Femoral stem prosthesis with adjustable connecting plate

Abstract

The invention relates to the field of orthopedic medical instruments, and discloses a femoral stem prosthesis with an adjustable connecting plate, the femoral stem prosthesis comprises a femoral stem body and a femoral proximal end arranged on the femoral stem body, the femoral proximal end is provided with a first connecting part and a second connecting part, the first connecting part is connected with the femoral stem body, and the second connecting part is connected with the femoral stem body. The second connecting part inclines relative to the first connecting part to form a femoral neck with taper and is used for being connected with a femoral head prosthesis in a conical mode, a connecting plate is arranged at the end, away from the femoral stem body, of the first connecting part, and the length of the portion, extending out of the first connecting part, of the connecting plate can be adjusted. According to the femoral stem prosthesis with the adjustable connecting plate, the actual use length of the connecting plate can be determined according to the condition of the femur in the operation, by means of the new prosthesis improvement scheme, the purpose of early weight bearing after the operation is achieved, the thighbone greater trochanter is reset and stabilized again, and therefore rehabilitation after the hip fracture operation is accelerated.

Description

Technical Field

[0001] The present invention relates to the field of orthopedic medical devices, and particularly to a femoral stem prosthesis with an adjustable connecting plate. Background Art

[0002] In orthopedic medicine, once a patient has femoral and femoral head injuries, necrosis, etc., artificial joint replacement surgery is an effective treatment method to replace and repair the damaged natural joint, restore its physiological function, and relieve pain, and the replacement surgery is increasingly widely accepted by patients.

[0003] However, with the development of population aging and the increase of human lifespan, more and more elderly patients need to undergo hip replacement surgery to meet normal physiological needs and improve the quality of life in old age. Compared with young patients, elderly patients are more likely to have intertrochanteric fractures (i.e., at the greater trochanter) of the femur due to physiological characteristics. Intertrochanteric fractures have always been an important clinical problem. Conventional fixation methods such as proximal intramedullary nails, wire bundling, and bone plates for femoral prostheses cannot solve the problem of fixing the uppermost bone block at the greater trochanter, and can only achieve initial fracture stability, making it difficult to achieve the treatment goal of allowing elderly patients to get out of bed and bear weight immediately after surgery. Hip replacement often fails due to the lack of effective fixation at the proximal end of the prosthesis. Clinically, there is an urgent need to design new joint prostheses and fixation methods to solve the problem of repairing intertrochanteric fractures and achieve effective fixation of the proximal and distal ends of the prosthesis in the environment of elderly osteoporosis.

[0004] There are patents that disclose better fixation of the prosthesis to the muscle and femur by setting a connecting plate on the main body, but the disadvantages of these patents are that the position and size of the connecting plate are fixed. In actual use, it is easy to encounter situations where some elderly patients have good bone quality and do not need to remove the entire greater trochanter during osteotomy, or the greater trochanter of the patient is not completely damaged and does not need to be completely removed, and part of the greater trochanter bone mass can be selectively retained for postoperative rehabilitation. Summary of the Invention

[0005] To solve the technical problems in the background art, the present invention proposes a femoral stem prosthesis with an adjustable connecting plate.

[0006] A femoral stem prosthesis with an adjustable connecting plate proposed by the present invention includes a femoral stem body and a femoral proximal end provided on the femoral stem body. It should be noted that the femoral stem body and the femoral proximal end can be integrally formed or connected by a fixing member. Different from the prior art, the femoral proximal end has a first connecting portion and a second connecting portion. The first connecting portion is connected to the femoral stem, and the second connecting portion is inclined relative to the first connecting portion. A connecting plate is provided at one end of the first connecting portion away from the femoral stem. A connecting hole is provided on the connecting plate, and the length of the connecting plate extending out of the first connecting portion can be adjusted. An elevating connecting plate can be used to determine the actual length of the connecting plate according to the patient's femoral condition during the operation.

