CN118526325A - Individualized ear-shaped surface fitting type half pelvis reconstruction prosthesis based on electric knife sacroiliac separation - Google Patents

Abstract

The invention discloses a personalized ear-shaped surface fitting hemipelvic reconstruction prosthesis based on electrosurgical sacroiliac separation, the prosthesis comprising a first fixing element and a second fixing element; the first fixing element is a sacroiliac joint surface prosthesis, which matches the sacral ear-shaped surface; the second fixing element is an anti-dislocation hip joint acetabulum prosthesis, which is connected to an artificial femoral head prosthesis; the sacroiliac joint surface prosthesis comprises a connecting portion, a sacral ear-shaped surface contact portion, a sacral support and a flank structure, and all structures are integrally formed; the connecting portion is located at the middle and lower part of the sacroiliac joint surface prosthesis, and is connected to the anti-dislocation hip joint acetabulum prosthesis; the sacral ear-shaped surface contact portion is located at the inner side of the upper part of the sacroiliac joint surface prosthesis, and cooperates with the sacroiliac fracture surface; the sacral support is arranged at the lower part of the sacral ear-shaped surface contact portion; the flank structure is located at the outer side of the upper part of the sacroiliac joint surface prosthesis, and is used to fix the gluteus maximus and its fascia. The prosthesis of the invention is conducive to reducing postoperative complications and can improve the function of the affected limb.

Description

Personalized ear-shaped surface-fitting hemipelvic reconstruction prosthesis based on electrosurgical sacroiliac dissection

Technical Field

The present invention relates to the field of medical prosthesis, and more specifically to a personalized ear-shaped surface fitting hemipelvic reconstruction prosthesis based on electrosurgery sacroiliac separation

Background Art

Pelvic tumors are bone tumors that occur in the pelvis, including osteosarcoma, chondrosarcoma, Ewing's sarcoma, lymphoma, myeloma, metastatic cancer, etc. According to the Enneking classification, the resection and functional reconstruction of pelvic tumors can be divided into: Type I: iliac resection; Type II: acetabular peri-resection; Type III: ischium and pubic resection; Type IV: resection involves the sacrum. For pelvic tumors involving the Enneking I+II+(III) zone, because the ilium and acetabulum are widely invaded by the tumor, large-scale bone resection is required, resulting in large-scale loss of surrounding bone, and it is difficult to fix the hemipelvic prosthesis used to reconstruct the pelvic ring structure. Therefore, how to reconstruct a stable internal hemipelvic structure after pelvic tumor resection is a major challenge facing orthopedic surgeons.

At present, the main methods of pelvic reconstruction include hemipelvic prosthesis, allogeneic hemipelvic bone, autologous tumor bone inactivation and replantation, and femoral head upward movement. Among them, artificial hemipelvic prosthesis reconstruction occupies a dominant position in pelvic reconstruction after tumor resection due to its good initial stability, easy-to-accept appearance, and relatively fast functional recovery. For patients with pelvic I+II+(III) resection, the artificial hemipelvic prosthesis commonly used in clinical practice mainly includes: modular prosthesis, 3D printed prosthesis, acetabular cup combined with screw rod fixation, etc. During tumor resection, ultrasonic bone knife or wire saw is often used for vertical osteotomy, and then the above prosthesis is fixed to the sacrum with screws to achieve internal hemipelvic reconstruction. However, the above reconstruction methods have the following three problems: (1) After vertical osteotomy, the prosthesis is installed, and the contact interface between the prosthesis and the sacrum is almost vertical, resulting in excessive screw shear stress, and a high rate of prosthesis loosening and end fracture after surgery. (2) After tumor resection in zone I+II+(III), bone markers are lost, making it difficult to determine the installation position of the prosthesis and to achieve in situ reconstruction of the acetabular rotation center during surgery. Currently, existing literature has confirmed that in situ reconstruction of the acetabular rotation center is beneficial to reducing the risk of postoperative prosthesis dislocation. (3) Currently, the prosthesis needs to be fixed to the sacrum with screws. The length and implantation direction of the screws depend only on the surgeon's personal habits and operating experience, which often leads to inaccurate implantation of the sacral screws, requiring repeated fluoroscopic adjustments, and may even break through the sacral canal or the anterior/posterior cortex of the sacrum, posing a potential risk of damaging blood vessels and nerves.

