Femoral stem prosthesis and femoral stem prosthesis system

Abstract

The invention relates to the technical field of medical instrument artificial prostheses, in particular to a femoral stem prosthesis and a femoral stem prosthesis system. A femoral stem prosthesis comprises a femoral neck, a stem body connected with the femoral neck and a stem tail connected with the stem body in the direction away from the femoral neck, side grooves are formed in the peripheral faces, located on the two sides of the femoral neck, of the stem body, side wings are connected with the side grooves in a sliding mode, injection holes are formed in the ends of the side wings, and outflow holes are formed in the peripheral faces of the side wings. And the injection hole is communicated with the outflow hole. Triple fixation is achieved through the side wings, the back wings and the holes in the side wings; the handle body and the handle tail are fixed and selected in a split manner, so that the adaptability of the prosthesis for the osteoporosis patient is improved; the same operation file can be adopted for various handle types through one handle tail, and the operation efficiency is improved.

Description

Technical Field

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

[0002] Common hip fractures in older adults include femoral neck fractures (see Figure 1 ) and intertrochanteric fractures (see Figure 2 Elderly patients often have varying degrees of osteoporosis or coexisting multi-system diseases such as cardiovascular disease. During prosthesis replacement, the distal end 9 is filed into the proper position with a file. When the file is removed and the prosthesis is implanted, it is found to be loose and mismatched. Sometimes, with a certain model of prosthesis, the distal end 9 is matched, but the proximal end 8 may become loose; with other models of prosthesis, the proximal end 8 is matched, but the distal end 9 may become loose. Elderly patients have poor bone quality, and the osteoporosis conditions at the proximal end 8 and distal end 9 are often different, resulting in a poor match between the prosthesis and the femur of the osteoporotic patient. Summary of the Invention

[0003] In order to make the prosthesis better fit with the femur of osteoporosis patients at both the proximal and distal ends, in a first aspect, the present application provides a femoral stem prosthesis, which is implemented using 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 surfaces of the stem body located on both sides of the femoral neck are provided with side grooves, and side wings are slidingly connected to the side grooves. The ends of the side wings are provided with injection holes, and the outer peripheral surfaces of the side wings are provided with outflow holes. The injection holes are connected to the outflow holes.

[0005] By adopting the above technical solution, if the handle body does not match, the side wings can be inserted, and the top corners of the side wings on both sides of the handle body can enter the medullary cavity to further strengthen the fixation. If the insertion alone is still not enough to fix the handle, bone cement can be added through the injection hole and discharged through the outflow port to further fix the handle body.

[0006] A dorsal groove is provided on the outer peripheral surface of the handle body away from the inclination direction of the femoral neck, and a dorsal wing is slidably connected to the dorsal groove.

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

[0008] The dorsal wing is divided into three density regions, with the density doubling from the proximal end to the distal end.

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

[0010] The handle tail is provided with two tail grooves that intersect with each other, and the two tail grooves have different extension lengths in the axial direction of the handle tail.

[0011] By adopting the above technical solution, the cross-shaped long and short tail grooves can deform toward the center, making it easier to implant. After being subjected to inward pressure, they tend to expand outward, effectively preventing loosening, preventing distal mismatch after implantation, and avoiding thigh pain. They can also pass through the anterior femoral arch and avoid perforating cortical bone.

[0012] A force release groove is provided at the bottom of the tail groove, the force release groove is communicated with the tail groove, and the force release groove is arc-shaped.

[0013] By adopting the above technical solution, the stress relief groove can release the stress generated by machining the tail groove, thereby reducing the deformation of the prosthesis caused by stress release.

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

[0015] By adopting this technical solution, the collar only protrudes from the handle body on the side of the handle body away from the dorsal wing, while the other sides naturally connect with the handle body, creating a smooth transition. This structure allows the handle body to move fully downward, better adapting to the femur of osteoporosis patients.

[0016] The handle body and the handle tail are split structures.

[0017] By adopting the above technical solution, the split femoral stem prosthesis can timely fix the distal end to avoid excessive looseness, and can achieve proximal biological fixation with good matching, thereby achieving fusion fixation of the prosthesis and the instrument, and realizing composite fixation.

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

[0019] By adopting the above technical solution, the distal end of the human femur can be more easily implanted when inserted into the stem tail, and is more difficult to loosen toward the proximal end.

[0020] The handle body is provided with a retrieval hole and / or a reconstruction hole, and the retrieval hole and / or the reconstruction hole is a through hole.

