CN114452051B - Keep children type tumour joint prosthesis of thighbone neck and knee articular surface - Google Patents

Abstract

The invention provides a children type tumor joint prosthesis for retaining 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 between the proximal femur prosthesis and the femur and the joint surface between the distal femur prosthesis and the femoral condyle are both provided with grooves with bone trabecula porous structures; 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 growth of the bone of the postoperative child patient is not limited by the steel plate, after the prosthesis and the bone tissue form firm biological fixation, the steel plate at the outer side of the femur can be disassembled, and the cancellous bone tension nails crossed inside and outside are increased, so that the stability and the reliability of the prosthesis are further improved.

Description

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

The patent application is a divisional application of application No. 202010689397.5, application No. 20200715, title of the invention, a children-type tumor joint prosthesis with femoral neck and knee joint surface preserved.

Technical Field

The invention relates to the technical field of artificial prosthesis placement, in particular to a child tumor joint prosthesis capable of keeping femoral neck and knee joint surfaces.

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 shaft of the limbs need to follow the broad resection principle in clinic, so the reconstruction of the shaft defect after tumor resection is of great concern, especially for children patients, and in recent years, children are good-developed population of malignant bone tumors, and the common malignant tumors are osteosarcoma, ewing sarcoma and the like, and the tumors often occur at the metaphysis of the knee joint (the metaphysis of femur and the metaphysis of tibia). 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.

At present, the most common reconstruction method is to use an extensible prosthesis to reconstruct the bone defect, but the reconstruction method has the defects of multiple operations, large trauma to the patient (the traditional extensible 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 invention provides a children tumor joint prosthesis for reserving a femoral neck and knee joint surface, the existing femoral reconstruction method has the following problems that a patient is subjected to a large wound (a traditional extensible prosthesis), the economic cost is high, the long-term curative effect is not definite, a steel plate arranged on the outer side of the distal end of a femur can cause the problems of clinical feedback of swelling and pain around the joint, limitation of knee bending and difficulty in sewing due to the fact that the steel plate is large in size in the operation, the operation frequency is large, and the extension distance is limited.

In order to solve the above technical problem, an embodiment of the present invention provides the following solutions:

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 between the proximal femur prosthesis and the femur and the joint surface between the distal femur prosthesis and the femoral condyle are both provided with bone trabecular porous structure grooves;

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 1-5mm.

Wherein, the outer side of the distal femur prosthesis is connected with the outer femur steel plate 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 the cancellous bone tension nails are inserted into the through holes and then connected with the femoral condyles.

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

The central tension nail for the proximal femur is axially provided with a tension nail through hole, and the length of the central tension nail for the proximal femur and the length of the external thread of the central tension nail for the proximal 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 the shape 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.

The scheme of the invention at least comprises the following beneficial effects:

according to the scheme of the invention, the childhood tumor joint prosthesis with the femoral neck and knee joint surfaces reserved can reserve the metaphysis tissues of the upper femoral segment and the distal femoral segment, and the bone growth function of the child patient is reserved by connecting the prosthesis with the metaphysis tissues of the upper femoral segment and the distal femoral segment. 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 the inventive childhood-type tumor joint prosthesis with preserved femoral neck and knee joint surfaces;

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 the proximal femoral end prosthesis of the children's tumor joint prosthesis of the present invention 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 the proximal femoral prosthesis of the inventive pediatric tumor joint prosthesis retaining the femoral neck and knee articular surfaces;

FIG. 6 is a perspective view of a diaphysis extension 5 of the childhood tumor joint prosthesis of the invention preserving the femoral neck and knee articular surfaces;

FIG. 7 is a front view of the stem extension of the inventive pediatric tumor joint prosthesis retaining the femoral neck and knee joint surfaces;

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

FIG. 9 is an enlarged view of the point A in FIG. 8;

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

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

fig. 5 is a schematic structural view of the locking pin of the children-type tumor joint prosthesis with the femoral neck and knee joint surfaces preserved according to the invention.

