A femoral stem prosthesis and a femoral stem prosthesis system

Abstract

This application relates to the technical field of medical device prostheses, and in particular to a femoral stem prosthesis and a femoral stem prosthesis system. A femoral stem prosthesis includes a femoral neck, a stem body connected to the femoral neck, and a stem tail connected to the stem body in a direction away from the femoral neck. Side grooves are provided on the outer peripheral surface of the stem body located on both sides of the femoral neck. Side wings are slidably connected to the side grooves. An injection hole is provided at the end of each side wing, and an outflow hole is provided on the outer peripheral surface of each side wing. The injection hole and the outflow hole communicate with each other. This application achieves triple fixation through the side wings, dorsal wing, and holes in the side wings; the separate fixation and selection of the stem body and stem tail improves the fit of the prosthesis for osteoporosis patients; and multiple stem types can be used with the same surgical file through a single stem tail, improving surgical efficiency.

Description

Technical Field

[0001] This application relates to the technical field of medical device prostheses, and in particular to a femoral stem prosthesis and a femoral stem prosthesis system. Background Technology

[0002] Common hip fractures in the elderly include femoral neck fractures (see...) Figure 1 ) and intertrochanteric fractures (see Figure 2 Elderly patients often have varying degrees of osteoporosis or multiple systemic diseases such as cardiovascular disease. During prosthesis replacement, when the distal 9 end is filed to the appropriate position, a mismatch is found after the file is removed and the prosthesis is inserted. Sometimes, for a certain type of prosthesis, the distal 9 end may fit, but the proximal 8 end may become loose; conversely, for another type of prosthesis, the proximal 8 end may fit, but the distal 9 end may become loose. Elderly patients often have poor bone quality, and the degree of osteoporosis in the proximal 8 and distal 9 ends often differs, leading to poor femoral fit between the prosthesis and the patient's osteoporotic femur. Summary of the Invention

[0003] In order to achieve a better fit between the prosthesis and the femur of osteoporotic patients at both the proximal and distal ends, this application provides a femoral stem prosthesis, which is achieved by the following technical solution.

[0004] A femoral stem prosthesis includes a femoral neck, a stem body connected to the femoral neck, and a stem tail connected to the stem body in a direction away from the femoral neck. The outer peripheral surface of the stem body located on both sides of the femoral neck is provided with a side groove, and a side wing is provided in sliding connection with the side groove. The end of the side wing is provided with an injection hole, and the outer peripheral surface of the side wing is provided with an outflow hole. The injection hole and the outflow hole are connected.

[0005] By employing the above technical solutions, if the stem body is mismatched, lateral wings can be inserted, with the apex of the lateral wings protruding from both sides of the stem body into the medullary cavity for further enhanced fixation. If insertion alone is insufficient for adequate fixation, bone cement can be used, injected through the injection port and drained through the outlet, allowing for more complete fixation of the stem body.

[0006] The outer peripheral surface of the stem body, which is inclined away from the femoral neck, is provided with a back groove, and a back wing is slidably connected to the back groove.

[0007] By adopting the above technical solution, a dorsal wing can also be inserted into the back of the femoral stem prosthesis, and the end of the dorsal wing can be inserted into the medullary cavity in another direction to achieve further enhanced fixation.

[0008] The dorsal wing is divided into three density zones, with the density increasing from the near end to the far end.

[0009] By adopting the above technical solution, the elastic modulus of the trabeculae near the bone is minimized and gradually increases towards the distal end, so as to approximate the simulated state of the human body from cancellous bone to cortical bone, thereby reducing stress shielding in the back.

[0010] The handle end is provided with two intersecting tail grooves, and the two tail grooves have different lengths in the axial direction of the handle end.

[0011] By adopting the above technical solution, the long and short cross-shaped tail grooves can deform towards the center, thus improving implantation. Under inward pressure, they also tend to expand outward, effectively preventing loosening, avoiding distal mismatch after implantation, preventing thigh pain, and allowing them to pass through the anterior arch of the femur without perforating the cortical bone.

[0012] The bottom of the tail groove is provided with a pressure relief groove, which is connected to the tail groove and is arc-shaped.

[0013] By adopting the above technical solution, the stress relief groove can release the stress generated by the processing tail groove and reduce the deformation of the prosthesis caused by stress release.

[0014] It is also provided with a collar, one end of which is connected to the femoral neck and the other end is connected to the handle. The collar protrudes from the handle only on the outer peripheral surface of the handle in the direction of the femoral neck inclination.