[0021] By adopting this technical solution, the femoral stem prosthesis features an extraction hole, facilitating hooking and removal with instruments during revision surgery, providing an optimal force point for removal. The reconstruction hole is used for intraoperative binding of titanium cables and other fixation accessories, working in conjunction with the collar protrusion to achieve reconstruction of the greater trochanter. The long reconstruction hole allows for vertical adjustment of the binding position, facilitating personalized fixation for elderly patients with osteoporosis.

[0022] On the other hand, the present application provides a femoral stem prosthesis system, which is implemented through the following technical solutions.

[0023] A femoral stem prosthesis system comprises a femoral stem prosthesis, other prostheses and a medullary cavity rasp. Both the other prosthesis and the femoral stem prosthesis have distal ends similar in shape to the medullary cavity rasp.

[0024] By adopting the above technical solution, a single set of shaping files can be used for all of the above-mentioned surgical cases. This allows one surgical tool to be used with different types of prostheses. This saves surgical time and effectively avoids mismatches between the prosthesis and the patient, achieving a single tool for multiple uses, covering a wide range of surgical procedures and increasing surgical efficiency.

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

[0026] 1. The handle body is fixed. If it is loose, you can insert the side wings, and the top corners of the side wings on both sides of the handle body enter the medullary cavity to achieve further strengthened fixation; if the match is still not good, you can add dorsal wings, and the ends of the dorsal wings are inserted into the medullary cavity in the other direction to achieve further strengthened fixation; if the match is still not good, you can also inject bone cement into the injection holes of the side wings, and the bone cement flows out from the outflow holes to achieve triple fixation.

[0027] 2. The proximal and distal bone conditions of patients with osteoporosis, such as the elderly, may be different. Through the split structure, different types of prostheses can be selected for the stem body and stem tail, and the proximal and distal ends are fixed in different ways. A composite fixation method with proximal biological fixation and distal file matching. When shaping the distal end with a file, stop when the shaping is one size smaller than the predicted size, pull out the file, implant the stem tail of the predicted size, and then select the appropriate stem body model, and then implant the proximal component. Therefore, the split femoral stem prosthesis can fix the distal end in time to avoid it being too loose, and can achieve proximal biological fixation with good matching. Achieve fusion fixation of the prosthesis and the instrument, and achieve composite fixation.

[0028] 3. The system of this application can be applied to various femoral side revisions, defects and intertrochanteric fractures, avoiding tediousness, avoiding differences between intraoperative and preoperative planning, and poor matching between the prosthesis and the patient due to other uncontrollable factors. The femoral stem shape of this system can meet the surgical needs of all the above cases with a set of shaping files. It realizes the matching of one surgical tool with different types of prostheses. It saves surgical time, effectively avoids poor matching between the prosthesis and the patient, and achieves the purpose of one handle for multiple uses, covering a wide range and high surgical efficiency. It can be adapted to the treatment of primary, revision, intertrochanteric fractures, femoral defects and other diseases. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0030] Figure 2 Schematic diagram of an intertrochanteric fracture.

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

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

[0033] Figure 5 yes Figure 3 Schematic diagram of the femoral stem highlighting the caudal notch structure (A).

[0034] Figure 6 yes Figure 3 Schematic diagram of the femoral stem highlighting the caudal notch structure (2).

[0035] Figure 7 yes Figure 4 Enlarged view of part I in the middle.

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

[0037] Figure 9 It is a schematic diagram of the flank cross section.

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

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

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

[0041] Figure 13 Schematic diagram of the femoral stem showing the reconstruction hole.

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

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

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

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

[0046] Figure 18 Schematic diagram of the femoral stem system including surgical tools.

[0047] Description of reference numerals: 1. Handle; 11. Collar; 12. Lateral wing; 121. Injection hole; 122. Outflow hole; 123. Bottom 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. Extraction hole; 18. Reconstruction hole; 19. Femoral neck; 2. Handle tail; 21. Protruding ridge; 22. Tail groove; 221. Force release groove; 23. Conical convex part; 24. Overlapping tooth part; 25. Tail tip; 251. Unshaved edge line; 252. Shaved edge line; 253. Tangent point; 8. Proximal end; 9. Distal end. DETAILED DESCRIPTION

[0048] The present application is further described in detail below in conjunction with all the drawings and specific embodiments. Example

[0049] This embodiment is a femoral stem prosthesis.

