Femoral stem system and hip joint prosthesis

Abstract

The application discloses a femoral stem system and a hip joint prosthesis, and relates to the technical field of medical devices, in particular to a femoral stem system and a hip joint prosthesis. The femoral stem system comprises a plurality of groups of femoral stems, wherein each group of femoral stems comprises at least one femoral stem; the femoral stem comprises a femoral neck and a stem body, the stem body is connected with the femoral neck, an included angle between an extension direction of the femoral neck and a central axis of the stem body is a neck-shaft angle, the stem body has oppositely arranged inner and outer sides, and a projection of the inner side on a coronal plane is an arc shape which is convex towards the outer side; the neck-shaft angle is X, a radius of the arc shape is Y, and the X and the Y satisfy the following relationship: Y=kX+b, wherein k is greater than 0 and less than or equal to 39, and b is greater than or equal to -4526 and less than or equal to 0. The femoral stem system has a reasonable structural design and is good in matching effect with a human body.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical equipment, in particular to a femoral stem system and a hip joint prosthesis. BACKGROUND

[0002] As an implant in hip arthroplasty in orthopedics today, the femoral stem is suitable for repairing and reconstructing diseases of the human hip joint. The femoral stem is usually implanted with the femoral head prosthesis to form a complete hip joint prosthesis together with the acetabular liner and the acetabular outer cup. The femoral stem is usually of two types, biological and cemented. The former has a biological outer surface that matches the bone of the femoral medullary cavity to form a bone interface, and the latter fills the medullary cavity with bone cement and then inserts the cemented femoral stem.

[0003] When using a biological femoral stem, the inner curvature of the proximal end of the femoral stem needs to match the curvature of the femoral medullary cavity to ensure good surgical results for the patient. However, the inner curvature of the proximal end of the femoral stem in the related art is not designed reasonably, cannot adapt to different patients, has a narrow application range, and has poor surgical results for the patient. SUMMARY

[0004] The present application aims to at least partially solve one of the technical problems in the related art.

[0005] To this end, an embodiment of the present application proposes a femoral stem system that has a reasonable structure design and good matching effect with the human body.

[0006] An embodiment of the present application also proposes a hip joint prosthesis.

[0007] The femoral stem system according to an embodiment of the present application comprises: a plurality of groups of femoral stems, wherein each group of femoral stems comprises at least one femoral stem; the femoral stem comprises a femoral neck and a stem body, the stem body is connected to the femoral neck, the included angle between the extension direction of the femoral neck and the central axis of the stem body is a neck-shaft angle, the stem body has oppositely arranged inner and outer sides, and the projection of the inner side on the coronal plane is an arc shape that protrudes toward the outer side; the neck-shaft angle is X, the radius of the arc shape is Y, and the X and the Y satisfy the function relationship Y=kX+b, the value range of k is greater than 0 and less than or equal to 39, and the value range of b is greater than or equal to -4526 and less than or equal to 0.

[0008] The femoral stem system according to an embodiment of the present application, since the neck-shaft angle X and the radius Y of the arc shape are within the above range and satisfy the function relationship Y=kX+b, different femoral stems with different inner curvatures can be selected for patients with different neck-shaft angles, so that the femoral stem has a high matching degree with the human femur, the structure design is reasonable, and the surgical effect is improved.

[0009] In some embodiments, the X has a range of values from 110° to 135°, the Y has a range of values from 75 mm to 145 mm; and / or, the k has a range of values from 2 to 5, the b has a range of values from -550 to -150.

[0010] In some embodiments, the femoral stem system includes two groups of femoral stems; the first group of femoral stems has a range of values for the k from 2.1 to 2.2, a range of values for the b from -186 to -154; the second group of femoral stems has a range of values for the k from 4.8 to 4.9, a range of values for the b from -549 to -470.

[0011] In some embodiments, the first group of femoral stems has a range of values for the X from 115° to 123.7°, a range of values for the Y from 79 mm to 89 mm; and / or, the first group of femoral stems has a range of values for the X from 115° to 123.7°, a value for the Y of 85 mm.

[0012] In some embodiments, the second group of femoral stems has a range of values for the X from 123.7° to 135°, a range of values for the Y from 104 mm to 127 mm; and / or, the second group of femoral stems has a range of values for the X from 123.7° to 135°, a value for the Y of 115 mm.

[0013] In some embodiments, the femoral stem system includes three groups of femoral stems; the first group of femoral stems has a range of values for the k from 3.1 to 3.3, a range of values for the b from -313 to -277; the second group of femoral stems has a range of values for the k from 3.5 to 3.6, a range of values for the b from -369 to -353; the third group of femoral stems has a range of values for the k from 4.5 to 4.6, a range of values for the b from -497 to -453.

[0014] In some embodiments, the first group of femoral stems has a range of values for the X from 114° to 120°, a range of values for the Y from 76 mm to 86 mm; and / or, the first group of femoral stems has a range of values for the X from 114° to 120°, a value for the Y of 81 mm.