[0015] By adopting the above technical solution, the collar protrudes from the handle only on the outer periphery of the handle, away from the dorsal wing, while the other sides connect naturally with the outer periphery of the handle, creating a smooth transition. This structure allows the handle to move downwards sufficiently, making it more suitable for the femur of osteoporosis patients.

[0016] The handle body and handle tail are separate structures.

[0017] By adopting the above technical solutions, the split-type femoral stem prosthesis can promptly fix the distal end to prevent excessive looseness, while also achieving proximal biological fixation with good matching. It achieves fusion fixation of the prosthesis and the device, realizing composite fixation.

[0018] The stem end includes a conical protrusion, a toothed portion connected to the distal end of the conical protrusion, and a tail tip connected to the distal end of the toothed portion. The toothed portion is a stacked tooth shape, and the cross-section of each tooth is an isosceles trapezoid. The upper base of the isosceles trapezoid faces the distal end of the femoral stem prosthesis, and the lower base of the isosceles trapezoid faces the proximal end of the femoral stem prosthesis.

[0019] By adopting the above technical solution, when inserting the distal end of the femur into the stem tail, it is easier to implant and less likely to loosen proximally.

[0020] The handle is provided with an extraction hole and / or a reconstruction hole, which are through holes.

[0021] By adopting the above technical solution, the femoral stem prosthesis has an extraction hole, which facilitates removal by hooking instruments during revision surgery and provides a good force point for extraction. The reconstruction hole is used for intraoperative binding of fixation accessories such as titanium cables, and works with the collar protrusion to achieve reconstruction of the greater trochanter. The elongated reconstruction hole allows for vertical adjustment of the binding position, making it more convenient for personalized adjustment and fixation for elderly patients with osteoporosis.

[0022] On the other hand, this application provides a femoral stem prosthesis system, which is achieved through the following technical solution.

[0023] A femoral stem prosthesis system includes a femoral stem prosthesis, other prostheses, and a medullary reamer, wherein the other prostheses and the femoral stem prosthesis both have a distal end similar in shape to the medullary reamer.

[0024] By adopting the above technical solution, a single shaping file can meet the surgical needs of all the aforementioned cases. This allows for the use of a single surgical tool to match different types of prostheses. It saves surgical time, effectively avoids poor prosthesis-patient fit, and achieves the goal of a multi-purpose tool with broad coverage and high surgical efficiency.

[0025] In summary, this application includes at least one of the following beneficial technical effects.

[0026] 1. The stem body is fixed. If it is loose, side wings can be inserted. The apex of the side wings protrudes from both sides of the stem body and enters the medullary cavity to achieve further reinforcement of fixation. If the fit is still not good, a dorsal wing can be added. The end of the dorsal wing is inserted into the medullary cavity in another direction to achieve further reinforcement of fixation. If the fit is still not good, bone cement can be injected into the injection hole of the side wing. The bone cement flows out from the outflow hole to achieve triple fixation.

[0027] 2. In elderly patients with osteoporosis, the proximal and distal bone conditions may differ. A split-type structure allows for the selection of different prosthesis sizes for the stem and tail, with different fixation methods for the proximal and distal ends. A composite fixation method is used, employing proximal biological fixation and distal reaming. When shaping the distal end with a reamer, the shaping stops when it is one size smaller than the predicted size. The reamer is then removed, and the predicted tail size is implanted. Finally, a suitable stem size is selected, and the proximal component is implanted. Therefore, the split-type femoral stem prosthesis can promptly fix the distal end to prevent excessive looseness while achieving proximal biological fixation and a good match. This achieves fusion fixation of the prosthesis and the device, realizing composite fixation.

[0028] 3. The system described in this application is applicable to various types of femoral lateral revision, defects, and intertrochanteric fractures. It avoids cumbersome procedures and prevents poor prosthesis-patient matching due to discrepancies between intraoperative and preoperative planning, as well as other uncontrollable factors. The femoral stem morphology of this system allows for surgery in all the aforementioned cases using a single shaping file. It achieves compatibility of different prosthesis types with a single surgical tool. This saves surgical time, effectively avoids poor prosthesis-patient matching, and realizes the goal of multi-purpose use, broad coverage, and high surgical efficiency. It is suitable for the treatment of primary, revision, intertrochanteric fractures, and femoral defects. Attached Figure Description

[0029] Figure 1 This is a diagram of a femoral neck fracture.

[0030] Figure 2 This is a schematic diagram of an intertrochanteric fracture.