[0050] Reference Figure 3 and Figure 4The femoral stem comprises 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 facing away from the femoral neck 19, and a stem tail 2 integrally formed with the stem body 1 in a direction away from the collar 11. The stem tail 2 is designed to mate with the distal end 9 of the human femur. The femoral neck 19 is an axially tilted, symmetrical structure. The stem body 1 is generally rectangular, and the stem tail 2 is generally cylindrical, with the axis of the rectangular and cylindrical shapes offset. Side grooves 14 are formed along the axial direction of the stem tail 2 on the outer circumference of the stem body 1 on either side of the femoral neck 19, which also have the larger area of the stem body 1. These side grooves 14 are dovetail-shaped and are slidably connected to side wings 12. A dorsal groove 16 is formed along the axial direction of the stem body 1 on the outer circumference of the stem body 1 facing away from the axial tilt of the femoral neck 19, which also has the smaller area of the stem body 1 and is away from the axial offset direction of the stem body 1. The sidewall of the handle 1 is also provided with multiple handle protrusions, arranged along the axis of the handle tail 2. Each handle protrusion is elongated. The sidewall of the handle tail 2 is provided with multiple ridges 21, arranged circumferentially along the handle tail 2. Each ridge 21 is elongated and extends axially along the handle tail 2. A tail groove 22 is provided at the end of the handle tail 2 away from the handle 1. The tail groove 22, ridges 21, and side grooves 14 are arranged sequentially along the axis of the handle tail 2. The side grooves 14 extend through the handle protrusions.

[0051] Reference Figure 3 The handle 1 has an optimized collar 11 structure. The collar 11 only protrudes from the handle 1 on one side of the handle 1's outer periphery, away from the dorsal wing 13. The other sides naturally connect with the outer periphery of the handle 1, creating a smooth transition. This structure allows the handle 1 to move fully downward, making it more adaptable to the femur of osteoporosis patients.

[0052] Reference Figure 5 The handle tail 2 is provided with two cross-shaped tail grooves 22. Figure 6 The depths of the two tail grooves 22 are different. The length of the tail groove 22 on the same plane as the side groove 14 is shorter than that of the other tail groove 22. The cross-shaped tail groove 22 can deform toward the center, so it is easier to implant. After being subjected to inward pressure, it has a tendency to expand outward, which can effectively prevent loosening, prevent the distal end 9 from mismatching after implantation, and avoid thigh pain. It can also pass through the anterior femoral arch and avoid penetrating the cortical bone. Figure 7 The tail groove 22 is provided with a stress relief groove 221 at the bottom of the groove away from the shank 2. The stress relief groove 221 is an arc-shaped groove bottom with a diameter greater than the groove width. The stress relief groove 221 can relieve the stress generated by machining the tail groove 22 and reduce the deformation of the prosthesis caused by stress release.

[0053] See also Figure 8 and Figure 9The cross section of the wing 12 is an isosceles triangle. The side with the two bottom angles 123 can be inserted into the side groove 14, and the side with the top angle 124 can be inserted into the medullary cavity, which can increase the adaptability of the femoral stem body 1 to the human femur. An injection hole 121 is provided in the middle of the wing 12 along the axial direction. The opening end of the injection hole 121 is located at Figure 8 As shown, the inflow hole at the upper end of the wing 12 does not penetrate the lower end of the wing 12. An outflow hole 122 is provided on the outer circumference of the wing 12, communicating 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 outflow hole 122. The bone cement only binds to the bone at the ends of the wing 12, without affecting the biological fixation of the proximal end 8. This achieves dual fixation of the proximal end 8 with both biological and cement fixation, allowing patients with poor bone density to undergo biological fixation.

[0054] Reference Figure 2 and Figure 10 The dorsal groove 16 is also a dovetail groove 22. The dorsal wing 13 is slidingly connected to the handle body 1 through the dovetail groove 22. The dorsal wing 13 is provided with three trabecular structures 135 along the axial direction of the handle body 1, which are proximal trabeculae 131, middle trabeculae 132 and distal trabeculae 133 from the proximal end 8 to the distal end 9 respectively. The trabecular density increases exponentially. The density of the proximal trabeculae 131 is 0.25 g / cm3, the density of the middle trabeculae 132 is 0.5 g / cm3, and the density of the distal trabeculae 133 is 1 g / cm3, so that the elastic modulus of the proximal trabeculae 131 is the smallest, and increases successively toward the distal end 9 to approach the simulated state of the human body from cancellous bone to cortical bone, thereby reducing stress shielding on the back.

