiment, the surgical aid 1 includes a fixed wire insertion hole 311a provided in the first area 311 and a fixed wire insertion hole 321a provided in the second area 321 (FIG. 1B). )).
By providing fixing wire insertion holes in the first area 311 and the second area 321 , the surgical aid 1 can be fixed from two sides, the intertrochanteric crest 53 and the neck 52 . can increase the fixing stability of

Further, as shown in FIG. 1 , the arm portion 4 connects the guide portion 2 and the reference portion 3 . In this embodiment, the arm portion 4 connects the guide portion 2 and the reference portion 3 so that the guide portion 2 is separated from the femoral head 51 .
By separating the guide part 2 and the femoral head 51 in this way, the guide pin can be inserted while confirming the state of the femoral head 51, and the pin insertion speed and the like can be easily adjusted during surgery.

The shape of the arm portion 4 is not particularly limited as long as it can fix the guide portion 2 and the reference portion 3 so that the positional relationship between the two parts does not change. It can have a three-dimensional shape.

The surgical aid 1 according to the present embodiment is preferably made of a material that is durable and resistant to sterilization treatment such as alcohol. Specifically, ABS resin, PLA resin, ASA resin, PET resin, PETG resin, epoxy resin, acrylic resin, polycarbonate resin, thermosetting resin, photo-curable acrylic resin, metal, gypsum, etc. can be used. . In the present invention, it is preferable to use a photocurable resin, an ABS resin, a PLA resin, or a PETG resin from the viewpoints of easy acquisition and excellent moldability.

(2) Method for Designing Surgery Auxiliary Tool Hereinafter, the method for designing the surgical aid 1 of the present invention (hereinafter simply referred to as the design method) will be further described. The description of the configuration, dimensions, materials, etc. of the surgical aid described in (1) Surgical aid is incorporated in the design method of the present invention.

The design method of the present invention includes a guide portion designing step S1 for designing a guide portion based on a 3D image of a patient's femur, and a reference portion designing step S2 for designing a reference portion based on the shape of the femur in the 3D image. and an arm portion design step S3 for designing an arm portion connecting the guide portion and the reference portion (FIG. 4).

In the design method of the present invention, each part of the surgical aid is designed based on the 3D image of the patient's femur. A 3D image of a patient can be obtained by imaging with an X-ray machine, a magnetic resonance imaging (MRI) machine, a computed tomography (CT) machine. In the present invention, it is preferable to use an image picked up by a CT apparatus, since an image with a clear contour of the bone is used.

A patient's femoral head may be partially covered with cartilage, and when setting a contact area that matches the shape of the femoral head, it is necessary to specify the shape of the contact area by considering the shape of the cartilage as well. be. However, the intertrochanteric crest, neck, and pyriform fossa are not covered with cartilage, and images obtained by a simple X-ray device, CT scanner, or the like, which cannot detect cartilage, can be used appropriately. In other words, the design method of the present invention has the advantage that even if cartilage is not detected, any image that can identify the shape of the bone can be used.

In the guide portion designing step S1, a guide portion having a through hole is designed. The through hole guides the position and angle of the guide pin.
Although the shape of the guide portion is not particularly limited, it is preferably cylindrical.

In the reference part designing step S2, the reference part is designed based on the shapes of the intertrochanteric crest, the neck, and the pyriform fossa in the 3D image of the patient's femur. Specifically, reference portions are set for each region of the intertrochanteric crest, neck, and pyriform fossa, and the contact region in the present invention is designed so as to have a shape that matches the reference portions.
Regarding the set ranges of the contact areas of the intertrochanteric crest, the neck, and the pyriform fossa, the above description of (1) Surgery aid is used.

The contact area may be designed independently for the intertrochanteric crest, neck, and pyriform fossa, or multiple sites may be designed collectively. For example, a block (first block) containing a contact area (first area) for the intertrochanteric crest, a contact area (second area) for the neck, and a contact area (third area) for the pyriform fossa It is possible to adopt a form in which each block (second block) including the block is designed (see FIG. 1).

Next, in the arm portion designing step S3, an arm portion that connects the two parts is designed so that the guide portion and the reference portion are appropriately arranged. Specifically, when the surgical aid is fixed in accordance with the shape of the reference portion, the arm portion connects the guide portion and the reference portion so that the guide portion indicates the correct insertion position and angle of the guide pin.
The shape of the arm portion is not particularly limited and may be any shape, but it is preferable to have a three-dimensional shape with curved lines so that the arm portion does not come into contact with the femoral head.

