CN212308138U - Keep children type tumour joint prosthesis of thighbone neck and knee articular surface - Google Patents

Abstract

The utility model provides a children tumor joint prosthesis for keeping femoral neck and knee joint surfaces, which comprises a backbone extension section, wherein two ends of the backbone extension section are respectively matched and connected with a proximal femoral prosthesis and a distal femoral prosthesis; the joint surface of the proximal femur prosthesis and the femur and the joint surface of the distal femur prosthesis and the femoral condyle are both provided with a groove with a bone trabecula porous structure; the outer side of the distal femur prosthesis is detachably connected with an outer femur steel plate; the proximal femur central tension nail and the proximal femur auxiliary nail are connected with the proximal femur prosthesis and the femur, and the locking nail and the cancellous bone tension nail are connected with the distal femur prosthesis and the femoral condyle. The prosthesis is connected with metaphysis tissues of the upper femur and the distal femur, and the bone growth function of the child patient is reserved. The bone growth of the child patient after operation is not limited by the steel plate, the steel plate on the outer side of the femur can be removed after the prosthesis and the bone tissue form firm biological fixation, and the stability and the reliability of the prosthesis are further improved by utilizing the cancellous bone tension nail.

Description

Keep children type tumour joint prosthesis of thighbone neck and knee articular surface

Technical Field

The utility model relates to the technical field of artificial prosthesis devices, in particular to a children tumor joint prosthesis which keeps the joint surfaces of a femur neck and a knee.

Background

Primary and secondary malignant bone tumors are motor system neoplastic lesions that severely threaten the survival and quality of life of patients. With the development of surgical operation technology, the innovation of tumor imaging technology and the development of new adjuvant chemotherapy for patients with malignant tumor, limb protection surgery has become a consensus for treating malignant bone tumor. Malignant tumors occurring in the long diaphysis of limbs need to follow the principle of extensive resection in clinic, so the reconstruction of diaphyseal defects after tumor resection is of great concern, especially for children patients, children are good-developing populations of malignant bone tumors in recent years, and the common malignant tumors are osteosarcoma, ewing sarcoma and the like, and the tumors are often generated at the metaphysis (femoral metaphysis and tibial metaphysis) of the knee joint. After the operation replacement is carried out on the patients, the growth function of the affected limb is often influenced, the phenomena of unequal length of the left leg and the right leg, limping during walking and the like are caused after a long time, and a prolonged revision operation is needed in serious cases.

Currently, the most common reconstruction method is to use an extendable prosthesis to reconstruct a bone defect, but has the defects of multiple operations, large trauma to a patient (the traditional extendable prosthesis), high economic cost, limited extension distance and inaccurate long-term curative effect. In addition, some prostheses for retaining the joint surfaces are also provided, the inner side and the outer side of the distal femur of the prostheses are fixed by steel plates, and the steel plate encircling structure at the two sides has the problems of clinical feedback of swelling and pain around the joints after operation, limitation of knee bending and difficult suture of large steel plate volume in the operation.

SUMMERY OF THE UTILITY MODEL

The utility model provides a remain children type tumour joint prosthesis of femoral neck and knee articular surface, current thighbone reconstruction method has following problem, and the wound that the patient receives is great (the tradition can prolong formula prosthesis), and economic cost is higher, and long-term curative effect is uncertain, installs the steel sheet in the thighbone distal end outside can arouse that clinical feedback joint is swelling, painful around the postoperative, the limited and big problem of difficult sewing up of intraoperative steel sheet of bending the knee, and the operation number of times is many, and the extension distance is limited.

In order to solve the above technical problem, an embodiment of the utility model provides the following scheme:

a children type tumor joint prosthesis for keeping femoral neck and knee joint surfaces comprises a backbone extension section, wherein two ends of the backbone extension section are respectively matched and connected with a proximal femoral prosthesis and a distal femoral prosthesis;

the joint surface of the proximal femur prosthesis and the femur and the joint surface of the distal femur prosthesis and the femoral condyle are both provided with a trabecular bone porous structure groove;

the outer side of the distal femoral prosthesis is detachably connected with an outer femoral steel plate;

the proximal femur prosthesis and the femur are connected by a proximal femur central tension nail and a proximal femur auxiliary nail, and the distal femur prosthesis and the femoral condyle are connected by a locking nail and a cancellous bone tension nail.