Therefore, it is of great significance to design a new type of personalized hemipelvic prosthesis for reconstruction after pelvic I+II+(III) zone tumor resection.

Summary of the invention

The purpose of the present invention is to provide a personalized ear-shaped surface fitting hemipelvic reconstruction prosthesis based on electrosurgical sacroiliac separation surgery, which is beneficial to reduce postoperative complications and improve the function of the affected limb. In the preparation process of the prosthesis, 3D printing technology is used to construct a prosthetic ear-shaped surface that can accurately match the sacral ear-shaped surface, and on this basis, the prosthetic acetabular cup is designed in the physiological position of the acetabulum, and the screw hole angle on the side of the prosthesis is directed toward the sacral vertebral body.

The technical solution adopted by the present invention to solve the technical problem is:

A personalized ear-shaped surface-fitting hemi-pelvic reconstruction prosthesis based on electrosurgical sacroiliac separation mainly includes a first fixing element and a second fixing element; the first fixing element is a sacroiliac joint surface prosthesis connected to the sacrum, and the second fixing element is an anti-dislocation hip joint acetabulum prosthesis connected to an artificial femoral head.

In the above technical solution, further, the first fixing element is a structure that matches the sacral ear surface, and the sacroiliac joint surface prosthesis includes a connecting portion connected to the anti-dislocation hip acetabulum prosthesis, a sacral ear surface contact portion, a sacral support and a side wing structure; and the connecting portion, the sacral ear surface contact portion, the sacral support and the side wing structure are integrally formed.

Further, in the first fixing element, the connecting portion is located in the lower middle part of the overall structure and is a cylindrical structure, and a slot hole is provided at the bottom of the cylindrical structure; a cylindrical clamping block is provided at the upper part of the anti-dislocation hip acetabulum prosthesis, and the cylindrical clamping block matches the slot hole, and the two cooperate to realize the connection between the sacroiliac joint surface prosthesis and the anti-dislocation hip acetabulum prosthesis (second fixing element);

Furthermore, in the first fixing element, the sacral ear-shaped surface contact portion is located inside the sacroiliac joint surface prosthesis, and is provided with a plurality of threaded holes that can conform to the biomechanical properties of normal human bone tissue, the through hole diameter range of the threaded hole is 4mm-8mm, and the countersunk hole diameter is 6mm-10mm; the threaded hole is used to pass the sacral screw, so that the prosthesis is connected and fixed to the sacrum, and the angle of the threaded hole and the length of the sacral screw designed before the operation can avoid the screw from being inserted into the sacral canal or damaging the adjacent blood vessels during the operation; further, the sacral ear-shaped surface contact portion is a bionic trabecular bone structure, and the contact portion It is funnel-shaped, which is highly matched with the sacroiliac fracture surface, and can effectively reduce the vertical shear force after surgery to improve the early installation stability of the prosthesis; preferably, the sacral ear-shaped surface contact part is a porous bionic structure constructed by 3D printing using Ti-6AI-4V alloy powder, which can provide sufficient friction and is conducive to bone ingrowth, promote bone integration, and increase the later stability of the prosthesis; the thickness of the sacral ear-shaped surface contact part is 50mm-200mm, the pore diameter is 200μm-800μm, the wire diameter is 500-600μm, and the porosity is 50%-80%.

Furthermore, in the first fixing element, the sacrum support is arranged at the lower part of the contact part of the sacrum ear surface, which can reduce the shear stress at the "prosthesis-sacrum" contact interface and provide strong support for the initial postoperative stability and early prosthesis load-bearing.

Furthermore, the combination of the sacral ear-shaped surface contact portion and the sacral support structure can achieve better early prosthesis stability and reduce early shear force.

Furthermore, in the first fixing element, the wing structure is a nearly semicircular structure integrally formed by extending outward from the upper outer part of the prosthesis, and is evenly provided with hole structures. The hole diameter ranges from 8mm to 12mm, which can fix the gluteus maximus and its fascia as needed, and is used for reconstruction of soft tissues such as the gluteus maximus.