[0055] Normal hip joint pressure is transmitted gently and gradually to the cancellous bone of the femoral head and then to the cortical bone of the femoral neck. When a cemented or uncemented femoral prosthesis is placed in the femoral medullary cavity, the prosthesis and the femur form a new mechanical system. The transmission of hip joint force becomes nonphysiological, and the pressure exerted by the hip joint on the femoral head is shared by the implanted prosthesis. When two or more materials form a mechanical system, the material with the higher elastic modulus bears more of the load, a phenomenon known as stress shielding. According to Wolff's law, when stress stimulation increases, bone strain increases, leading to an increase in the bone formation component of bone metabolism; when stress stimulation decreases, bone strain decreases, and bone metabolism is primarily characterized by increased absorption. This stress shielding effect can cause bone loss around the prosthesis in the proximal femur, particularly in the calcar. The dorsal wing 13 structure reduces stress shielding at the dorsal region, enabling better long-term bone ingrowth and thus enhancing osseointegration of the femoral stem prosthesis.

[0056] Reference Figure 11The dorsal wing 13 is a trabecular structure 135 as a whole, with a number of hollow holes 134 inside, and the hollow holes 134 extend axially along the handle body 1. The cross-section of the hole 134 is circular, and the cross-sectional sizes of the several holes 134 are different. The trabecular structure 135 with holes 134 of the dorsal wing 13 has the function of enhancing stability. This structure is similar to the bionic lotus stem structure. The diameter of the internal hole 134 gradually increases from the outside to the inside, and the thickness of the hole wall also changes accordingly, forming a unique gradient distribution. When subjected to lateral force, energy is absorbed through the gradual collapse of the hole wall. The holes 134 collapse in sequence from the outside to the inside, and finally form a counterclockwise folding mode, and even show a "negative Poisson's ratio" characteristic (the more pressure, the more contraction), which greatly improves the buffering capacity. When subjected to bending force, the internal hole wall disperses stress through asymmetric deformation, avoids local concentrated fracture, and strengthens the strength of the trabecular module.

[0057] Reference Figure 12 The two sides of the handle body 1 with the side groove 14 are not completely parallel, forming an angle, the degree of the angle is b, b is 6 degrees. In other embodiments, b can also be 8 degrees or 10 degrees.

[0058] In other embodiments, the distal end 9 of the handle body 1 may further be provided with a reconstruction hole 18. Figure 13 As shown, reconstruction hole 18 is a long, through hole, extending along the axis of the shank and tail. It is used for tying titanium cables and other fixation accessories during surgery, and cooperates with the protrusion on collar 11 to achieve reconstruction of the greater trochanter. The long, narrow reconstruction hole 18 allows for vertical adjustment of the tying position, facilitating personalized fixation for elderly patients with osteoporosis.

[0059] In other embodiments, the distal end 9 of the handle body 1 may also be provided with a take-out hole 17. Figure 14 There is a take-out hole 17 on the femoral stem prosthesis, which is convenient for hooking and taking out with an instrument during revision, and has a good take-out force point.

[0060] The implementation principle of this embodiment is as follows: the main body of the handle body 1 is fixed. If it is loose, the side wings 12 can be inserted, and the top corners 124 of the side wings 12 protruding on both sides of the handle body 1 enter the medullary cavity to achieve further strengthened fixation; if the matching is still not good, the dorsal wings 13 can be added, and the ends of the dorsal wings 13 are inserted into the medullary cavity in the other direction to achieve further strengthened fixation; if the matching is still not good, bone cement can be injected into the injection holes 121 of the side wings 12, and the bone cement flows out from the outflow holes 122 to achieve triple fixation. Example

[0061] 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 connected to the stem tail 2. Figure 14The handle tail 2 includes a conical convex portion 23, a stacked tooth portion 24 connected to the distal end 9 of the conical convex portion 23, and a tail tip portion 25 connected to the distal end 9 of the stacked tooth portion 24. The handle tail 2 is made of high-nitrogen stainless steel. In other embodiments, it can also be made of cobalt-chromium-molybdenum alloy. Its shape is similar to that of a plastic file for prosthetic replacement. The conical convex portion 23 is connected to the handle body 1 with a stable taper of 12 / 14. The stacked tooth 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. In this way, when the distal end 9 of the human femur is inserted into the handle tail 2, it can be more easily implanted and is more difficult to loosen toward the proximal end 8.