Wherein the thickness of the trabecular bone porous structure with the trabecular bone porous structure groove of the proximal femur prosthesis and the distal femur prosthesis is 1-5 mm.

Wherein, the outer side of the distal femoral prosthesis is connected with the outer side steel plate of the femur through a fixing nail.

The upper end face of the proximal femoral prosthesis is provided with an axially arranged threaded hole, and the outer side of the proximal femoral prosthesis is provided with a countersunk through hole which is obliquely upward;

the proximal femur central tension nail is inserted into the femur and then screwed with the threaded hole, and the proximal femur auxiliary nail is inserted into the countersunk head through hole and then connected with the femur.

The upper portion of the femur outer side steel plate is provided with a stepped unthreaded hole, the lower portion of the femur outer side steel plate is provided with a threaded hole, the fixing nail is inserted into the stepped unthreaded hole and then connected with the femur distal prosthesis, and the locking nail is screwed with the threaded hole of the femur outer side steel plate and then connected with the femur condyle.

The outer side of the middle part of the distal femoral prosthesis is provided with through holes which are obliquely downward and are arranged in a crossed manner, and cancellous bone tension nails are inserted into the through holes and then connected with femoral condyles.

Wherein, a baffle is arranged at one end of the femur far-end prosthesis close to the femur condyle.

The central tension nail at the proximal end of the femur is axially provided with a tension nail through hole, and the length of the central tension nail at the proximal end of the femur and the length of the external thread of the central tension nail at the proximal end of the femur are matched with the osteotomy position of a patient.

The shape and the size of a joint surface between the proximal femur prosthesis and the epiphysis are designed in an individualized and customized manner;

the design method of the joint surface of the proximal femoral prosthesis comprises the following steps:

performing biological reconstruction on the patient image data by using MIMICS software to obtain an appearance matched with the patient skeleton;

on the basis of the shape matching, the front part, the back part and the front part respectively extend 4mm to the periphery, and the inner part extends 8mm to the periphery, so that the joint surface of the proximal femoral prosthesis is obtained.

The shape and the size of a joint surface between the distal femur prosthesis and an epiphysis are designed in an individualized customization mode;

the design method of the joint surface of the distal femoral prosthesis comprises the following steps:

performing biological reconstruction on the image data of the patient by using MIMICS software to obtain the shape of a bone model matched with the skeleton of the patient;

the front side, the back side and the outer side of the cross section of the femur distal prosthesis are matched with the shape of the bone model, and the inner side is appropriately narrowed by about 1cm to obtain the joint surface of the femur distal prosthesis.

Utility model's above-mentioned scheme includes following beneficial effect at least:

utility model's above-mentioned scheme, the children type tumour joint prosthesis who remains femoral neck and knee joint face can remain the metaphysis tissue of thighbone upper segment and thighbone distal end, utilizes the metaphysis tissue connection of prosthesis and thighbone upper segment and thighbone distal end, remains children patient's bone growth function. In order to ensure that the bone growth of the child patient is not limited by the steel plate after the operation, after the prosthesis and the bone tissue form firm biological fixation, the steel plate at the outer side of the femur can be removed through a minimally invasive operation, the spongy bone tension nails crossed inside and outside are increased, the stability of the prosthesis is further improved, the operation frequency is low, and the operation is simple; the femur bone extension device is provided with a bone extension section, the femur extension distance is not limited, and the length of the bone extension section can be determined according to the position of the femur osteotomy of a patient.

Drawings

FIG. 1 is a first schematic view of the installation of a children-type tumor joint prosthesis with femoral neck and knee joint surfaces reserved;

FIG. 2 is a second schematic view of the installation of the inventive childhood-type tumor joint prosthesis with the femoral neck and knee joint surfaces preserved;

FIG. 3 is a perspective view of a proximal femoral prosthesis of the inventive pediatric tumor joint prosthesis retaining the femoral neck and knee joint surfaces;

FIG. 4 is an enlarged view of the point B in FIG. 3;

FIG. 5 is a front view of a proximal femoral prosthesis of the inventive pediatric tumor joint prosthesis retaining the femoral neck and knee joint surfaces;

FIG. 6 is a perspective view of the backbone extension of the inventive childhood-type tumor joint prosthesis retaining the femoral neck and knee joint surfaces;

fig. 7 is a front view of the diaphysis extension of the inventive childhood-type tumor joint prosthesis retaining the femoral neck and knee joint surfaces;

figure 8 is a perspective view of a distal femoral prosthesis of the inventive pediatric tumor joint prosthesis retaining the femoral neck and knee joint surfaces;