[0007] As a further optimized solution of the present invention, the connecting plate has a first position, a second position, and a third position relative to the first connecting portion:

[0008] When the connecting plate is in the first position, the length of the connecting plate extending out of the first connecting portion is the first length;

[0009] When the connecting plate is in the second position, the length of the connecting plate extending out of the first connecting portion is the second length;

[0010] When the connecting plate is in the third position, the length of the connecting plate extending out of the first connecting portion is the third length;

[0011] The first length is less than the second length, and the second length is less than the third length.

[0012] The lifting plate can be adjusted according to the situation of the greater trochanter to meet different usage requirements. The adjustment states can be roughly divided into three types: (1) When the greater trochanter is completely resected, the connecting plate can be adjusted to the highest position (i.e., the connecting plate is in the third position) during use, that is, the extending length of the connecting plate is the longest; (2) When a part of the greater trochanter is resected, adjust the appropriate length of the connecting plate (the connecting plate is in the second position); (3) Of course, if the greater trochanter is not damaged and does not need to be resected, the connecting plate can be adjusted to not extend (i.e., the connecting plate is in the first position).

[0013] As a further optimized solution of the present invention, the first length is 0, that is, the connecting plate does not extend out of the first connecting portion, and the upper end surface of the connecting plate and the end surface of the first connecting portion are in the same horizontal plane.

[0014] As a further optimized solution of the present invention, the connecting plate includes a suture portion, and the connecting hole is formed in the suture portion. When the suture portion faces the first connecting portion (i.e., when the connecting plate is in the first position), a suture interval is formed between the inner side surface of the suture portion and the first connecting portion. Thus, even if the connecting plate does not extend beyond the first connecting portion, the connecting hole can still be used for suturing the tendon.

[0015] Preferably, the cross-section of the connecting plate is arc-shaped, which can increase the bending stiffness of the connecting plate and reduce the risk of fracture.

[0016] Preferably, the connecting plate extends upward along the back and end of the proximal femur, which is beneficial for suture fixation during the operation.

[0017] As a further optimized solution of the present invention, at least two groups of connecting holes are provided on the connecting plate, and at least two groups of the connecting holes are distributed in the sliding direction of the connecting plate relative to the first connecting portion. When the connecting plate is in the second position, at least one group of the connecting holes extends beyond the first connecting portion.

[0018] As a further optimized solution of the present invention, a first wire groove is formed on the connecting plate, and the first wire groove passes through the connecting hole.

[0019] As a further optimized solution of the present invention, a second wire groove is formed on the connecting plate, the second wire groove passes through the connecting hole and the second wire groove is perpendicular to the first wire groove.

[0020] As a further optimized solution of the present invention, the first wire groove and the second wire groove are formed on both the outer side surface and the inner side surface of the connecting plate, and the arrangement methods are the same. The wire grooves cooperate with the connecting holes, and such an arrangement method is more convenient for the wire routing during suturing in the operation.

[0021] As a further optimized solution of the present invention, a sliding hole is formed at one end of the first connecting portion away from the femoral stem body, and the connecting plate is vertically slidably installed in the sliding hole.

[0022] As a further optimized solution of the present invention, an opening is formed on the outer side of the first connecting portion, the opening communicates with the sliding hole. When the length of the connecting plate extending beyond the first connecting portion is the smallest, the connecting plate has a part located in the opening, and the outer side surface of the part of the connecting plate located in the opening and the outer side surface of the first connecting portion are in the same arc surface.

[0023] As a further optimized solution of the present invention, the width of the opening is smaller than the width of the sliding hole. Further increase the stability of the connecting plate.

[0024] As a further optimized solution of the present invention, a tapered hole is provided at one end of the first connecting portion away from the connecting plate. The femoral stem has a connected tapered connecting portion and a stem body portion. The outer side surface of the tapered connecting portion contacts the inner side surface of the tapered hole, and the stem body portion is located outside the tapered hole.

[0025] As a further optimized solution of the present invention, the femoral stem body and the proximal femur are stably and reliably connected through two connection methods. The first method is the taper fit connection between the tapered hole and the outer side surface of the tapered connecting portion, and the second method is the connection through a fixing member (such as a screw) installed between the tapered connecting portion and the first connecting portion.