[0062] The tail tip 25 is formed by cutting a regular rotating body on three sides. Figure 15 In the figure, the lower edge of the tail tip 25 is the uncut edge line 251, and the inward edge line 252 is the cut edge line. The cutting is done by the tangent point 253 of an ellipse that is tangent to the uncut edge line 251. The major axis of the ellipse is determined by the direction of the axis of the handle and tail 2 being offset inwardly of the human body by a certain amount, and the offset is 2mm. In other embodiments, the offset can also be 4mm or 6mm. Figure 16 and Figure 17 , Figure 16 This is the main 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. Figure 17 The ellipse is determined to have an R2 of 1000±200 and an eccentricity of 5°-15°. Three-sided sharpening can avoid thigh pain at the distal end 9, facilitate the implantation of the prosthesis on the anterior and posterior sides of the distal end 9, avoid the cortical bone, reduce the chance of perforation, and facilitate implantation.

[0063] The implementation principle of this embodiment is that the bone conditions of the proximal end 8 and the distal end 9 of patients with osteoporosis, such as the elderly, may be different. Through the split structure, the handle body 1 and the handle tail 2 can choose different types of prostheses, and the proximal end 8 and the distal end 9 are fixed in different ways. The proximal end 8 is biologically fixed, and the distal end 9 is fixed with a file. When the distal end 9 is shaped with a file, the shaping is stopped when it is one size smaller than the predicted model, the file is pulled out, the handle tail 2 of the predicted model is implanted, and then the appropriate handle body 1 model is selected, and then the proximal end 8 component is implanted. Therefore, the split femoral stem prosthesis can fix the distal end 9 in time to avoid it being too loose, and can achieve biological fixation of the proximal end 8 with good matching. The prosthesis and the instrument are fused and fixed, and composite fixation is achieved. Example

[0064] This embodiment is a femoral stem prosthesis system, including three sets of femoral stems and the same surgical tool.

[0065] like Figure 18The wing-shaped cement / biological dual fixation type in combination 3 is a simplified product diagram of Example 1. Combinations 1, 2, and 3 all have similar handle and tail 2 structures and can all use the same intramedullary rasp to perform replacement surgery.

[0066] The implementation principle of this embodiment is that the system of this application can be applied to various femoral side revisions, defects and intertrochanteric fractures, and can avoid tediousness, differences between intraoperative and preoperative planning, and poor matching between the prosthesis and the patient due to other uncontrollable factors. The femoral stem shape of this system can meet the surgical needs of all the above cases with a set of shaping files. It realizes the matching of one surgical tool with different types of prostheses. It saves surgical time, effectively avoids the poor matching between the prosthesis and the patient, and achieves the purpose of one handle for multiple uses, covering a wide range and high surgical efficiency. It can be adapted to the treatment of primary, revision, intertrochanteric fractures, femoral defects and other diseases.

[0067] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A femoral stem prosthesis, characterized in that: The invention comprises a femoral neck (19), a handle body (1) connected to the femoral neck (19), and a handle tail (2) connected to the handle body (1) in a direction away from the femoral neck (19), wherein the outer peripheral surface of the handle body (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 a sliding connection with the side groove (14), an injection hole (121) is provided at the end of the side wing (12), and an outflow hole (122) is provided on the outer peripheral surface of the side wing (12), and the injection hole (121) is communicated with the outflow hole (122).

2. The femoral stem prosthesis according to claim 1, characterized in that: The outer peripheral surface of the handle body (1) away from the oblique direction of the femoral neck (19) is provided with a dorsal groove (16), and a dorsal wing (13) is slidably connected to the dorsal 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 doubling from the proximal end (8) to the distal end (9).

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

5. The femoral stem prosthesis according to claim 4, characterized in that: A force-releasing groove (221) is provided at the bottom of the tail groove (22), the force-releasing groove (221) is communicated with the tail groove (22), and the force-releasing groove (221) is in an arc shape.

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

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

8. The femoral stem prosthesis according to claim 6, characterized in that: The stem tail (2) includes a conical convex portion (23), a stacked tooth portion (24) connected to the distal end (9) of the conical convex portion (23), and a tail tip portion (25) connected to the distal end (9) of the stacked tooth portion (24). The stacked tooth 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 claims 1-3, characterized in that: The handle body (1) is provided with a removal hole (17) and / or a reconstruction hole (18), and the removal hole (17) and / or the reconstruction hole (18) are through holes.

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

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