Furthermore, a threaded hole is provided on the sacroiliac joint surface prosthesis, and the aperture range of the threaded hole is 4mm-8mm. The threaded hole is used to pass the universal nail, and one end of the lumbar-sacral connecting rod is fixed with the tail cap, and the other end of the lumbar-sacral connecting rod is connected to the lumbar vertebra through a lumbar screw to achieve lumbar fixation; preferably, the direction of the threaded hole is consistent with the normal bone biomechanical conduction direction, so as to reduce the shear force of the screw during and after the operation.

Furthermore, in the first fixation element, the sacral ear surface contact portion and the threaded hole on the first fixation element are respectively used to achieve "prosthesis-sacrum" fixation and lumbar-sacral fixation. The combined fixation of the two will achieve better immediate stability, reduce vertical shear stress, facilitate early partial weight-bearing walking for patients, and improve prognosis.

Furthermore, the second fixing element is a hemispherical acetabular structure.

Furthermore, the second fixing element, the acetabular cup prosthesis, is located at the lower end of the overall structure and connected to the artificial femoral head prosthesis; an ultra-radius double-action structure is adopted to effectively avoid dislocation of the liner; and a self-locking polyethylene buckle is used to prevent dislocation of the prosthetic ball head.

Furthermore, a group of short black lines (as marks, other forms may also be used) are respectively provided on the prosthesis connecting portion in the first fixing element and the hemispherical acetabulum prosthesis of the second fixing element. After alignment, the anti-dislocation hip acetabulum prosthesis can be preset with an anteversion angle of 15° and an abduction angle of 40°, which conform to the biomechanical functions of the human body; preferably, the anti-dislocation hip prosthesis is rotatable in design, and the anteversion angle can be adjusted as needed to increase the surgical tolerance.

By adopting the above technical scheme, the present invention can realize stable and accurate reconstruction of the sacrum-ilium-hip joint and restore the walking function of patients after pelvic tumor resection; in the tumor resection stage, different from the traditional clinical vertical osteotomy method using wire saw or ultrasonic bone knife, it is changed to osteotomy along the auricular surface of the sacrum through electric knife, which not only retains the subchondral bone, but also can better ensure the negative tumor resection margin through articular surface separation, and according to the personalized design of the sacroiliac joint contact surface and the auricular surface obtained by 3D printing, the funnel shape of the prosthesis is closely fitted with the auricular surface of the sacrum, which reduces the vertical shear force and realizes hip The mortar rotation center is reconstructed in situ; the bionic trabecular structure on it can realize the biological connection between the prosthesis and the sacroiliac joint, promote the growth of new bone, facilitate bone integration, and improve the stability of the prosthesis fixation in the later stage; the sacral support structure of the sacral ear surface contact part forms a support in the longitudinal level of the sacrum, which can further reduce the vertical shear force and provide a strong guarantee for the initial stability and early prosthesis load; considering the heterogeneity of individual patients, the present invention can design the direction and length of the sacral screw according to the actual needs of the patient, so that it matches the physiological structure of the patient's sacrum, reducing the risk of intraoperative damage to blood vessels and nerves. And use a universal screw to fix the lumbar sacral connecting rod as needed, and use the lumbar 5 pedicle screw for lumbar fixation, further reducing the shear stress, and reducing the incidence of postoperative broken screws and prosthesis loosening. It is also equipped with a rotatable acetabular prosthesis design. After aligning the black marked short line of the fixing connection and the hemispherical hip prosthesis, the acetabular prosthesis conforms to the anteversion and abduction angles of the normal biomechanical function of the human body, and the anteversion angle can be adjusted as needed to achieve a personalized customization plan; the connection part uses an embedded connection design, an anti-dislocation hip acetabular prosthesis super-radius double-action structure and a self-locking polyethylene buckle design to further strengthen the prosthesis connection, improve stability, and reduce the occurrence of postoperative prosthesis loosening.

