Preparation method of 3D guide plate for elbow introversion osteotomy and reduction correction

Abstract

The invention relates to a manufacturing method of a medical auxiliary tool, in particular to a manufacturing method of a 3D guide plate for elbow introversion osteotomy and reduction correction. The method comprises the steps of modeling, determining an osteotomy surface, manufacturing an osteotomy reduction tool guide plate, manufacturing an osteotomy guide plate and manufacturing a positioning guide plate. By means of the guide plate sets, the accuracy of the osteotomy position and the osteotomy plane direction can be actively improved, meanwhile, osteotomy guide plate positioning guide needles are used, reset tool guide plates are reset marks and reset tools, osteotomy far-end and near-end reset is simpler and more accurate, the accuracy and success rate of an operation are improved, meanwhile, a pure outer side small incision is adopted, and the operation efficiency is improved. Operation wounds can be reduced, ankylosis of the elbow joint after an operation is reduced, and postoperative rapid rehabilitation and elbow joint function recovery of a patient are facilitated.

Description

Technical Field

[0001] The invention relates to a method for manufacturing a medical auxiliary tool, and in particular to a method for manufacturing a 3D guide plate for elbow varus osteotomy and reduction correction. Background Art

[0002] There are many conventional surgical treatments for correction of cubitus varus deformity, but poor reduction after fracture is prone to occur, resulting in serious sequelae; and the distal lateral closed wedge osteotomy of the humerus, as the most classic surgical solution for correction of cubitus varus deformity, is simple to operate, has few complications, and has significant effects, and is widely favored by doctors, but there are still many problems during the operation: for example, there is a lack of quantitative standards for osteotomy angles. During the osteotomy process, many doctors often perform osteotomies based on their own experience. The osteotomy angle is prone to being too large or too small, and multiple osteotomy adjustments are often required to achieve the required angle, which greatly prolongs the operation time and increases the pain of the child; the postoperative aesthetics is poor, the distal osteotomy line is longer than the proximal osteotomy line, and after closing the osteotomy end, there is often a large step on the lateral side of the distal humerus. After the operation, the lateral condyle is obviously raised, which affects the postoperative aesthetics to a certain extent; the distal humeral anteversion angle is difficult to restore, and most children with cubitus varus have changes in the distal humeral anteversion angle, resulting in hyperextension deformity of the elbow joint in the children, which has not been solved in previous lateral closed wedge osteotomies. Summary of the invention

[0003] In view of the above technical problems, in order to greatly improve the surgical accuracy and efficiency of elbow varus osteotomy correction, the present invention manufactures a reduction tool guide, an osteotomy guide and a positioning guide before surgery. That is, the present invention provides a method for preparing a 3D guide for elbow varus osteotomy and reduction correction.

[0004] In order to solve the above technical problems, the technical solution provided by the present invention is: a method for preparing a 3D guide plate for elbow varus osteotomy and reduction correction, comprising the following steps:

[0005] A method for preparing a 3D guide plate for elbow varus osteotomy and reduction correction comprises the following steps:

[0006] A. Modeling: Input the CT scan data of the affected and healthy sides into the 3D software to obtain the full-length 3D models of the affected and healthy sides, referred to as the affected side model and the healthy side model; the healthy side model is mirrored to produce the full-length 3D model of the normal humerus of the "affected side", referred to as the corrected model;

[0007] B. Confirm the osteotomy surface: Move and rotate the affected-side mold and the corrected mold, overlap the proximal ends of the affected-side mold and the corrected mold, obtain the deformity comparison between the affected and healthy sides, make a cut perpendicular to the humeral axis at 0.9-1.1cm above the olecranon fossa and at the deformity vertex as the first osteotomy surface, and cut the affected-side mold and the corrected mold with the first osteotomy surface; compare the affected-side mold, move and rotate the cut distal end of the corrected mold to overlap with the distal articular surface of the affected-side mold, and use the excess part of the affected-side mold osteotomy distal end compared to the corrected mold osteotomy distal end as the second osteotomy surface; obtain the ideal affected-side humerus distal end after the second osteotomy;

[0008] C. Making osteotomy reduction tool guide: After fitting and reducing the distal end of the affected side humerus obtained by two osteotomies with the proximal end of the affected side humerus, place a total of 4 parallel and coplanar guide pins with the same spacing above and below the first osteotomy surface, and make the reduction tool guide according to the 4 guide pins and their positions;