[0026] As a further optimized solution of the present invention, there is a deformation interval between the end face of the tapered connecting portion and the end face of the tapered hole, which further increases the service life of the prosthesis.

[0027] As a further optimized solution of the present invention, there is a first limiting surface between the tapered connecting portion and the stem body portion, and the first limiting surface abuts against one end of the first connecting portion away from the connecting plate.

[0028] As a further optimized solution of the present invention, a mounting hole is provided on the first connecting portion, and the fixing member is located in the mounting hole.

[0029] As a further optimized solution of the present invention, a sealing member for sealing the mounting hole is detachably mounted on the first connecting portion.

[0030] As a further optimized solution of the present invention, the cross-section of the stem body portion can be circular, elliptical, rectangular, trapezoidal, etc. Of course, when using a rectangle or a trapezoid, it is recommended to add rounded corners; it is recommended to select a cross-section style with a wider outer side and a narrower inner side of the femur to fully consider the stress characteristics of the prosthesis structure.

[0031] As a further optimized solution of the present invention, the cross-section of the stem body portion is thicker at the top and thinner at the bottom. It is recommended to add convex ribs or ribs along the length direction of the stem body in the circumferential direction of the stem body to increase the anti-rotation property of the femoral stem prosthesis.

[0032] As a further optimized solution of the present invention, when the femoral stem body is installed on the first connecting portion, the total length L of the first connecting portion and the femoral stem body is 150 mm - 240 mm, which is 20 mm - 30 mm longer than that on the market, so that the distal end of the prosthesis can reach the narrowest isthmus of the patient's femur, and the fixing effect of the distal end of the prosthesis is better. Especially for the case of osteoporosis, the insertion depth is large and the fixing effect is better.

[0033] In the present invention, for the femoral stem prosthesis with an adjustable connecting plate, the liftable and adjustable connecting plate can determine the actual use length of the connecting plate according to the femoral condition during the operation. By setting this new prosthesis improvement scheme, not only early postoperative weight-bearing can be achieved, but also the greater trochanter of the femur can be reset and stabilized, thereby accelerating the rehabilitation after hip fracture and providing a new treatment method for intertrochanteric fractures of the femur with senile osteoporosis.

[0034] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic structural diagram of the present invention;

[0036] Figure 2 is a cross-sectional view of the present invention;

[0037] Figure 3 is a schematic structural diagram of the present invention when the connecting plate is in the second position;

[0038] Figure 4 is a schematic structural diagram of the present invention when the connecting plate is in the first position;

[0039] In the figure: 1, femoral stem body; 10, tapered connecting part; 100, first limiting surface; 11, stem body part; 2, proximal femur; 20, first connecting part; 200, sliding hole; 201, opening; 202, tapered hole; 203, mounting hole; 21, second connecting part; 3, connecting plate; 30, connecting hole; 31, first wire groove; 32, second wire groove; 4, fixing part; 5, deformation interval; 6, sealing part; 7, suture interval. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar symbols represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0041] As Figures 1-4A femoral stem prosthesis with an adjustable connecting plate is shown, which includes a femoral stem body 1 and a femoral proximal end 2 provided on the femoral stem body 1. The femoral proximal end 2 has a first connecting portion 20 and a second connecting portion 21. The first connecting portion 20 is connected to the femoral stem body 1, and the second connecting portion 21 is inclined relative to the first connecting portion 20. One end of the first connecting portion 20 away from the femoral stem body 1 is provided with a connecting plate 3. A connecting hole 30 is opened on the connecting plate 3. The length of the connecting plate 3 extending out of the first connecting portion 20 can be adjusted. By using a liftable and adjustable connecting plate 3, the actual use length of the connecting plate 3 can be determined according to the femoral condition during the operation.