FIG. 9 is an enlarged view taken at A in FIG. 3;

figure 10 is a front view of a distal femoral prosthesis of the inventive pediatric tumor joint prosthesis retaining the femoral neck and knee joint surfaces;

FIG. 11 is a schematic structural view of a proximal femoral central tension nail of the inventive pediatric tumor joint prosthesis with preserved femoral neck and knee joint surfaces;

fig. 12 is a schematic structural view of the locking pin of the children-type tumor joint prosthesis of the utility model, which retains the femoral neck and knee joint surfaces.

Reference numerals:

1. a proximal femoral central tension nail; 11. a tension nail through hole; 12. an external thread; 2. auxiliary nails are arranged at the proximal ends of the thighbones; 3. a proximal femoral prosthesis; 31. a threaded hole; 32. countersunk through holes; 33. a conical round hole; 34. a rotation prevention groove; 4. a backbone extension section; 41. a conical joint; 42. anti-rotation flat square; 43. a conical bore interface; 44. an anti-rotation clamping groove; 5. a femoral distal prosthesis; 51. a tapered joint; 52. anti-rotation clamping pieces; 53. a tension nail through hole; 54. A baffle plate; 6. a lateral femoral steel plate; 7. fixing nails; 8. locking nails; 81. cancellous bone threads; 82. a tapered thread; 9. cancellous bone tension nails; a1, femur; a2 femoral condyle.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

As shown in fig. 1-2, the present embodiment provides a pediatric tumor joint prosthesis with preserved femoral neck and knee joint surfaces, which is used for joint reconstruction after resection of a large range of tumors or other lesions at the middle section of knee femur a1, and can effectively solve the clinical problem of bone growth function of a pediatric patient. The femoral bone prosthesis comprises a proximal femoral prosthesis 3, a diaphysis extension section 4 and a distal femoral prosthesis 5, wherein a proximal femoral central tension nail 1 and a proximal femoral auxiliary nail 2 are adopted to connect the proximal femoral prosthesis 3 and a femur a1, and a locking nail 8 and a cancellous bone tension nail 91 are adopted to connect the distal femoral prosthesis 5 and a femoral condyle a 2. Two ends of the backbone extension section 4 are respectively matched and connected with a proximal femur prosthesis 3 and a distal femur prosthesis 5; the joint surface of the proximal femur prosthesis 3 and the femur a1 and the joint surface of the distal femur prosthesis 5 and the femoral condyle a2 are both provided with a trabecular bone porous structure groove; the outer side of the distal femur prosthesis 5 is detachably connected with an outer femur steel plate 6;

the prosthesis of this embodiment retains the metaphyseal tissue of the upper segment of femur a1 and the distal end of femur a1, and retains the bone growth function of the pediatric patient by virtue of the connection of the prosthesis to the metaphyseal tissue of the upper segment of femur a1 and the distal end of femur a 1. In order to ensure that the bone growth of the child patient is not limited by the steel plate after the operation, after the prosthesis and the bone tissue form firm biological fixation, the steel plate 6 at the outer side of the femur can be removed through a minimally invasive operation, the spongy bone tension nails 91 which are crossed inside and outside are added to further increase the stability and reliability of the prosthesis, the operation frequency is less, and the operation is simple; the bone fracture plate is provided with the bone extension section 4, the extension distance of the thighbone is not limited, and the length of the bone extension section 4 can be determined according to the position of the patient thighbone osteotomy.

When the femur side tumor of a child patient is replaced by an extensible prosthesis, the femur part of the affected limb tumor section is generally required to be cut off, meanwhile, the tibia joint surface and the epiphyseal part are required to be cut off, the cut-off affected limb does not have the growth function, and the phenomenon that the left limb and the right limb are not long seriously due to the growth of the child after the operation. When the children tumor joint prosthesis for retaining the femoral neck and the knee joint surface of the utility model is adopted for replacement, important anatomical tissues such as the femoral bone epiphysis, the tibial epiphysis and the joint surface and the like can be retained, the natural growth function of a child patient is retained, the prosthesis is fixed at the far end of the femoral bone by adopting steel plates at two sides through locking nails, and meanwhile, the bone-combining interface of the prosthesis and the bone is designed into a bone trabecula porous structure, so that firm biological fixation can be formed, and the phenomenon that the left and right limbs are not long seriously is not caused after operation;