In the design method of the present invention, the work order of the guide portion designing step S1 and the reference portion designing step S2 is not limited. That is, the design method of the present invention may perform the arm designing step S3 after sequentially performing the guide designing step S1 and the reference designing step S2. The arm portion designing step S3 may be performed after performing the step S1 in order.

Moreover, the design method of the present invention may comprise a step of providing a fixed wire insertion hole for inserting a fixed wire in the reference portion. The fixed wire insertion holes can be provided at multiple locations in the reference part, and are preferably designed in the first area and the second area, respectively.

Also, in the design method of the present invention, preferably, a 3D image of the patient's femur is used to construct a 3D model on software to model the surgical aid. Modeling can be performed using existing computer aided design (CAD)/computer aided manufacturing (CAM)/computer aided engineering (CAE) software (for example, AUTODESK's FUSION360).
By constructing a 3D model and designing a surgical aid, it is possible to easily design a patient-specific surgical aid while simulating a surgical plan determined by the 3D model.

Embodiments of the invention using 3D models are described in detail below. Note that the basic operation of the software will be omitted as appropriate to the extent that it is not unclear.

First, in the guide portion designing step S1, a 3D model of the patient's proximal femur including the femoral head (hereinafter referred to as the femur model) is constructed.
Subsequently, using the obtained femoral model, an osteotomy plan for the femoral head at the time of surgery is determined and a guide portion is designed. For the design of the guide part, a 3D model is used to determine the osteotomy position and angle of the femoral head, and a model of the guide part (hereinafter referred to as the guide part model) that can reproduce the osteotomy position and angle is produced. done by

A specific design of the guide part model can be performed by the following procedure.
First, a cylindrical reamer model (hereinafter referred to as a cylindrical model) used for osteotomy of the femoral head is produced. Usually, an operator inserts a guide pin into a through hole provided in the center of the cylindrical reamer, and presses the cylindrical reamer against the femoral head according to the guidance of the guide pin to perform osteotomy. Therefore, the cylinder model is preferably designed to have the same diameter and the same location of the through hole as the cylinder reamer.
After creating the cylinder model, the position and angle of the cylinder reamer in the osteotomy of the femoral head are determined using the cylinder model and the femur model. At this time, the position and angle of the cylindrical model are determined by bringing the cylindrical model into contact with the femoral head of the femur model. After that, the cylindrical model is moved along the same central axis to a position away from the femoral head, and the diameter of the cylindrical model is adjusted to an arbitrary size to obtain a guide part model according to the present invention.
In this way, a cylindrical guide part model can be designed that has the same central axis as that of the cylindrical reamer.

Furthermore, a through-hole for inserting a guide pin is made along the central axis of the guide part model so as to penetrate through the two bottom surfaces of the guide part model. The through-holes may be produced when the guide part model is produced, or may be produced after connecting the parts.

Next, in the reference part designing step S2, a reference part model (hereinafter referred to as a reference part model) having a contact area that contacts the femur is designed. In this embodiment of creating a 3D model, a block (first block) containing the contact area (first area) for the intertrochanteric crest and a contact area (second area) for the neck and for the pyriform fossa A two-block structure comprising a block (second block) containing the contact area (third area) is preferred.

Specifically, first, a first block model and a second block model set to a predetermined size are produced, and the block models are placed at appropriate positions on the femur model. After that, in each block model, by cutting out an unnecessary portion along the shape of the femur model for the contact portion with the femur model, a block model having a contact area having a patient-specific shape can be produced. .
By dividing the design into two blocks in this manner, the contact areas of the three points can be quickly determined, and the reference portion can be easily designed.

The detailed description of the set positions of the respective areas of the contact area is referred to the description of (1) Surgery assisting device.

Next, in the arm part designing step S3, the arms are designed to connect between the guide part model fixed at the appropriate position and angle on the upper part of the femoral head and the reference part model fixed at the appropriate position of the femoral model. A model of the arm (hereinafter referred to as an arm model) is arranged. After arranging the arm model, the guide model, the reference model, and the arm model are combined to produce an integrated model.

By creating a 3D model and designing the surgical aid as described above, it is possible to easily determine the positions of the guide part and the reference part. Able to design surgical aids.