[0042] The lifting plate can be adjusted according to the condition of the patient's greater trochanter to meet different usage requirements. Preferably, multiple groups of connecting holes 30 are opened. In this embodiment, three groups of connecting holes 30 are opened. The three groups of connecting holes 30 are distributed in the vertical direction, that is, the three groups of connecting holes 30 are distributed in the moving direction of the connecting plate 3 relative to the first connecting portion 20. Specifically, the connecting plate 3 has a first position, a second position, and a third position relative to the first connecting portion 20:

[0043] If the patient's greater trochanter is not damaged and does not need to be resected, the connecting plate 3 is adjusted to the first position. When the connecting plate 3 is in the first position, the length of the connecting plate 3 extending out of the first connecting portion 20 is the first length, and the first length is 0, that is, the connecting plate 3 at the first position does not extend out of the first connecting portion 20;

[0044] The connecting plate 3 includes a suture portion, and the connecting hole 30 is opened on the suture portion. When the connecting plate 3 is in the first position, a suture interval 7 is formed between the inner side surface of the suture portion and the first connecting portion 20, which is convenient for the connecting hole to play a role in suturing the tendon;

[0045] If the patient's greater trochanter is resected partially, the connecting plate 3 is adjusted to the second position. When the connecting plate 3 is in the second position, the length of the connecting plate 3 extending out of the first connecting portion 20 is the second length, and the second length is greater than the first length;

[0046] When the patient's greater trochanter is completely resected, the connecting plate 3 is adjusted to the highest position, so that the connecting plate 3 is in the third position. When the connecting plate 3 is in the third position, the length of the connecting plate 3 extending out of the first connecting portion 20 is the third length; the third length is greater than the second length.

[0047] The connecting hole 30 on the connecting plate 3 at the first position does not extend out of the first connecting portion 20. In order to facilitate the connecting hole 30 to play a role in suturing the tendon, the connecting plate 3 has a suture portion, and the connecting hole 30 is opened on the suture portion. When the connecting plate 3 is in the first position, a suture interval 7 is formed between the suture portion and the first connecting portion 20. During the suturing process, the suture passes through the suture interval 7 and the connecting hole 30 opposite to the first connecting portion 20 (the connecting hole that does not extend out of the first connecting portion 20), which is convenient for suturing the tendon.

[0048] To facilitate the relative fixation of the connecting plate 3 and the first connecting portion 20, a locking hole is formed in the first connecting portion 20. When the connecting plate 3 is slid so that a set of connecting holes 30 are opposite to and communicate with the locking hole to form a locking channel, the connecting plate 3 and the first connecting portion 20 are fixed in the locking channel by a locking member such as a fixing pin or a screw.

[0049] When the connecting plate 3 is in the first position, the locking member is located in the uppermost connecting hole 30. When the connecting plate is in the second position, the locking member is adjusted according to the patient's condition to be located in the middle connecting hole 30 or the lowermost connecting hole 30;

[0050] When the connecting plate 3 is in the third position, an elongated hole is formed in the connecting plate 3. The elongated hole is opposite to the locking hole, and the locking member penetrates through the elongated hole and the locking hole. The length of the connecting plate 3 extending out of the first connecting portion 20 is adjusted by changing the position of the locking member in the elongated hole. The value range of the third length is 12 mm - 45 mm.

[0051] Preferably, the cross-section of the connecting plate 3 is arc-shaped, which can increase the bending stiffness of the connecting plate 3 and reduce the risk of fracture.

[0052] Preferably, at least two sets of connecting holes 30 are provided on the connecting plate 3. The at least two sets of connecting holes 30 are distributed in the sliding direction of the connecting plate 3 relative to the first connecting portion 20. When the connecting plate 3 is in the second position, at least one set of connecting holes 30 extends out of the first connecting portion 20.

[0053] Preferably, a first wire groove 31 is formed in the connecting plate 3. The first wire groove 31 passes through the connecting hole 30, and the first wire groove 31 is used to guide the wire in the connecting hole 30.

[0054] Preferably, a second wire groove 32 is formed in the connecting plate 3. The second wire groove 32 passes through the connecting hole 30 and the second wire groove 32 is perpendicular to the first wire groove 31.