when the femur side tumor of a child patient is replaced by an extensible prosthesis, the left and right limbs are not equal in length, when the femur side tumor is seriously replaced, multiple operations are needed to prolong the limbs, especially, the age of an infant is smaller, the prolonging times are increased, the extension time cannot be too long once due to the fact that the extension time is pulled by soft tissues and nerve blood vessels, otherwise, the soft tissues and the nerve blood vessels can be damaged, serious damage is caused, the extension time can be prolonged only through multiple operations, and great pain and body injury are brought to the patient. Adopt the utility model discloses a when remaining the children type tumour joint prosthesis of thighbone neck and knee articular surface and replacing, only need a tumour excision operation and a minimal access surgery just can obtain better effect, and the operation is simple moreover, and the number of times is few, and the incision is little, and the wound that the patient receives is little, and economic cost is lower, and patient's health resumes sooner, and long-term curative effect is exact.

As shown in fig. 1-10, the backbone extension segment 4 and the proximal femur prosthesis 3, and the backbone extension segment 4 and the distal femur prosthesis 5 of this embodiment are connected in an assembled manner, specifically, an anti-rotation fastener 52 and a tapered joint 51 are disposed on the upper portion of the distal femur prosthesis 5, an anti-rotation locking slot 44 and a tapered hole interface 43 are disposed on the lower portion of the dry bone extension segment 4, the tapered joint 51 is inserted into the tapered hole interface 43, the distal femur prosthesis 5 and the backbone extension segment 4 are connected by a tapered surface, and the anti-rotation fastener 52 is inserted into the anti-rotation locking slot 44, so that the assembled connection between the distal femur prosthesis 5 and the backbone extension segment 4 is realized, and the distal femur prosthesis 5 and the backbone extension segment 4 are prevented from rotating relatively. The upper part of the connecting stem extension section 4 is provided with an anti-rotation flat square 42 and a conical joint 41, the proximal femoral prosthesis 3 is provided with an anti-rotation groove 34 and a conical round hole 33, the conical joint 41 is inserted into the conical round hole 33, the proximal femoral prosthesis 3 and the stem extension section 4 are connected by utilizing the conical surface, and the anti-rotation flat square 42 is inserted into the anti-rotation groove 34, so that the proximal femoral prosthesis 3 and the stem extension section 4 are connected in a matched mode, and the proximal femoral prosthesis 3 and the stem extension section 4 are prevented from rotating relatively.

As shown in fig. 1-2 and 3-5, the proximal femoral prosthesis 3 of the present embodiment is connected to the femur a1 at the upper part and to the stem extension 4 at the lower part. The upper end face of the proximal femur prosthesis 3 is provided with an axially arranged threaded hole 31, the proximal femur central tension nail 1 is screwed with the threaded hole 31 after being inserted into the femur a1, the outer side of the proximal femur prosthesis 3 is provided with a countersunk through hole 32 which is inclined upwards, the proximal femur auxiliary nail 2 is connected with the femur a1 after being inserted into the countersunk through hole 32, the proximal femur central tension nail 1 is used for tensioning and fixing the upper end bone tissue of the femur a1 and the proximal femur prosthesis 3, and the proximal femur central tension nail 1 and the proximal femur auxiliary nail 2 are used for connecting the femur a1 with the proximal femur prosthesis 3. Specifically, 2 countersunk head through holes 32 are provided obliquely upward on an outer side of the proximal femoral prosthesis 3.

As shown in Figs. 1-2 and 8-10, the outer side of the distal femoral prosthesis 5 of this embodiment is detachably mounted with an outer femoral steel plate 6. The upper portion of thighbone outside steel sheet 6 is equipped with the ladder unthreaded hole, the lower part is equipped with screw hole 31, the ladder unthreaded hole preferred be provided with 2-3, fix nail 7 is connected with thighbone distal prosthesis 5 after inserting the ladder unthreaded hole, and lockpin 8 is connected thighbone condyle a2 after screwing with thighbone outside steel sheet 6's screw hole 31, utilizes lockpin 8 and fix nail 7 to install thighbone outside steel sheet 6 on thighbone distal prosthesis 5. The bone growth of the child patient after operation is not limited by the steel plate, after the prosthesis and the bone tissue form firm biological fixation, the bone can be removed through minimally invasive surgery, the locking nail 8 and the fixing nail 7 are removed, and the steel plate 6 on the outer side of the femur is removed from the distal femur prosthesis 5.