[0031] Figure 3 This is a schematic diagram of the femoral stem structure in this application.

[0032] Figure 4 yes Figure 3 A schematic diagram of the femoral stem with two lateral wings and one dorsal wing removed.

[0033] Figure 5 yes Figure 3 A schematic diagram of the caudal groove structure of the femoral stem (I).

[0034] Figure 6 yes Figure 3 Schematic diagram of the caudal groove structure of the femoral stem (II).

[0035] Figure 7 yes Figure 4 Enlarged view of the middle section (I).

[0036] Figure 8 This is a schematic diagram of the side wing structure.

[0037] Figure 9 This is a schematic diagram of the cross-section of the side wing.

[0038] Figure 10 This is a schematic diagram of the dorsal wing structure.

[0039] Figure 11 yes Figure 10 Schematic diagram of the cross-section of the dorsal wing.

[0040] Figure 12 This is a schematic diagram showing the inward tilt angle of the handle.

[0041] Figure 13 This is a schematic diagram showing the femoral stem with a reconstruction hole.

[0042] Figure 14This is a schematic diagram of the split femoral stem.

[0043] Figure 15 This is a schematic diagram of the cutting of the tail of a split femoral stem.

[0044] Figure 16 This is a schematic diagram of the angles of the two sides of the tail of the split femoral stem.

[0045] Figure 17 This is a schematic diagram showing the offset angle between the axis of the split femoral stem and the axis of the stem tail.

[0046] Figure 18 This is a schematic diagram of the femoral stem system containing surgical tools.

[0047] Explanation of reference numerals in the attached figures:

[0048] 1. Handle; 11. Collar; 12. Lateral wings; 121. Injection hole; 122. Outflow hole; 123. Base angle; 124. Apex angle; 13. Dorsal wing; 131. Proximal trabeculae; 132. Middle trabeculae; 133. Distal trabeculae; 134. Hole; 135. Trabecular structure; 14. Lateral groove; 15. Handle protrusion; 16. Dorsal groove; 17. Removal hole; 18. Reconstruction hole; 19. Femoral neck; 2. Handle tail; 21. Rib; 22. Tail groove; 221. Release groove; 23. Conical protrusion; 24. Overlapping teeth; 25. Tail tip; 251. Uncut edge line; 252. Cut edge line; 253. Cutting point; 8. Proximal end; 9. Distal end. Detailed Implementation

[0049] The present application will be further described in detail below with reference to all the accompanying drawings and specific embodiments. Example

[0050] This embodiment is a femoral stem prosthesis.

[0051] Reference Figure 3 and Figure 4The femoral stem includes a femoral neck 19, a collar 11 connected to the femoral neck 19, a stem body 1 connected to the side of the collar 11 away from the femoral neck 19, and a stem tail 2 integrally formed with the stem body 1 in the direction away from the collar 11. The stem tail 2 is used to mate with the distal end 9 of the human femur. The femoral neck 19 is an axially inclined symmetrical structure. The stem body 1 is generally similar to a cuboid, and the stem tail 2 is generally similar to a cylinder. The axis of the cuboid is offset from the axis of the cylinder. On the outer peripheral surface of the stem body 1 on both sides of the femoral neck 19, which are also the two side walls of the stem body 1 with larger areas, a side groove 14 is provided along the axial direction of the stem tail 2. The side groove 14 is dovetail-shaped and is slidably connected to a side wing 12. On the outer peripheral surface of the stem body 1 away from the axial inclination direction of the femoral neck 19, which is also the side wall of the stem body 1 with smaller areas and away from the axial offset direction of the stem body 1, a back groove 16 is provided along the axial direction of the stem body 1. The handle body 1 has multiple handle body 1 protrusions on its side wall, arranged along the axis of the handle tail 2, each protrusion being elongated. The handle tail 2 has multiple raised ridges 21 on its side wall, arranged circumferentially, each raised ridge 21 extending axially in the handle tail 2. The end of the handle tail 2 away from the handle body 1 has a tail groove 22 extending along the axis of the handle body 1. The tail groove 22, raised ridges 21, and side grooves 14 are arranged sequentially on the axis of the handle tail 2, with the side grooves 14 passing through the handle body 1 protrusions.

[0052] Reference Figure 3 The handle 1 has an optimized collar 11 structure. The collar 11 protrudes from the handle 1 only on the outer peripheral surface of the handle 1 away from the dorsal wing 13, while the other sides naturally connect with the outer peripheral surface of the handle 1, with a smooth transition. This structure allows the handle 1 to move down sufficiently, making it more suitable for the femur of osteoporosis patients.