The beneficial effects of the present invention are:

The traditional method uses an ultrasonic bone knife or a wire saw to perform vertical osteotomy on the sacrum, and then installs the prosthesis, which causes excessive shear force on the nearly vertical interface between the prosthesis and the sacrum, and the prosthesis is easy to loosen and break after surgery. In addition, the prosthesis installation position and sacral screw implantation direction are not accurate during the operation. The personalized 3D printed hemipelvic auricular surface prosthesis of the present invention has the following beneficial effects:

1. During the pelvic tumor resection stage, some patients' tumors do not involve the gluteus maximus and its surrounding soft tissues. After the tumor is completely removed, the above tissues are partially or completely preserved. The multi-hole structure reserved in the flank structure of the first fixing element of the ear-shaped surface fitting hemi-pelvic prosthesis of the present invention can fix the gluteus maximus and its fascia as needed, perform soft tissue reconstruction, and improve the muscle strength of the affected limb;

2. During the pelvic tumor resection stage, according to the different extent of tumor involvement in different patients, after osteotomy in zone II or zone III, the sacroiliac joint in zone I of the pelvis is then treated, and the ligaments connecting the sacroiliac joint are gradually removed using an electric knife to achieve joint dislocation. Considering that it is not easy for tumors to break through the joint surface during their occurrence and development, using this method to remove the tumor can better ensure that the tumor margin is negative, which is beneficial to reducing the local recurrence rate of postoperative tumors and improving oncological prognosis. At the same time, retaining subchondral bone plays an important role in the bone ingrowth of the bionic trabecular structure in the first fixation element of the prosthesis, increasing bone integration, and improving the stability of the late fixation of the prosthesis; traditional surgery uses a wire saw or ultrasonic bone knife to vertically cut the sacroiliac joint surface, causing subchondral bone loss, and cannot achieve the above effects.

3. At the same time, the sacroiliac joint is separated by electrosurgery, and the uneven structure of the sacral ear-shaped surface can be retained, so that the contact part of the ear-shaped surface of the first fixing element of the prosthesis can be completely fitted with the sacral ear-shaped surface, which is convenient for the precise placement of the prosthesis. The joint surface is an uneven funnel-shaped structure, which greatly reduces the vertical shear stress on the contact interface prosthesis and improves the stability of the early fixation of the prosthesis. In addition, the sacral support structure and the lumbar sacral connecting rod in the first fixing element can further reduce the shear force and reduce the occurrence of postoperative prosthesis breakage and loosening. Relying on the above-mentioned precise matching, the precise in situ reconstruction of the acetabulum rotation center can be achieved, effectively reducing the occurrence of postoperative acetabulum dislocation rate and improving patient prognosis. Traditional surgery uses a wire saw or an ultrasonic bone knife for vertical osteotomy, resulting in a nearly vertical osteotomy interface and a large shear force. In addition, the osteotomy interface is uncontrollable, the prosthesis cannot be accurately placed, and it is difficult to achieve in situ reconstruction of the rotation center.

4. When fixing the prosthesis to the sacrum, the hole structure of the contact part of the auricular surface of the sacrum has reserved a suitable direction according to the individual patient's situation when designing the prosthesis by 3D printing before surgery. It not only conforms to the normal biomechanical function of the human body, but also implants the sacral screws along the hole structure during surgery to a large extent to avoid the screws from penetrating the sacral foramen or the anterior/posterior cortical bone of the sacrum, effectively reducing the risk of screws damaging blood vessels and nerves. In addition, the hole structures of the other two groups conform to the biomechanical function of the human body.

5. The multiple fixation structures of the prosthesis increase the stability of the prosthesis: the funnel-shaped structure of the sacral auricular surface contact part and the single locking structure of the sacral support structure can better reduce the early shear force. In addition, the hole structure of the sacral auricular surface contact part and the first fixation element can realize the "prosthesis and sacrum" fixation and lumbar sacral fixation, forming a double locking structure of the prosthesis, and will achieve better early immediate stability, which is beneficial for the patient to walk with partial weight bearing in the early stage and improve the prognosis. The bionic trabecular structure of the sacral auricular surface contact part can increase the friction of the contact interface, promote the growth of new bone into the trabecular pores, promote bone integration, and increase the late stability of the prosthesis.