[0055] Preferably, a sliding hole 200 is formed at one end of the first connecting portion 20 away from the femoral stem 1. The connecting plate 3 is vertically slidably installed in the sliding hole 200. Specifically, a fixing hole is formed in the connecting plate 3, and the connecting plate 3 can be fixed to the first connecting portion 20 by a screw or other fasteners. The connecting plate 3 can be stably connected to the first connecting portion 20, avoiding the fracture situation that is likely to occur in a simple vertical connection.

[0056] Preferably, an opening 201 is formed on the outer side of the first connecting portion 20. The opening 201 communicates with the sliding hole 200. When the length of the connecting plate 3 extending out of the first connecting portion 20 is the smallest, the connecting plate 3 is located in the opening 201, and the outer side surface of the connecting plate 3 and the outer side surface of the first connecting portion 20 are in the same arc surface.

[0057] As a further optimized solution of the present invention, the width of the opening 201 is smaller than the width of the sliding hole 200, so as to achieve better wrapping of the connecting plate 3 and further increase the stability of the connecting plate 3.

[0058] The proximal femur 2 can be integrally formed with the femoral stem body 1. Preferably, in this embodiment, the proximal femur 2 can also be fixedly connected to the femoral stem body 1 through a fixing member 4. Specifically, a tapered hole 202 is formed at one end of the first connecting portion 20 away from the connecting plate 3. The femoral stem body 1 has a connected tapered connecting portion 10 and a stem body portion 11. The outer side surface of the tapered connecting portion 10 contacts the inner side surface of the tapered hole 202, and the stem body portion 11 is located outside the tapered hole 202. A fixing member 4 is further included and installed between the tapered connecting portion 10 and the first connecting portion 20, which has the characteristics of simple assembly, high concentricity, reliable torque transmission, and tight connection. The fixing member 4 can be a screw in the prior art.

[0059] Preferably, there is a deformation interval 5 between the end surface of the tapered connecting portion 10 and the end surface of the tapered hole 202, further increasing the service life of the prosthesis.

[0060] Preferably, there is a first limiting surface 100 between the tapered connecting portion 10 and the stem body portion 11, and the first limiting surface 100 abuts against one end of the first connecting portion 20 away from the connecting plate 3.

[0061] Preferably, a mounting hole 203 is formed on the first connecting portion 20, and the fixing member 4 is located in the mounting hole 203 to prevent the fixing member 4 from being loosened by external force touching, ensuring the connection performance.

[0062] Preferably, a sealing member 6 for sealing the mounting hole 203 is detachably installed on the first connecting portion 20, and the sealing member 6 can be installed in the mounting hole 203 by a threaded manner.

[0063] Preferably, the design of the cross-sectional shape of the stem body portion 11 fully considers the stress characteristics of the prosthesis structure, and the optimal cross-sectional design can be selected: a trapezoidal cross-section with a wide outer side and a narrow inner side with rounded corners, or a circular cross-section, an elliptical cross-section, a rectangular cross-section, a trapezoidal cross-section, etc.; in addition, it is recommended to increase convex ribs or ribs along the length direction of the stem body in the circumferential direction of the stem body to play a role in anti-rotation. Preferably, when the femoral stem body 1 is installed on the first connecting portion 20, the total length L of the first connecting portion 20 and the femoral stem body 1 is 150 mm - 240 mm, and this size is 20 mm - 30 mm longer than that on the market, so that the distal end of the prosthesis can reach the narrowest isthmus of the patient's femur, and the fixing effect of the distal end of the prosthesis is better, especially for the case of osteoporosis, with a large insertion depth and a better fixing effect. In addition, the stem body portion 11 gradually becomes thinner from the end close to the first connecting portion 20 to the end away from the first connecting portion 20.

[0064] It should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0065] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0066] In the present invention, unless otherwise clearly specified and defined, the terms such as "mounted", "connected", "connected to", "fixed" and the like should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0068] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, should be covered by the protection scope of the present invention.