[0015] In some embodiments, the X of the second group of femoral stems ranges from greater than 120° to less than or equal to 127°, and the Y ranges from greater than or equal to 87 mm to less than or equal to 103 mm; and / or, the X of the second group of femoral stems ranges from greater than 120° to less than or equal to 127°, and the Y is 95 mm.

[0016] In some embodiments, the X of the third group of femoral stems ranges from greater than 127° to less than or equal to 135°, and the Y ranges from greater than or equal to 119 mm to less than or equal to 144 mm; and / or, the X of the third group of femoral stems ranges from greater than 127° to less than or equal to 135°, and the Y is 132 mm.

[0017] According to another embodiment of the present application, a hip joint prosthesis comprises: a femoral stem system, the femoral stem system being any one of the femoral stem systems described in the embodiments of the present application; a ball head mounted on the femoral neck; an acetabular cup pivotably matched with the ball head.

[0018] According to the hip joint prosthesis of the embodiments of the present application, since the neck-stem angle X and the radius Y of the arc are within the above ranges and satisfy the function relationship Y=kX+b, the femoral stem with different medial arc can be selected for patients with different neck-stem angles, so that the hip joint prosthesis has high matching degree with the human femur, the structure design is reasonable, and the surgical effect is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a schematic view of a femoral stem of the femoral stem system of the embodiments of the present application.

[0020] Figure 2 is a schematic view of the installation of the femoral stem and the ball head of the femoral stem system of another embodiment of the present application.

[0021] Figure 3 is a schematic view of the installation of the femoral stem and the ball head of the femoral stem system of another embodiment of the present application.

[0022] Figure 4 is a schematic view of the installation of the femoral stem with medial arc greater than the medial arc of the human bone.

[0023] Figure 5 is a schematic view of the installation of the femoral stem with medial arc close to the medial arc of the human bone.

[0024] Figure 6 is a schematic view of the installation of the femoral stem with medial arc less than the medial arc of the human bone.

[0025] REFERENCE SIGNS:

[0026] 1. Femoral stem; 11. Femoral neck; 12. Stem body; 121. Medial surface; 122. Lateral surface; 123. Groove; 124. Erect ridge;

[0027] 2. Ball head. Detailed Implementation

[0028] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0029] To better explain and illustrate the technical solutions of the present invention, the directions and other aspects involved in the present invention will be explained and described in conjunction with the conventional descriptive methods in the art.

[0030] In the fields of anatomy and medical devices, directions and planes such as internal, external, anterior, posterior, distal, proximal, sagittal, coronal, and cross-section have specific meanings and are well known to those skilled in the art. Unless otherwise specified, these terms refer to the meanings generally accepted by those skilled in the art.

[0031] Typically, when describing the human body, joints, or prostheses, three types of cross-sections are involved: the sagittal plane, the coronal plane, and the cross-section. The sagittal plane is a longitudinal section that divides the human body or joint into left and right parts from a left-right perspective. The median sagittal plane, passing through the center of the human body, divides the body into two equal parts. The coronal plane is a longitudinal section that divides the human body or joint into anterior and posterior parts from an anteroposterior perspective. The coronal plane is perpendicular to the sagittal plane. The cross-section is a plane parallel to the ground plane that divides the human body or joint into upper and lower parts. The cross-section is perpendicular to both the coronal and sagittal planes.

[0032] The following is a reference appendix. Figures 1 to 6 A femoral stem system and a hip joint prosthesis according to embodiments of the present invention are described.

[0033] like Figure 1 and Figure 2 As shown, the femoral stem system according to an embodiment of the present invention includes multiple sets of femoral stems, wherein each set of femoral stems includes at least one femoral stem 1. The femoral stem 1 includes a femoral neck 11 and a stem body 12, the stem body 12 being connected to the femoral neck 11, the angle between the extending direction of the femoral neck 11 and the central axis of the stem body 12 being the neck-shaft angle, and the stem body 12 having an inner surface 121 and an outer surface 122 arranged opposite to each other, the projection of the inner surface 121 on the coronal plane being an arc protruding towards the outer surface.

[0034] Wherein, the neck angle is X, the radius of the arc of the inner side 121 is Y, and X and Y satisfy: Y=kX+b, where the value of k is greater than 0 and less than or equal to 39, and the value of b is greater than or equal to -4526 and less than or equal to 0.