6. When fixing the prosthesis to the femur, align the two sets of black short lines on the connecting part of the first fixing element and the hemispherical acetabular cup prosthesis of the second fixing element. The anteversion angle of the anti-dislocation hip acetabular cup prosthesis can be preset to 15° and the abduction angle to 40°, and the anteversion angle may be adjusted as needed to conform to the biomechanical function of the human body and increase the surgical tolerance rate.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be further described below in conjunction with the accompanying drawings:

FIG. 1 is a schematic diagram of a decomposed structure of the present invention.

FIG. 2 is a second schematic diagram of the decomposed structure of the present invention.

FIG. 3 is a schematic diagram of the structure of the present invention.

FIG. 4 is a second schematic diagram of the structure of the present invention.

FIG. 5 is a schematic diagram of the front structure of the prosthesis of the present invention after installation.

FIG. 6 is a schematic diagram of the back structure of the prosthesis of the present invention after installation.

FIG. 7 is a schematic diagram of the front structure of the prosthesis sacrum after being fixed with screws of the present invention.

FIG. 8 is a schematic diagram of the back structure of the prosthetic lumbar vertebra after fixation with screws of the present invention.

FIG. 9 is a schematic diagram of the front structure of the prosthetic lumbar vertebra after fixation with screws of the present invention.

Among them, sacroiliac joint surface prosthesis 1, sacral support 101, sacral ear surface contact part 102, flank structure 103, anti-dislocation hip acetabulum prosthesis connection part 104, threaded hole a 105, threaded hole b 106, threaded hole c 107, black short line 108, anti-dislocation hip acetabulum prosthesis 2, sacrum 3, ilium 4, sacral screw 5, universal nail 6, lumbar sacral connecting rod 7, lumbar nail 8.

DETAILED DESCRIPTION

The present invention will be further described below in conjunction with the accompanying drawings.

A personalized ear-shaped surface fitting hemipelvic reconstruction prosthesis based on electrosurgical sacroiliac separation, as shown in Figures 1 to 9, includes a sacroiliac joint surface prosthesis 1 that matches the patient's sacroiliac joint and an anti-dislocation hip joint acetabulum prosthesis 2. The sacroiliac joint surface prosthesis 1 includes a sacroiliac joint sacral support 101, a sacral ear-shaped surface contact portion 102, a wing structure 103, and a connecting portion 104. All structures in the sacroiliac joint surface prosthesis 1 are integrally formed, which can achieve early stability of the prosthesis and increase the probability of bone integration. The sacral ear-shaped surface contact portion 102 is accurately and firmly combined with the bone structure through the surrounding edging structure, and is fixed with screws to complete the precise combination of the prosthesis contact surface and the bone surface. At the same time, the in-situ reconstruction of the pelvic rotation center can be achieved to enhance the stability of the prosthesis.

The hemipelvic prosthesis of the present invention is a three-dimensional data model of the pelvis reconstructed based on the thin-layer CT scan data of the patient's pelvis before surgery. The hemipelvic prosthesis is designed on a computer, and the articular surface of the prosthesis is basically in line with the anatomical auricular surface of the sacrum on the side of the pelvic tumor. The screw channel designed on the prosthesis for implantation into the sacrum can avoid damage to the nerves when the screw is implanted into the sacral canal or damage to the blood vessels when the screw is implanted in the front of the sacrum during surgery.

The support part of the sacroiliac joint surface prosthesis 1 of the present invention adopts a sacral support 101. The sacroiliac joint is a longitudinal plane, and the sacral support 101 is arranged at the lower part of the sacral ear-shaped surface contact part 102. After being fixed with a sacral screw that conforms to the biomechanical properties of normal human bone tissue, it is combined with the sacral ear-shaped surface contact part 102 to provide strong support for initial stability and early prosthesis load-bearing, and reconstruct the conduction of the lower limb force line, thereby achieving early recovery of the patient's walking function after pelvic tumor resection. Using an electric knife to cut the ligament and perform sacroiliac joint dislocation to separate the ilium can retain the subchondral bone, which plays an important role in maintaining the stability of the prosthesis fixation, and can ensure that the prosthesis is not easy to sink, further improving the stability of the prosthesis.