Furthermore, 2-3 threaded holes 31 are formed in the outer side of the distal femoral prosthesis 5, and the fixing nail 7 is inserted into the stepped unthreaded hole of the outer bone steel plate and then connected with the distal femoral prosthesis 5 and the outer bone steel plate and the distal femoral prosthesis 5.

As shown in fig. 1-2 and 11, the central tension nail 1 at the proximal end of the femur of the present embodiment is provided with a tension nail through hole 5311 in the axial direction, and the tension nail through hole 5311 is used for positioning. The nut cap of the central tension nail 1 at the proximal end of the femur is provided with a hexagon socket, so that the central tension nail 1 at the proximal end of the femur can be conveniently screwed in. The length of the central tension nail 1 at the proximal end of the femur and the length of the external thread 12 of the central tension nail 1 at the proximal end of the femur are matched with the osteotomy position of a patient, the length of the central tension nail 1 at the proximal end of the femur and the length of the external thread 12 can be customized according to the osteotomy position of the patient, the central tension nail is suitable for each patient, and the adaptability is good.

As shown in fig. 1-2 and 12, the locking pin 8 of the present embodiment has a hexagonal socket on the nut, which facilitates the screwing-in of the locking pin 8. The outside of the locking nail 8 is provided with the tapered thread 82 and the cancellous bone thread 81, and the locking nail is provided with a self-tapping groove, so that the femoral condyle a2 is not required to be punched, the locking nail 8 is directly self-tapped, and the operation is simple and convenient.

The shape and size of the joint surface between the proximal femur prosthesis 3 and the epiphysis of the embodiment are designed in an individualized and customized manner; the design method of the joint surface of the proximal femoral prosthesis 3 comprises the following steps: performing biological reconstruction on the patient image data by using MIMICS software to obtain an appearance matched with the patient skeleton; on the basis of the matched shape, the front part, the back part and the front part respectively extend to the periphery by 4mm, and the inner part extends to the periphery by 8mm to obtain the combined surface of the proximal femoral prosthesis 3.

The shape and size of the joint surface between the distal femur prosthesis 5 and the epiphysis of the present embodiment are designed by individual customization; the design method of the joint surface of the distal femur prosthesis 5 is that the MIMICS software is used to carry out biological reconstruction on the image data of the patient to obtain the shape of a bone model matched with the skeleton of the patient; the front side, the back side and the outer side of the cross section of the artificial femoral head are matched with the shape of the bone model, and the inner side is appropriately narrowed by about 1cm to obtain the joint surface of the distal femoral prosthesis 5. The outer side of the middle part of the distal femoral prosthesis 5 is provided with through holes which are arranged in a cross way and are inclined downwards, and preferably 2 through holes are arranged. After the femur outer steel plate 6 is detached from the femur distal prosthesis 5, the cancellous bone tension nail 91 is inserted into the through hole and then connected with the femur condyle a2, and the femur distal prosthesis 5 is connected with the femur condyle a2 again, so that the stability and reliability of the prosthesis are further improved. The distal femoral prosthesis 5 has a stop 54 at the end adjacent to the femoral condyle a2, and the stop 54 is used to prevent the prosthesis from backing out during knee flexion.

As shown in fig. 3-4 and 8-9, the thickness of the trabecular bone porous structure with the trabecular bone porous structure groove of the proximal femoral prosthesis 3 of the present embodiment is 1-5mm, which is beneficial for bone ingrowth and long-term biological fixation effect. The thickness of the trabecular bone porous structure with the trabecular bone porous structure groove of the distal femoral prosthesis 5 is 1-5 mm.