Claims

1. A femoral stem prosthesis with an adjustable connecting plate, comprising a femoral stem body (1) and a proximal femur (2) arranged on the femoral stem body (1), characterized in that: The proximal end of the femur (2) has a first connecting portion (20) and a second connecting portion (21), the first connecting portion (20) is connected to the femoral stem body (1), the second connecting portion (21) is inclined relative to the first connecting portion (20), and a connecting plate (3) is provided at one end of the first connecting portion (20) away from the femoral stem body (1), a connecting hole (30) is opened on the connecting plate (3), and the length of the connecting plate (3) extending out of the first connecting portion (20) can be adjusted.

2. The femoral stem prosthesis with an adjustable connecting plate according to claim 1, characterized in that: The connecting plate (3) has a first position, a second position and a third position relative to the first connecting portion (20): When the connecting plate (3) is in the first position, the length of the connecting plate (3) extending out of the first connecting portion (20) is a first length; When the connecting plate (3) is in the second position, the length of the connecting plate (3) extending out of the first connecting portion (20) is a second length; When the connecting plate (3) is in the third position, the length of the connecting plate (3) extending out of the first connecting portion (20) is a third length; The first length is smaller than the second length, and the second length is smaller than the third length.

3. The femoral stem prosthesis with an adjustable connecting plate according to claim 2, characterized in that: The first length is 0, the connecting plate (3) comprises a stitching portion, the connecting hole (30) is opened on the stitching portion, and when the connecting plate (3) is in the first position, a stitching gap (7) is formed between the inner side surface of the stitching portion and the first connecting portion (20).

4. The femoral stem prosthesis with an adjustable connecting plate according to claim 2, characterized in that: At least two groups of connection holes (30) are provided on the connection plate (3), and at least two groups of connection holes (30) are distributed in the sliding direction of the connection plate (3) relative to the first connection part (20); when the connection plate (3) is in the second position, at least one group of connection holes (30) extends out of the first connection part (20); when the connection plate (3) is in the third position, all of the connection holes (30) extend out of the first connection part (20).

5. The femoral stem prosthesis with an adjustable connecting plate according to claim 3, characterized in that: The connecting plate (3) is provided with a first wiring groove (31), and the first wiring groove (31) passes through the connecting hole (30); or The connecting plate (3) is provided with a first wiring groove (31) and a second wiring groove (32); the first wiring groove (31) and the second wiring groove (32) both pass through the connecting hole (30), and the second wiring groove (32) intersects with the first wiring groove (31).

6. The femoral stem prosthesis with an adjustable connecting plate according to claim 1, characterized in that: A sliding hole (200) is formed at one end of the first connecting portion (20) away from the femoral stem body (1), and the connecting plate (3) is vertically slidably installed in the sliding hole (200).

7. The femoral stem prosthesis with an adjustable connecting plate according to claim 6, characterized in that: An opening (201) is formed on the outer side of the first connecting portion (20), and the opening (201) is connected to the sliding hole (200). When the length of the connecting plate (3) extending out of the first connecting portion (20) is the smallest, the connecting plate (3) has a portion located within the opening (201), and the outer side surface of the portion of the connecting plate (3) located within the opening (201) is within the same arc surface as the outer side surface of the first connecting portion (20).

8. The femoral stem prosthesis with an adjustable connecting plate according to claim 7, characterized in that: The width of the opening (201) is smaller than the width of the sliding hole (200).

9. The femoral stem prosthesis with an adjustable connecting plate according to claim 1, characterized in that: A conical hole (202) is formed at one end of the first connecting portion (20) away from the connecting plate (3); the femoral stem body (1) comprises a connected conical connecting portion (10) and a stem body (11); the outer side surface of the conical connecting portion (10) contacts the inner side surface of the conical hole (202); the stem body (11) is located outside the conical hole (202), and also includes a fixing member (4) installed between the conical connecting portion (10) and the first connecting portion (20).

10. The femoral stem prosthesis with an adjustable connecting plate according to claim 1, characterized in that: When the femoral stem body (1) is installed on the first connecting portion (20), the total length L of the first connecting portion (20) and the femoral stem body (1) is 150 mm-240 mm.

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