The shape of the sacral ear-shaped contact portion 102 is funnel-shaped, which is consistent with the cross-sectional surface of the human sacroiliac joint; the lower part of the connecting portion 104 is a cylindrical structure, which is used to connect with the anti-dislocation hip acetabulum prosthesis 2; the anti-dislocation hip acetabulum prosthesis 2 is a hemispherical acetabular socket structure.

The acetabulum rotation center of the hemi-pelvic prosthesis is designed to fit the acetabulum rotation center on the lesion side of the preoperative CT scan. The effective and unique fit between the prosthesis articular surface and the auricular surface of the sacrum ensures that the acetabulum of the hemi-pelvic prosthesis is located at the original acetabulum rotation center of the pelvis. The anti-dislocation hip acetabulum prosthesis 2 adopts an ultra-radius double-motion structure to effectively avoid liner dislocation, and a self-locking polyethylene buckle is used to prevent dislocation of the prosthesis ball head.

The lower end of the connecting portion 104 is provided with a slot hole extending upward from the lower surface thereof; the upper part of the anti-dislocation hip acetabulum prosthesis 2 is provided with a cylindrical block matching the slot hole.

The inner sacral ear-shaped surface contact portion 102 of the prosthesis is a 3D printed porous trabecular bone structure, which is helpful for bone ingrowth, promotes bone integration, and is beneficial to long-term prosthesis-bone interface healing.

The sacral ear-shaped surface contact portion 102 is provided with a plurality of threaded holes a105 that can conform to the normal bone biomechanical design; the flank structure 103 is provided with a plurality of threaded holes b106 that can conform to the normal bone biomechanical design, which can be used for soft tissue reconstruction such as gluteus maximus as needed; the sacroiliac joint surface prosthesis 1 (at the junction of the sacral ear-shaped surface contact portion 102 and the connecting portion 104) is also provided with a plurality of threaded holes c107 that can fix the universal nails 6 as needed, and the lumbar nails 8 are connected through the lumbar-sacral connecting rod 7 to achieve lumbar-sacral fixation.

The prosthesis is fixed on the sacrum by passing the sacral screw 5 through the threaded hole a105; the threaded hole c107 can be personalized and required to pass the universal nail 6, the universal nail 6 can be fixed to the lumbar vertebrae 7 and the lumbar screw 8 through the tail cap to achieve the connection between the prosthesis and the lumbar vertebra 5 (lumbar sacral fixation), the direction of the screw is in accordance with the normal bone biomechanical design, reducing the shear force of the screw and enhancing the firmness of the prosthesis after implantation.

The connecting portion 104 of the sacroiliac joint surface prosthesis 1 and the anti-dislocation hip acetabulum prosthesis 2 are provided with a group of alignable black short lines 109, after which the anteversion angle and abduction angle of the anti-dislocation hip acetabulum prosthesis 2 can be preset to be 15° and 40° respectively, which fits the biomechanical function of the human body.

Each structure in the sacroiliac joint surface prosthesis 1 is integrally formed. The above structure is designed through computer mechanics analysis and can be integrally formed through 3D printing technology.

The anti-dislocation hip acetabulum prosthesis of the present application can achieve precise placement of the prosthesis, allowing the acetabulum to be centrally reconstructed in its physiological anatomical position, while reducing the risk of sacral screw implantation during surgery, lowering the incidence of postoperative prosthesis loosening and screw breakage complications, and obtaining better hip joint function and early stability.

Claims (10)

1. A personalized ear-shaped surface fitting type half pelvis reconstruction prosthesis based on electrotome sacroiliac separation, which is characterized by comprising a first fixing element and a second fixing element; the first fixation element is a sacroiliac joint surface prosthesis that mates with a sacral auricular surface; the second fixing element is an anti-dislocation acetabular cup prosthesis and is connected with the artificial femoral head prosthesis;

The sacroiliac joint surface prosthesis comprises a connecting part, a sacrum ear-shaped surface contact part, a sacrum support and a flank structure, and all the structures are integrally formed; the connecting part is positioned at the middle lower part of the sacroiliac joint surface prosthesis and is connected with the dislocation preventing acetabular cup prosthesis; the sacrum ear-shaped surface contact part is positioned at the upper inner side of the sacroiliac joint surface prosthesis and matched with the sacroiliac separation surface; the sacrum support is arranged at the lower part of the contact part of the sacrum auricular surface; the flank structure is located on the upper outer side of the sacroiliac joint prosthesis for securing gluteus maximus and fascia thereof.