[0009] D. Making osteotomy guide: Use the first osteotomy surface to separate the reduction tool guide, and at the same time, separate and move the distal and proximal ends of the osteotomy of the affected side humerus to restore the state before osteotomy. At this time, the accurate first osteotomy surface and the second osteotomy surface can be obtained, and the osteotomy plane and direction of the osteotomy guide are made with the two osteotomy surfaces, which are respectively connected with the upper and lower separated reduction tool guides to form an integral whole, and the upper and lower parts are connected with a connecting rod to achieve the effect of strengthening the structural stability, and a complete osteotomy guide matching the outer side of the distal humerus and close to the bone is obtained through the brute force calculation;

[0010] E. Make a positioning guide: Make a positioning guide according to the guide needle in step C.

[0011] Further: In the above-mentioned method for preparing a 3D guide plate for elbow varus osteotomy and reduction correction, during modeling in step A, the full-length 3D model of the affected humerus is in a 1:1 ratio with the affected side; the full-length 3D model of the healthy side humerus is also in a 1:1 ratio with the healthy side.

[0012] The spacing between the coplanar guide pins in step C is determined according to the patient's bone size, and the coplanar guide pins are located on the median coronal plane of the lateral side of the humerus, and the midpoints of the two middle guide pins are the osteotomy plane. Preferably, the spacing between the coplanar guide pins is set to 8 mm, and the guide pin diameter is 2.0 mm.

[0013] The step C is to use Mimics software to make a reduction tool guide, which is used for reduction or temporary fixation after osteotomy.

[0014] The two Kirschner wires at the proximal end of the first osteotomy surface of the osteotomy guide in step D serve as proximal positioning guide wires of the osteotomy guide.

[0015] The positioning guide plate of step E is designed and manufactured based on the positioning guide needle of step D through layout calculation.

[0016] The reduction tool guide plate, osteotomy guide plate, and positioning guide plate are all printed out by a three-dimensional printer before the operation.

[0017] Compared with the prior art, a combined guide plate method is used, i.e., a reduction tool guide plate, an osteotomy guide plate and a positioning guide plate are combined. The positioning guide plate is small and simple, and a simple lateral small incision can meet the clinical surgical requirements, thereby realizing precise positioning of the positioning guide plate, and then realizing precise positioning of the osteotomy guide plate by using a guide pin for precise positioning, thereby actively improving the accuracy of the osteotomy site and the direction of the osteotomy plane; finally, by using the osteotomy guide plate to position the guide pin, the reduction tool guide plate is a reduction mark and a reduction tool, making the distal and proximal reduction of the osteotomy simpler and more accurate, and realizing accurate reduction from osteotomy to reduction, which is different from the prior art in which a simple osteotomy guide plate only realizes precise osteotomy, but the reduction and fixation after osteotomy need to rely solely on the clinical experience of the physician. Therefore, the present technology can improve the accuracy and success rate of the operation, and at the same time can reduce the surgical incision, and realize the completion of the operation with a simple lateral small incision, which can greatly reduce the surgical trauma, reduce the stiffness of the elbow joint after surgery, and facilitate the patient's rapid recovery and recovery of elbow joint function after surgery. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further explained below.

[0019] Embodiment 1:

[0020] Patient 1: A 12-year-old female presented with left cubital varus deformity 8 months after conservative treatment of left supracondylar humeral fracture.

[0021] 1. CT scan and reconstruction of the entire humerus on the affected and healthy sides

[0022] When the patient is admitted to the hospital, the CT scan data of the affected side and the healthy side are first input into the 3D software (Mi imi cs software) to obtain the full-length 3D models of the affected side and the healthy side humerus, referred to as the affected side model and the healthy side model; the healthy side model is mirrored to make a full-length 3D model of the normal humerus of the "affected side", referred to as the corrected model; during modeling, the full-length 3D model of the affected side humerus is in a 1:1 ratio with the affected side; the full-length 3D model of the healthy side humerus is also in a 1:1 ratio with the healthy side.