[0053] Reference Figure 5 The shank tail 2 has two intersecting, cross-shaped tail grooves 22. (Refer to...) Figure 6 The two tail grooves 22 have different depths, and the tail groove 22 on the same plane as the side groove 14 is shorter than the other tail groove 22. The cross-shaped tail grooves 22 can deform towards the center, making implantation easier. Under inward pressure, they also tend to expand outward, effectively preventing loosening, avoiding mismatch at the distal end 9 after implantation, avoiding thigh pain, and allowing them to pass through the anterior arch of the femur without perforating the cortical bone. (Refer to...) Figure 7 The bottom of the tail groove 22, away from the shank tail 2, is provided with a stress-relieving groove 221. The stress-relieving groove 221 is an arc-shaped groove bottom with a diameter greater than the groove width. The stress-relieving groove 221 can release the stress generated during the machining of the tail groove 22 and reduce the deformation of the prosthesis caused by stress release.

[0054] See Figure 8 and Figure 9The side wing 12 has an isosceles triangle cross-section. The side containing the two base angles 123 can be inserted into the side groove 14, while the side containing the apex angle 124 inserts into the medullary cavity, increasing the fit between the femoral stem 1 and the human femur. An injection hole 121 is provided axially in the middle of the side wing 12, with the opening end of the injection hole 121 located at... Figure 8 As shown in the diagram, the inlet hole does not penetrate the lower end of the wing 12. An outlet hole 122 is provided on the outer peripheral surface of the wing 12, and the outlet hole 122 communicates with the injection hole 121. The wing 12 is inserted into the handle 1. Bone cement is injected through the injection hole 121 and flows out through the outlet hole 122. The bone cement only bonds with the bone at both ends of the wing 12, without affecting the proximal 8 biological fixation. This achieves dual fixation of the proximal 8 using both biological and cement fixation, enabling biological fixation even for patients with poor bone density.

[0055] Reference Figure 2 and Figure 10 The back groove 16 is also a dovetail groove 22. The back wing 13 is slidably connected to the handle 1 through the dovetail groove 22. The back wing 13 is provided with three trabecular structures 135 along the axial direction of the handle 1. From the proximal end 8 to the distal end 9, they are the proximal trabecular 131, the middle trabecular 132, and the distal trabecular 133. The density of the trabecular bone increases exponentially. The density of the proximal trabecular 131 is 0.25 g / cm3, the density of the middle trabecular 132 is 0.5 g / cm3, and the density of the distal trabecular 133 is 1 g / cm3. This makes the elastic modulus of the proximal trabecular 131 the smallest and increases sequentially towards the distal end 9, so as to approximate the simulated state of the human body from cancellous bone to cortical bone and reduce the stress shielding of the back.

[0056] Normal hip joint pressure is transmitted smoothly and gradually to the cancellous bone of the femoral head, and then to the cortical bone of the femoral neck and shaft. When a cemented or uncemented femoral prosthesis is present in the femoral medullary cavity, the prosthesis and femur form a new biomechanical system. The transmission of hip joint forces becomes non-physiological, and the pressure of the hip joint on the femoral head is jointly accomplished by the implanted prosthesis. When two or more materials form a mechanical system, the material with the higher elastic modulus bears more load, a phenomenon known as stress shielding. According to Wolff's law, increased stress stimulation leads to increased bone strain and increased bone formation in bone metabolism; decreased stress stimulation leads to decreased bone strain and increased bone resorption. The stress shielding effect can cause bone loss around the proximal femoral prosthesis, especially in the femoral talus region. The structure of the dorsal wing 13 reduces stress shielding on the back, achieving better long-term bone ingrowth, thus resulting in better osseointegration of the femoral stem prosthesis.

[0057] Reference Figure 11The back wing 13 is a trabecular structure 135 with several hollow holes 134 extending axially along the stem 1. The cross-section of each hole 134 is circular, but the cross-sectional sizes of the holes vary. This trabecular structure 135 with holes 134 enhances stability. Similar to a biomimetic lotus stem structure, the diameter of the internal holes 134 gradually increases from the outside to the inside, with varying hole wall thickness, creating a unique gradient distribution. Under lateral stress, energy is absorbed through the gradual collapse of the hole walls. The holes 134 collapse sequentially from the outside to the inside, ultimately forming a counter-clockwise rotating folding pattern, even exhibiting a "negative Poisson's ratio" characteristic (contracting more under pressure), significantly improving buffering capacity. Under bending stress, the internal hole walls disperse stress through asymmetrical deformation, preventing localized fracture and strengthening the trabecular module.