2. The personalized ear-shaped surface fitting half pelvis reconstruction prosthesis based on electrotome sacroiliac separation as in claim 1, wherein the connecting part is of a cylindrical structure, and a clamping slot hole is arranged at the bottom of the cylindrical structure; the upper part of the dislocation preventing acetabular cup prosthesis is provided with a cylindrical clamping block; the cylindrical clamping block is matched with the clamping groove hole, and the cylindrical clamping block and the clamping groove hole are matched to fix the first fixing element and the second fixing element.

3. The personalized ear-shaped surface fitting type half pelvis reconstruction prosthesis based on the electrotome sacroiliac separation method according to claim 1, wherein a plurality of threaded holes which conform to the biomechanical properties of normal bone tissues of human bodies are arranged on the contact part of the sacral ear-shaped surface, the diameter of the through hole of each threaded hole ranges from 4mm to 8mm, and the countersunk aperture ranges from 6mm to 10mm; the threaded hole is used for penetrating through a sacrum screw so as to enable the sacroiliac joint prosthesis to be fixedly connected with the sacrum; the angle of the threaded hole and the length of the sacral screw are designed to avoid intraoperative placement of the screw into the sacral canal or injury to adjacent vessels.

4. The personalized ear-like surface-conforming semi-pelvic reconstructive prosthesis based on electrotome-sacroiliac separation according to claim 3, wherein the sacral ear-like surface contact is of a biomimetic bone trabecular structure, funnel-shaped, and highly fitting the sacroiliac dislocation surface; the sacrum auricular surface contact part is a porous bionic structure which is specifically formed by 3D printing of Ti-6AI-4V alloy powder, the thickness of the porous bionic structure is 50mm-200mm, the pore diameter of the pore is 200 mu m-800 mu m, the wire diameter is 500-600 mu m, and the porosity is 50% -80%.

5. The personalized ear-like surface fitting half pelvic reconstruction prosthesis based on electrotome sacroiliac separation as defined in claim 1, wherein the side wing structure is a nearly semicircular structure with holes uniformly provided thereon, and the hole has a pore diameter ranging from 8mm to 12mm.

6. The personalized auricular face fitting half pelvic reconstruction prosthesis based on electrotome sacroiliac separation according to claim 1, wherein the sacroiliac joint surface prosthesis is further provided with a threaded hole, and the direction of the threaded hole is consistent with the biomechanical conduction direction of a normal bone; the screw holes are used for penetrating through the universal nails to fix one end of the lumbosacral connecting rod through the tail caps, and the other end of the lumbosacral connecting rod is connected with lumbar vertebrae through the lumbar nails to achieve lumbosacral fixation.

7. The personalized otologic fit semi-pelvic reconstruction prosthesis based on electrotome sacroiliac separation as defined in claim 1, wherein the dislocation preventing acetabular cup prosthesis is specifically a hemispherical acetabular socket structure.

8. The personalized ear-shaped surface fitting half pelvic reconstruction prosthesis based on electrotome sacroiliac separation as recited in claim 7, wherein the dislocation prevention acetabular cup prosthesis adopts a super-radius double-acting structure for avoiding liner dislocation, and simultaneously adopts a self-locking design polyethylene buckle for preventing prosthesis bulb dislocation.

9. The personalized ear-like surface fitting half pelvic reconstruction prosthesis based on electrotome sacroiliac separation as defined in claim 1, wherein the first and second fixation elements are provided with markers that, when aligned, provide an anteversion angle of 15 ° and an abduction angle of 40 °, to conform to the biomechanical function of the human body.

10. The personalized ear-surface-conforming semi-pelvic reconstruction prosthesis based on electrotome-sacroiliac separation according to claim 9 wherein rotating the first and second fixation elements relative to the marker adjusts the anteversion angle of the dislocation-preventing acetabular cup prosthesis, conforms to human biomechanical function and increases surgical tolerance.