[0023] 2. 3D printed guide design (including positioning guide, osteotomy guide and reduction tool guide combination)

[0024] 1. Confirm the two osteotomy planes of the affected humerus

[0025] Move and rotate the affected side mold and the corrected mold, overlap the proximal ends of the affected side mold and the corrected mold, obtain the deformity comparison between the affected side and the healthy side, make a cut perpendicular to the humeral axis 1 cm above the olecranon fossa and on the deformity vertex as the first osteotomy surface, and cut the affected side mold and the corrected mold with the first osteotomy surface; compare the affected side mold, move and rotate the cut distal end of the corrected mold to overlap with the distal articular surface of the affected side mold, and use the excess part of the osteotomy distal end of the affected side mold compared to the osteotomy distal end of the corrected mold as the second osteotomy surface; obtain the ideal affected side humerus distal end after the second osteotomy;

[0026] 2. Design and production of reset tool guide

[0027] After fitting and reducing the distal end of the affected-side humerus obtained by two osteotomies and the proximal end of the affected-side humerus, two guide pins perpendicular to the median axis of the humerus and with the same spacing, all 8 mm and parallel and coplanar, were placed on the upper and lower sides of the first osteotomy surface. The guide pins had a diameter of 2 mm and were all located on the median coronal plane of the lateral side of the humerus. The midpoints of the two middle guide pins were the osteotomy surface. The thickness and spacing of the guide pins could be determined according to the thickness of the patient's humeral bone. Mimics was used to make a reduction tool guide based on the thickness and position of the four guide pins. The tool guide could be used for reduction and temporary fixation after osteotomy.

[0028] 3. Design and production of osteotomy guide

[0029] The reduction tool guide was cut off at the first osteotomy surface using the Mimics software, and the distal and proximal ends of the affected side humeral osteotomy were separated and moved to restore the state before osteotomy. At this time, the first osteotomy surface, i.e., the osteotomy surface and the second osteotomy surface perpendicular to the humerus, were accurately obtained. The osteotomy plane and direction of the osteotomy guide were made with the two osteotomy surfaces, and they were connected and integrated with the upper and lower separated reduction tool guides, and the upper and lower parts were connected with a connecting rod to achieve the effect of strengthening the structural stability. After the brute force calculation, a complete osteotomy guide matching the outer side of the distal end of the humerus was obtained. The two Kirschner wires at the proximal end of the first osteotomy surface were used as the proximal positioning guide pins of the osteotomy guide.

[0030] 4. Design and production of positioning guide plate:

[0031] The two Kirschner wires at the proximal end of the first osteotomy surface were used as the "positioning guide wires" at the proximal end of the osteotomy guide using Mini cs software, and a small bone-fitting positioning guide matching the lateral side of the distal humerus was designed and manufactured through Boucher calculation.

[0032] 5. The designed reduction tool guide, osteotomy guide, and positioning guide are respectively imported into the 3D printer for printing (PLA material) to obtain 3D printed reduction tool guide, osteotomy guide, and positioning guide, and are sterilized with plasma before surgery for use.

[0033] 3. Surgical techniques and procedures

[0034] 1. Preoperative X-rays showed obvious cubital varus deformity of the left upper limb. Preoperative appearance photos compared with the healthy side showed obvious left elbow varus deformity, and the surgical indications were clear; the patient was in a supine position, and the left upper limb was routinely disinfected and covered with a towel, and a sterile tourniquet was applied to the upper limb.

[0035] 2. Make an 8-cm incision on the lateral side of the distal humerus. After cutting the skin and fascia, enter from the gap between the triceps and brachialis without stripping the periosteum. Fit the positioning guide completely to the lateral bone surface of the distal humerus. Insert two 2mm Kirschner wires according to the guide holes of the positioning guide to obtain the positioning point of the osteotomy guide. Remove the positioning guide, insert the two 2mm positioning Kirschner wires into the proximal guide holes of the 3D printed osteotomy guide and fit it to the lateral bone surface of the distal humerus. Then insert two 2mm Kirschner wires through the other two positioning guide pin holes below the osteotomy guide to fix the osteotomy guide.

[0036] 3. Use an oscillating saw to perform osteotomy according to the osteotomy surface guide hole designed on the osteotomy guide plate. First cut off the upper osteotomy surface and then cut off the lower osteotomy surface. After removing the osteotomy, perform reduction.