[0058] Reference Figure 12 The handle 1 has two sides with side grooves 14, which are not completely parallel and form an included angle, the degree of which is b, and b is 6°. In other embodiments, b can also be 8° or 10°.

[0059] In other embodiments, the distal end 9 of the handle 1 may also be provided with a reconstruction hole 18, such as... Figure 13 As shown. Reconstruction hole 18 is an elongated through hole, its length direction along the axis of the handle tail 2. It is used for intraoperative binding of fixation accessories such as titanium cables, and cooperates with the protrusion of the collar 11 to achieve reconstruction of the greater trochanter. The elongated reconstruction hole 18 allows for vertical adjustment of the binding position, making it easier for elderly osteoporosis patients to adjust and fix themselves individually.

[0060] In other embodiments, the distal end 9 of the handle 1 may also be provided with a removal hole 17, such as... Figure 14 As shown. The femoral stem prosthesis has an extraction hole 17, which facilitates removal by hooking it with instruments during revision surgery, and provides a good force point for removal.

[0061] The implementation principle of this embodiment is as follows: the main body of the handle 1 is fixed. If it is loose, the side wings 12 can be inserted. The apex 124 of the side wings 12 protrudes from both sides of the handle 1 and enters the medullary cavity to achieve further strengthening of the fixation. If the fit is still not good, the dorsal wing 13 can be added. The end of the dorsal wing 13 is inserted into the medullary cavity in another direction to achieve further strengthening of the fixation. If the fit is still not good, bone cement can be injected into the injection hole 121 of the side wing 12. The bone cement flows out from the outflow hole 122 to achieve triple fixation. Example

[0062] This embodiment is a split-type femoral stem prosthesis. The difference between this embodiment and Embodiment 1 is that the stem tail 2 is a split structure, and the stem body 1 has a groove for connecting with the stem tail 2. Figure 14The stem tail 2 includes a conical protrusion 23, a toothed portion 24 connected to the distal end 9 of the conical protrusion 23, and a tail tip 25 connected to the distal end 9 of the toothed portion 24. The stem tail 2 is made of high-nitrogen stainless steel; in other embodiments, it can also be made of cobalt-chromium-molybdenum alloy, and its shape is similar to that of a plastic file used in prosthesis replacement surgery. The conical protrusion 23 is connected to the stem body 1 with a stable 12 / 14 taper. The toothed portion 24 is a stacked tooth shape, with each tooth having an isosceles trapezoidal cross-section. The upper base of the isosceles trapezoid faces the distal end 9 of the femoral stem prosthesis, and the lower base faces the proximal end 8 of the femoral stem prosthesis. This makes it easier to implant the stem tail 2 when it is inserted into the distal end 9 of the femur, and less likely to loosen towards the proximal end 8.

[0063] The tail tip 25 is formed by cutting a regular rotating body on three sides. See also Figure 15 In the diagram, the lower edge of the tail tip 25 is the uncut edge line 251, and the cut edge line 252 is shown inward. The cutting is done by using an ellipse with the tangent point 253 between it and the uncut edge line 251 as the boundary. The major axis of the ellipse is determined by offsetting the axis of the shank 2 towards the inside of the body by a certain amount, which is 2mm. In other embodiments, the offset can also be 4mm or 6mm. (Refer to...) Figure 16 and Figure 17 , Figure 16 This is the front view of the uncut side. The ellipse is determined so that a is 10° after cutting. In other embodiments, a can also be 6° or 8°, and R1 is 100-200. (Refer to...) Figure 17 The ellipse shape is determined so that R2 is 1000±200 and the eccentricity angle is 5°-15°. The three-sided sharpening can avoid thigh pain in the distal 9, facilitate the implantation of the prosthesis in the anterior, posterior and lateral sides of the distal 9, avoid the cortical bone, reduce the chance of perforation of the cortical bone, and at the same time facilitate implantation.