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 circular hole; 34. a 0-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 of the preferred embodiments

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 retained femoral neck and knee joint surfaces, which is used for joint reconstruction after resection of a large range of tumors or other lesions in the middle section of the knee femur a1, and can effectively solve the clinical problem of bone growth function of a pediatric patient. The femoral bone fracture repair device 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 a2. 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 the embodiment can reserve metaphyseal tissues of the upper part of the femur a1 and the distal end of the femur a1, and the bone growth function of the child patient can be reserved by connecting the prosthesis with the metaphyseal tissues of the upper part of the femur a1 and the distal end of the 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 is used for replacement, important anatomical tissues such as femoral and tibial epiphysis and the joint surface are retained, the natural growth function of a child patient is retained, the prosthesis is fixed at the far end of the femur by steel plates at two sides through locking nails, and meanwhile, a bone trabecula porous structure is designed on a combined interface of the prosthesis and the bone, so that firm biological fixation can be formed, and the phenomenon that the left limb and the right limb are not long seriously and the like after operation can not be caused;

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. When the children-type tumor joint prosthesis for retaining the femoral neck and knee joint surfaces is used for replacement, better effects can be obtained only by one tumor resection operation and one minimally invasive operation, the operations are simple, the times are few, the incision is small, the wound of a patient is small, the economic cost is low, the body recovery of the patient is quicker, and the 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 extension section 4 of the connecting stem 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 extension section 4 of the stem 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 extension section 4 of the stem are assembled and connected, and the proximal femoral prosthesis 3 and the extension section 4 of the stem 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 a threaded hole 31 which is axially arranged, 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 head through hole 32 which is inclined upwards, the proximal femur auxiliary nail 2 is inserted into the countersunk head through hole 32 and then connected with the femur a1, 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 and 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 fig. 1-2 and 8-10, the outer side of the distal femoral prosthesis 5 of the present 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 inserts behind the ladder unthreaded hole and is connected with thighbone distal prosthesis 5, connect thighbone condyle a2 after the screw hole 31 of lock nail 8 and thighbone outside steel sheet 6 closes soon, utilize lock nail 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 outer side of the locking nail 8 is provided with the tapered threads 82 and the cancellous bone threads 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 for 4mm to the periphery, and the inner part extends for 8mm to the periphery, so that the joint surface of the proximal femur prosthesis 3 is obtained.

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 femoral prosthesis 5 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 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. When 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 bending.

As shown in fig. 3-4 and 8-9, the thickness of the trabecular bone porous structure with trabecular bone porous structure grooves of the proximal femoral prosthesis 3 of the present embodiment is 1-5mm, which facilitates 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 1-5mm.

The childhood tumor joint prosthesis of the embodiment can keep metaphysis tissues of the upper part of the femur a1 and the far end of the femur a1, and keep bone growth functions of a child patient; the distal femur prosthesis 5 and the proximal femur prosthesis 3 are provided with bone trabecula porous structures on the combined end surface with epiphysis, so that bone ingrowth is facilitated, and an interlocking structure is formed to achieve a long-term biological fixation effect; the growth of the bone of the postoperative child patient is not limited by the side steel plate, after the prosthesis and the 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 nails 91 which are crossed inside and outside are added, and the stability and the reliability of the prosthesis are improved; the size design of the combined surface of the prosthesis and the femur a1 and the femoral condyle a2 meets the proper space for the bone growth of the patient, and ensures the mechanical conduction of the bone combined interface.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (6)

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;

adopt thighbone near-end central authorities pulling force nail and thighbone near-end to assist the nail and connect thighbone near-end prosthesis and thighbone, adopt cancellous bone pulling force nail to connect thighbone far-end prosthesis with the thighbone condyle, adopt the locking nail to connect thighbone outside steel sheet with the thighbone ankle, the outside at thighbone far-end prosthesis middle part is equipped with oblique below and cross arrangement's through-hole, forms firm biological fixation back at prosthesis and bone tissue, demolishs thighbone outside steel sheet, and cancellous bone pulling force nail inserts connect the thighbone condyle behind the through-hole.

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

3. The children-type tumor joint prosthesis for preserving the joint surfaces of the femoral neck and knee as claimed in claim 1, wherein the proximal femoral prosthesis has an axially arranged threaded hole at the upper end surface thereof, and 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.

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

5. The childform tumor joint prosthesis of claim 1, wherein the proximal femoral component has a shape and size of an interface with an 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.

6. The childform tumor joint prosthesis of claim 1, wherein the distal femoral prosthesis has a configuration and size of the interface with the epiphysis that is individually custom designed;

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

performing biological reconstruction on the patient image data 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