[0037] 4. Use 4 fixed Kirschner wire guides as reduction reference marks. When the four guide wires are parallel and all in the middle of the lateral surface of the humerus, ideal reduction conditions can be obtained. Use the reduction tool guide to insert the 4 Kirschner wires into the 4 corresponding Kirschner wire guide holes of the reduction tool guide for reduction and temporary fixation. Then use 3 Kirschner wires to cross-fix the distal and proximal ends of the osteotomy. Remove the reduction tool guide and the 4 Kirschner wire guides on the guide, and fix them with the distal lateral humeral plate. C-arm fluoroscopy confirms that the osteotomy is well reduced, the internal fixation position and screw length are appropriate, and the osteotomy correction effect is completely consistent with the preoperative 3D design. Keep a temporary fixed medial Kirschner wire. During the operation, the elbow varus deformity has been restored.

[0038] 5. Clean the surgical incision and suture it.

[0039] IV. Postoperative treatment

[0040] Routine postoperative treatment was performed, with the use of preventive antibiotics for 24 hours. Postoperative X-rays were reviewed on the second day after surgery, showing that the varus deformity was completely corrected, which was consistent with the preoperative plan. The appearance of the elbow joint of the affected limb was the same as that of the affected side after surgery. Upper limb muscle and joint function exercises were started on the second day after surgery. The sutures were removed from the surgical site 2 weeks after surgery. The medial Kirschner wire was removed 2 months after surgery based on the review of X-rays and fracture healing. 2 months after surgery, partial bone healing was seen at the osteotomy site. 12 months after surgery, the function and appearance were well restored, the osteotomy site was completely healed, and the internal fixation plate was removed. The Mayor elbow score was 95 points, and there were no complaints of other discomfort. The Mayo elbow function score, also known as the Morey and Bryan score, is widely used in the evaluation of elbow function.

[0041] Example 2

[0042] Patient 2: Male, 37 years old, was admitted to the hospital due to "elbow varus deformity for more than 20 years after supracondylar fracture of the left humerus". More than 20 years ago, he suffered from pain in his left elbow and limited movement due to trauma. At that time, he was diagnosed with supracondylar fracture of the left humerus. He was treated in a local hospital at that time. The local doctor performed manual reduction and plaster external fixation. After the fracture healed, elbow varus deformity gradually appeared. The deformity gradually worsened in the future, and the elbow joint movement was still acceptable. He was treated in our hospital, and the left elbow joint anteroposterior and lateral films showed: varus changes in the left elbow joint. With the diagnosis of "delayed varus deformity after bone healing of supracondylar fracture of the left humerus", he was admitted to the hospital for correction of elbow varus deformity.

[0043] 1. CT scan and reconstruction of the entire humerus on the affected and healthy sides

[0044] When the patient is admitted to the hospital, the CT scan data of the affected side and the healthy side are first input into the 3D software (Mi imi cs software) to obtain the full-length 3D models of the affected side and the healthy side humerus, referred to as the affected side model and the healthy side model; the healthy side model is mirrored to make a full-length 3D model of the normal humerus of the "affected side", referred to as the corrected model; during modeling, the full-length 3D model of the affected side humerus is in a 1:1 ratio with the affected side; the full-length 3D model of the healthy side humerus is also in a 1:1 ratio with the healthy side.

[0045] 2. 3D printed guide design (including positioning guide, osteotomy guide and reduction tool guide combination)

[0046] 1. Confirm the two osteotomy planes of the affected humerus

[0047] Move and rotate the affected side mold and the corrected mold, overlap the proximal ends of the affected side mold and the corrected mold, obtain the deformity comparison between the affected side and the healthy side, make a cut perpendicular to the humeral axis 1 cm above the olecranon fossa and on the deformity vertex as the first osteotomy surface, and cut the affected side mold and the corrected mold with the first osteotomy surface; compare the affected side mold, move and rotate the cut distal end of the corrected mold to overlap with the distal articular surface of the affected side mold, and use the excess part of the osteotomy distal end of the affected side mold compared to the osteotomy distal end of the corrected mold as the second osteotomy surface; obtain the ideal affected side humerus distal end after the second osteotomy;

[0048] 2. Design and production of reset tool guide

[0049] After fitting and reducing the distal end of the affected-side humerus obtained by two osteotomies and the proximal end of the affected-side humerus, two guide pins perpendicular to the median axis of the humerus and with the same spacing, all 8 mm and parallel and coplanar, were placed on the upper and lower sides of the first osteotomy surface. The guide pins had a diameter of 2 mm and were all located on the median coronal plane of the lateral side of the humerus. The midpoints of the two middle guide pins were the osteotomy surface. The thickness and spacing of the guide pins could be determined according to the thickness of the patient's humeral bone. Mimics was used to make a reduction tool guide based on the thickness and position of the four guide pins. The tool guide could be used for reduction and temporary fixation after osteotomy.