[0064] The implementation principle of this embodiment is as follows: In elderly patients with osteoporosis, the bone condition of the proximal end 8 and distal end 9 may differ. Through a split structure, the stem 1 and stem tail 2 can be fitted with different sizes of prostheses, and the proximal end 8 and distal end 9 are fixed using different methods. A composite fixation method is used, with biological fixation for the proximal end 8 and matching by a file for the distal end 9. When shaping the distal end 9 with a file, the shaping stops when it is one size smaller than the predicted size. The file is then removed, and the predicted size of the stem tail 2 is implanted. Then, a suitable size of stem 1 is selected, and the proximal end 8 component is implanted. Therefore, the split femoral stem prosthesis can promptly fix the distal end 9 to prevent excessive looseness, while also achieving biological fixation of the proximal end 8 with good matching. This achieves fusion fixation of the prosthesis and the device, realizing composite fixation. Example

[0065] This embodiment is a femoral stem prosthesis system, which includes three sets of femoral stems and the same surgical tool.

[0066] like Figure 18The wing-shaped cement / biological dual fixation type in combination three is a simplified product diagram of embodiment 1. Combinations one, two, and three all have similar shank-tail 2 structures and can all be performed using the same medullary canal file for replacement surgery.

[0067] The implementation principle of this embodiment is as follows: Using the system described in this application, it is applicable to various femoral revision surgeries, defects, and intertrochanteric fractures. It avoids cumbersome procedures and prevents discrepancies between intraoperative and preoperative planning, as well as other uncontrollable factors that could lead to poor prosthesis-patient fit. The femoral stem shape of this system can meet the surgical needs of all the aforementioned cases using a single shaping file. It achieves the goal of matching different types of prostheses with a single surgical tool. This saves surgical time, effectively avoids poor prosthesis-patient fit, and achieves the purpose of multi-purpose use, broad coverage, and high surgical efficiency. It is suitable for the treatment of primary, revision, intertrochanteric fractures, femoral defects, and other conditions.

[0068] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A femoral stem prosthesis, characterized in that: It includes a femoral neck (19), a stem (1) connected to the femoral neck (19), and a stem tail (2) connected to the stem (1) in a direction away from the femoral neck (19). The outer peripheral surface of the stem (1) located on both sides of the femoral neck (19) is provided with a side groove (14), and a side wing (12) is provided in sliding connection with the side groove (14). The end of the side wing (12) is provided with an injection hole (121), and the outer peripheral surface of the side wing (12) is provided with an outflow hole (122). The injection hole (121) and the outflow hole (122) are connected.

2. The femoral stem prosthesis according to claim 1, characterized in that: The outer peripheral surface of the handle (1) in the direction of inclination away from the femoral neck (19) is provided with a back groove (16), and a back wing (13) is slidably connected to the back groove (16).

3. The femoral stem prosthesis according to claim 2, characterized in that: The dorsal wing (13) is divided into three density regions, with the density increasing from the near end (8) to the far end (9).

4. A femoral stem prosthesis according to any one of claims 1-3, characterized in that: The handle (2) is provided with two intersecting tail grooves (22), and the two tail grooves (22) have different extension lengths in the axial direction of the handle (2).

5. A femoral stem prosthesis according to claim 4, characterized in that: The bottom of the tail groove (22) is provided with a stress-relieving groove (221), which is connected to the tail groove (22) and is arc-shaped.

6. A femoral stem prosthesis according to any one of claims 1-3, characterized in that: It is also provided with a collar (11), one end of which is connected to the femoral neck (19) and the other end is connected to the handle (1). The collar (11) protrudes from the handle (1) only on the outer peripheral surface of the handle (1) in the direction of inclination of the femoral neck (19).

7. A femoral stem prosthesis according to any one of claims 1-3, characterized in that: The handle body (1) and the handle tail (2) are separate structures.

8. A femoral stem prosthesis according to claim 6, characterized in that: The tail (2) includes a conical protrusion (23), a toothed portion (24) connected to the distal end (9) of the conical protrusion (23), and a tail tip (25) connected to the distal end (9) of the toothed portion (24). The toothed portion (24) is a stacked tooth shape, and the cross-section of each tooth is an isosceles trapezoid. The upper base of the isosceles trapezoid faces the distal end (9) of the femoral stem prosthesis, and the lower base of the isosceles trapezoid faces the proximal end (8) of the femoral stem prosthesis.

9. A femoral stem prosthesis according to any one of claims 1-3, characterized in that: The handle (1) is provided with a removal hole (17) and / or a reconstruction hole (18), wherein the removal hole (17) and / or the reconstruction hole (18) are through holes.

10. A femoral stem prosthesis system, characterized in that: Includes the femoral stem prosthesis as described in any one of claims 1-9, other prostheses, and medullary file, wherein the other prosthesis and the femoral stem prosthesis both have a distal end (9) similar in shape to the medullary file.

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