(3) Manufacturing method of surgical aid The present invention also relates to a manufacturing method of the surgical aid 1 (hereinafter simply referred to as manufacturing method).
The manufacturing method of the present invention includes a guide portion designing step S1 for designing a guide portion based on a 3D image of a patient's femur, and a reference portion designing step S2 for designing a reference portion based on the shape of the femur in the 3D image. and an arm portion design step S3 for designing an arm portion connecting the guide portion and the reference portion, wherein the reference portion is designed based on the shape of the intertrochanteric crest, neck, and pyriform fossa in the 3D image. be.

In the manufacturing method of the present invention, the surgical aid can be manufactured using the design data obtained by the method (2) for designing the surgical aid. The surgical aid according to the present invention can be manufactured using a mold manufactured based on the obtained design data, or can be manufactured by a three-dimensional additive manufacturing method after preparing 3D design data. .
In the present invention, it is preferable to manufacture a surgical aid by a three-dimensional layered manufacturing method using a 3D printer or the like.

The manufacturing method using a 3D printer can adopt an existing manufacturing method, but for example, after converting the obtained 3D design data into an appropriate file format (STL file etc.), existing slice software etc. A three-dimensional solid shape can be formed by creating a slice file for printing using it and reading the slice file into a 3D printer.

The manufacturing method used in the manufacturing method of the present invention is not particularly limited, and for example, an FDM (Fused Deposition Modeling) method, a stereolithography method, a material injection method, a powder bonding method, or the like can be appropriately selected. In addition, the raw material used for three-dimensional layered manufacturing is not particularly limited, and existing thermosetting resins, photocurable resins, and the like can be used.
In the present invention, it is preferable to shape the surgical aid as a whole by a stereolithography method using a photo-curing resin or an FDM method, considering that it is easy to obtain and excellent in molding processability.

According to the production method of the present invention, a patient-specific surgical aid can be produced simply and easily.

For the specific design method of the surgical aid according to the manufacturing method of the present invention, the descriptions of (1) the surgical aid and (2) the design method of the surgical aid are used.

INDUSTRIAL APPLICABILITY The present invention can be applied to medical instruments such as artificial hip joint replacement surgery and the manufacture thereof.

1 surgical aid 2 guide part 21 through hole 3 reference part 31 first block 311 first area 311a fixing wire insertion hole 32 second block 321 second area 321a fixing wire insertion hole 322 third area 4 Arm 5 Proximal Femur 51 Femoral Head 52 Neck 53 Intertrochanteric Ridge 531 Center of Intertrochanteric Ridge 54 Piriform Fossa 55 Greater Trochanter 56 Lesser Trochanter L Overall Length of Intertrochanteric Ridge S1 Guide Part Design Process S2 Reference Part design process S3 Arm part design process

Claims (6)

A surgical aid used in surface replacement type artificial hip joint surgery,
a guide portion having a through hole for inserting the guide pin;
a reference portion having a contact area designed to match the shape of a patient-specific portion of the femur;
an arm portion connecting the guide portion and the reference portion;
with
The guide part determines the insertion position and angle of the guide pin into the femoral head,
The contact area has a first area that conforms to the shape of the intertrochanteric crest and is designed to cover the ridge of the intertrochanteric crest and a second area that conforms to the shape of the neck of the femur. and a third area conforming to the shape of a pyriform fossa located between the intertrochanteric crest and the neck. The first area conforms to a shape ranging from 1/4 to 1/2 of the total length of the intertrochanteric ridge extending over the greater trochanter and the lesser trochanter, including the central portion of the intertrochanteric ridge. , The surgical aid according to claim 1. The reference part has a plurality of fixed wire insertion holes for inserting fixed wires,
The surgical aid according to claim 1 or 2, wherein one or more fixing wire insertion holes are provided in each of the first area and the second area. The surgical aid according to any one of claims 1 to 3, wherein the guide part is provided so as to be spaced apart from the femoral head. A method for designing a surgical aid according to any one of claims 1 to 4,
a guide portion designing step of determining an insertion position and angle of a guide pin to be inserted into the femoral head based on a 3D image of the patient's femur and designing the guide portion;
a reference part designing step of designing the reference part based on the shapes of the intertrochanteric crest, neck, and pyriform fossa in the 3D image;
and designing the arm portion connecting the guide portion and the reference portion. A method for manufacturing the surgical aid according to any one of claims 1 to 4,
a guide portion designing step of determining an insertion position and angle of a guide pin to be inserted into the femoral head based on a 3D image of the patient's femur and designing the guide portion;
a reference part designing step of designing the reference part based on the shapes of the intertrochanteric crest, neck, and pyriform fossa in the 3D image;
and designing the arm portion connecting the guide portion and the reference portion.

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