[0050] 3. Design and production of osteotomy guide

[0051] The reduction tool guide was cut off at the first osteotomy surface using the Mimics software, and the distal and proximal ends of the affected side humeral osteotomy were separated and moved to restore the state before osteotomy. At this time, the first osteotomy surface, i.e., the osteotomy surface and the second osteotomy surface perpendicular to the humerus, were accurately obtained. The osteotomy plane and direction of the osteotomy guide were made with the two osteotomy surfaces, and they were connected and integrated with the upper and lower separated reduction tool guides, and the upper and lower parts were connected with a connecting rod to achieve the effect of strengthening the structural stability. After the brute force calculation, a complete osteotomy guide matching the outer side of the distal end of the humerus was obtained. The two Kirschner wires at the proximal end of the first osteotomy surface were used as the proximal positioning guide pins of the osteotomy guide.

[0052] 4. Design and production of positioning guide plate:

[0053] Mimics software was used to design and manufacture a small bone-fitting positioning guide that matched the outer side of the distal humerus based on the two Kirschner wires at the proximal end of the first osteotomy surface as the "positioning guides" at the proximal end of the osteotomy guide.

[0054] 5. The designed reduction tool guide, osteotomy guide, and positioning guide are respectively imported into the 3D printer for printing (PLA material) to obtain 3D printed reduction tool guide, osteotomy guide, and positioning guide, and are sterilized with plasma before surgery for use.

[0055] 3. Surgical techniques and procedures

[0056] 1. Preoperative anteroposterior and lateral X-rays showed clear cubital varus deformity of the left upper limb, and the surgical indications were clear; the patient was in the supine position, and the left upper limb was routinely disinfected and covered with a drape, and a sterile tourniquet was applied to the upper limb.

[0057] Preoperative anteroposterior and lateral radiographs of the left elbow showed varus deformity of the left elbow.

[0058] 2. Make an 8-cm incision on the lateral side of the distal humerus. After cutting the skin and fascia, enter from the gap between the triceps and brachialis without stripping the periosteum. Fit the positioning guide completely to the lateral bone surface of the distal humerus. Insert two 2mm Kirschner wires according to the guide holes of the positioning guide to obtain the positioning point of the osteotomy guide. Remove the positioning guide, insert the two 2mm positioning Kirschner wires into the proximal guide holes of the 3D printed osteotomy guide and fit it to the lateral bone surface of the distal humerus. Then insert two 2mm Kirschner wires through the other two positioning guide pin holes below the osteotomy guide to fix the osteotomy guide.

[0059] 3. Use an oscillating saw to perform osteotomy according to the osteotomy surface guide hole designed on the osteotomy guide plate. First cut off the upper osteotomy surface and then cut off the lower osteotomy surface. After removing the osteotomy, perform reduction.

[0060] 4. Use 4 fixed Kirschner wire guides as reduction reference marks. When the four guide wires are parallel and all in the middle of the lateral surface of the humerus, ideal reduction conditions can be obtained. Use the reduction tool guide to insert the 4 Kirschner wires into the 4 corresponding Kirschner wire guide holes of the reduction tool guide for reduction and temporary fixation. Then use 3 Kirschner wires to cross-fix the proximal and distal ends of the osteotomy. Remove the reduction tool guide and the 4 Kirschner wire guides on the guide. Fix with the distal lateral humeral plate. C-arm fluoroscopy confirms that the osteotomy is well reduced, the internal fixation position and screw length are appropriate, and the osteotomy correction effect is completely consistent with the preoperative 3D design. Keep a temporary medial Kirschner wire. During the operation, the elbow varus deformity has been restored.

[0061] 5. Clean the surgical incision and suture it.

[0062] IV. Postoperative treatment

[0063] Routine postoperative treatment was performed, with preventive antibiotics for 24 hours. Postoperative X-rays were reviewed on the second day after surgery, showing that the varus deformity was completely corrected, which was consistent with the preoperative plan. The appearance of the elbow joint of the affected limb was the same as that of the affected side after surgery. Upper limb muscle and joint function exercises were started on the second day after surgery. The sutures were removed from the surgical site 2 weeks after surgery. The medial Kirschner wire was removed 2 months after surgery based on the review of X-rays and fracture healing. 2 months after surgery, partial bone healing was seen at the osteotomy site; 18 months after surgery, X-rays were reviewed, indicating that the osteotomy site was completely healed, and the function and appearance were well restored. 18 months after surgery, the internal fixation was removed, showing that the osteotomy correction site had completely healed, and the internal fixation plate was removed. The Mayor elbow score was 90 points, and there were no complaints of other discomfort.