The childhood tumor joint prosthesis of the embodiment can reserve metaphysis tissues of the upper segment of the femur a1 and the distal end of the femur a1, and reserve the bone growth function of a pediatric patient; the combined end surface of the distal femur prosthesis 5 and the proximal femur prosthesis 3 with epiphysis is provided with a trabecular bone porous structure, which is beneficial to bone ingrowth and forms an interlocking structure to achieve a long-term biological fixation effect; the bone growth of the child patient after operation is not limited by the side steel plate, after the prosthesis and bone tissue form firm biological fixation, the steel plate at the outer side of the far end of the femur a1 is removed, the cancellous bone tension nail 91 crossed inside and outside is added, and the stability and reliability of the prosthesis are improved; the size of the combined surface of the prosthesis, the femur a1 and the femoral condyle a2 is designed to meet the proper space for the bone growth of a patient and ensure the mechanical conduction of the bone combination interface.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims (10)

1. A children type tumor joint prosthesis for keeping femoral neck and knee joint surfaces is characterized by comprising a backbone extension section, wherein two ends of the backbone extension section are respectively matched and connected with a proximal femoral prosthesis and a distal femoral prosthesis;

the joint surface of the proximal femur prosthesis and the femur and the joint surface of the distal femur prosthesis and the femoral condyle are both provided with a trabecular bone porous structure groove;

the outer side of the distal femoral prosthesis is detachably connected with an outer femoral steel plate;

the proximal femur prosthesis and the femur are connected by a proximal femur central tension nail and a proximal femur auxiliary nail, and the distal femur prosthesis and the femoral condyle are connected by a locking nail and a cancellous bone tension nail.

2. The childform tumor joint prosthesis of claim 1, wherein the thickness of the trabecular porous structure of the proximal femoral prosthesis and the trabecular porous structure of the distal femoral prosthesis with the trabecular porous structure groove is 1-5 mm.

3. The childform tumor joint prosthesis of claim 1, wherein the distal femoral component is attached to the lateral femoral plate by a staple.

4. The childhood-type tumor joint prosthesis for preserving the articular surfaces of the neck and knee of claim 1, wherein the proximal femoral prosthesis has an axially disposed threaded hole at the upper end surface thereof, and the proximal femoral prosthesis has an obliquely upward countersunk through hole at the outer side thereof;

the proximal femur central tension nail is inserted into the femur and then screwed with the threaded hole, and the proximal femur auxiliary nail is inserted into the countersunk head through hole and then connected with the femur.

5. The children's tumor joint prosthesis with preserved femoral neck and knee joint surfaces as claimed in claim 1, wherein the lateral femoral steel plate has a stepped smooth hole on its upper portion and a threaded hole on its lower portion, the fixing pin is inserted into the stepped smooth hole and then connected to the distal femoral prosthesis, and the locking pin is screwed into the threaded hole of the lateral femoral steel plate and then connected to the femoral condyle.

6. The childhood-type tumor joint prosthesis for preserving the articular surfaces of the neck and knee of claim 1, wherein the distal femoral prosthesis has a through hole formed on the outside of the middle portion thereof, the through hole being inclined downward and intersecting, and a cancellous bone tension nail is inserted into the through hole to connect with the femoral condyle.

7. The childform tumor joint prosthesis of claim 1, wherein a stop is provided on an end of the distal femoral prosthesis proximate to the femoral condyle.

8. The childhood-type tumor joint prosthesis for preserving the articular surfaces of the neck and knee of claim 1, wherein the central tension nail at the proximal end of the femur is axially provided with a tension nail through hole, and the length of the central tension nail at the proximal end of the femur and the length of the external thread of the central tension nail at the proximal end of the femur are adapted to the osteotomy position of the patient.

9. The childhood-type tumor joint prosthesis of claim 1, wherein the proximal femoral prosthesis has a shape and size of the interface with the epiphysis that is individually custom designed;

the design method of the joint surface of the proximal femoral prosthesis comprises the following steps:

performing biological reconstruction on the patient image data by using MIMICS software to obtain an appearance matched with the patient skeleton;

on the basis of the shape matching, the front part, the back part and the front part respectively extend 4mm to the periphery, and the inner part extends 8mm to the periphery, so that the joint surface of the proximal femoral prosthesis is obtained.

10. The childhood-type tumor joint prosthesis of claim 1, wherein the shape and size of the interface between the distal femoral prosthesis and the epiphysis is individually customized;

the design method of the joint surface of the distal femoral prosthesis comprises the following steps:

performing biological reconstruction on the image data of the patient by using MIMICS software to obtain the shape of a bone model matched with the skeleton of the patient;

the front side, the back side and the outer side of the cross section of the femur distal prosthesis are matched with the shape of the bone model, and the inner side is appropriately narrowed by about 1cm to obtain the joint surface of the femur distal prosthesis.

Images