Claims

1. A method for preparing a 3D guide plate for elbow varus osteotomy and reduction correction, characterized in that: The following steps are included: A. Modeling: Input the CT scan data of the affected and healthy sides into the 3D software to obtain the full-length 3D models of the affected and healthy sides, referred to as the affected side model and the healthy side model; the healthy side model is mirrored to produce the full-length 3D model of the normal humerus of the "affected side", referred to as the corrected model; B. Confirm the osteotomy surface: Move and rotate the affected-side mold and the corrected mold, overlap the proximal ends of the affected-side mold and the corrected mold, obtain the deformity comparison between the affected and healthy sides, make a cut perpendicular to the humeral axis at 0.9-1.1cm above the olecranon fossa and at the deformity vertex as the first osteotomy surface, and cut the affected-side mold and the corrected mold with the first osteotomy surface; compare the affected-side mold, move and rotate the cut distal end of the corrected mold to overlap with the distal articular surface of the affected-side mold, and use the excess part of the affected-side mold osteotomy distal end compared to the corrected mold osteotomy distal end as the second osteotomy surface; obtain the ideal affected-side mold distal end of the humerus after the second osteotomy; C. Making osteotomy reduction tool guide: After fitting and reducing the distal end of the affected side humerus obtained by two osteotomies with the proximal end of the affected side humerus, place a total of 4 parallel and coplanar guide pins with the same spacing above and below the first osteotomy surface, and make the reduction tool guide according to the 4 guide pins and their positions; D. Making an osteotomy guide: Use the first osteotomy surface to separate the reduction tool guide, and at the same time, separate the distal and proximal ends of the osteotomy of the affected side humerus and move them to restore the state before osteotomy. At this time, the first osteotomy surface and the second osteotomy surface can be obtained, and the osteotomy plane and direction of the osteotomy guide are made with the two osteotomy surfaces, and are connected to the upper and lower separated reduction tool guides as a whole, and the upper and lower parts are connected with a connecting rod. After the brute force operation, an osteotomy guide that matches the outer side of the distal humerus and is close to the bone is obtained; E. Make a positioning guide: Make a positioning guide according to the guide needle in step C.

2. The method for preparing a 3D guide plate for elbow varus osteotomy and reduction correction according to claim 1, characterized in that: During the modeling in step A, the full-length 3D model of the affected humerus is in a 1:1 ratio with the affected side; the full-length 3D model of the healthy side humerus is also in a 1:1 ratio with the healthy side.

3. The method for preparing the 3D guide plate for cubitus varus osteotomy correction according to claim 2, characterized in that: The spacing between the coplanar guide pins in step C is determined according to the patient's bone size. The coplanar guide pins are located on the median coronal plane of the lateral side of the humerus, and the midpoints of the two middle guide pins are the osteotomy plane.

4. The method for preparing a 3D guide plate for cubitus varus osteotomy and reduction correction according to claim 3, characterized in that: The spacing between coplanar guide pins was set to 8 mm, and the diameter of the guide pins was 2.0 mm.

5. The method for preparing a 3D guide plate for cubitus varus osteotomy and reduction correction according to claim 4, characterized in that: The step C is to use Mimics software to make a reduction tool guide, which is used for reduction or temporary fixation after osteotomy.

6. The method for preparing a 3D guide plate for cubitus varus osteotomy and reduction correction according to claim 5, characterized in that: The two Kirschner wires at the proximal end of the first osteotomy surface of the osteotomy guide in step D serve as proximal positioning guide wires of the osteotomy guide.

7. The method for preparing a 3D guide plate for cubitus varus osteotomy and reduction correction according to claim 6, characterized in that: The positioning guide plate of step E is designed and manufactured based on the positioning guide needle of step D through layout calculation.

8. The method for preparing a 3D guide plate for cubitus varus osteotomy and reduction correction according to any one of claims 1 to 7, characterized in that: The reduction tool guide plate, osteotomy guide plate, and positioning guide plate are all printed out by a three-dimensional printer before the operation.