[0035] It can be understood that the definition of the medial curvature of the femoral stem 1 is that the medial curvature radius extends from the lower edge of the femoral neck 11 to the proximal junction of the stem body 12. The inventors have found through experimental research that the curvature fit between the femoral stem 1 and the human bone at the proximal end is very important. Among them, Figure 4 the installation diagram of the medial curvature of the femoral stem 1 being greater than the medial curvature of the human bone, Figure 5 the installation diagram of the medial curvature of the femoral stem 1 being similar to the medial curvature of the human bone, Figure 6 the installation diagram of the medial curvature of the femoral stem 1 being less than the medial curvature of the human bone. Therefore, the good curvature fit between the femoral stem 1 and the human bone can reduce the risk of proximal splitting during the operation, and can also generate more stress stimulation at the proximal end of the stem body 12, thereby reducing stress shielding and bone resorption, so as to obtain good postoperative effect.

[0036] The femoral stem 1 according to the embodiment of the application can select the femoral stem 1 with different medial curvatures for patients with different neck stem angles, so that the femoral stem 1 has a high matching degree with the human femur, and the structure design is reasonable, thereby improving the surgical effect.

[0037] Optionally, the value range of X is greater than or equal to 110° and less than or equal to 135°, and the value range of Y is greater than or equal to 75 mm and less than or equal to 145 mm. The inventors of the application have found through experimental research that when the femoral stem 1 of the femoral stem system of the embodiment of the application satisfies the above range, the selection of the femoral stem 1 is more accurate, and the waste caused by too many types of the femoral stem 1 is reduced. The femoral stem 1 selected in the above range has a high matching degree with the human femur, and the surgical effect is better.

[0038] Optionally, the value range of k is greater than 2 and less than or equal to 5, and the value range of b is greater than or equal to -550 and less than or equal to -150. For example, the value of k can be 2, 3, 4, or 5. The value of b can be -550, -450, -350, -250, or -150. The inventors of the application have found through experimental research that when k and b satisfy the above range, the selection of the femoral stem 1 is more accurate, and the waste caused by too many types of the femoral stem 1 is reduced.

[0039] In some embodiments, the femoral stem system includes a first group of femoral stems, a second group of femoral stems, and a third group of femoral stems.

[0040] Optionally, the first group of femoral stems has a value of k ranging from 3.1 to 3.3, and a value of b ranging from -313 to -277. The value of k can be 3.1, 3.13, 3.16, 3.19, 3.21, 2.26, or 3.3. For example, in an embodiment of the present application, k is 3.19. The value of b can be -313, -303, -293, -283, or -277.

[0041] The second group of femoral stems has a value of k ranging from 3.5 to 3.6, and a value of b ranging from -369 to -353. The value of k can be 3.5, 3.52, 3.54, 3.57, 3.58, or 3.6. For example, in an embodiment of the present application, k is 3.57. The value of b can be -369, -365, -360, -357, or -353.

[0042] The third group of femoral stems has a value of k ranging from 4.5 to 4.6, and a value of b ranging from -497 to -453. The value of k can be 4.5, 4.52, 4.54, 4.56, 4.58, or 4.6. For example, in an embodiment of the present application, k is 4.56. The value of b can be -497, -487, -477, -467, or -453.

[0043] It can be understood that each group of femoral stems corresponds to a different function relationship between X and Y. The inventors of the present application have found through experimental research that when the X and Y of different groups of femoral stems 1 correspond to different ranges of function relationship, the accuracy of the selection of the femoral stem 1 is higher, so that the arcuate fit between the femoral stem 1 and the human body bone at the proximal end is better, and the problem of intraoperative fracture and stress shielding can be reduced.

[0044] Optionally, the first group of femoral stems has a neck stem angle X ranging from 114° to 120°, and an arc radius ranging from 76 mm to 86 mm. For example, the value of the arc radius of the first group of femoral stems can be 76 mm, 78 mm, 81 mm, 83 mm, or 86 mm.

[0045] The second group of femoral stems has a neck stem angle X ranging from 120° to 127°, and an arc radius ranging from 87 mm to 103 mm. For example, the value of the arc radius of the second group of femoral stems can be 87 mm, 90 mm, 93 mm, 95 mm, 98 mm, 100 mm, or 103 mm.

[0046] The neck-cervix angle X of the third group of femoral stems ranges from greater than 127° to less than or equal to 135°, and the arc radius of the third group of femoral stems ranges from greater than or equal to 119 mm to less than or equal to 144 mm. For example, the arc radius of the third group of femoral stems can be 119 mm, 125 mm, 130 mm, 132 mm, 137 mm, 140 mm, or 144 mm.

[0047] The inventors of the present application have found through experimental research that by dividing the neck-cervix angle of the femoral stem 1 into the above three groups, and selecting the arc radius range of the above different specifications according to the neck-cervix angle range of different groups, the accuracy of the selection of the femoral stem 1 can be higher, so that the matching effect of the femoral stem 1 with the human body is better, and the intraoperative fracture and stress shielding problems can be reduced.

[0048] Preferably, the arc radius of the first group of femoral stems is 81 mm. The arc radius of the second group of femoral stems is 95 mm. The arc radius of the third group of femoral stems is 132 mm. The inventors of the present application have found through experimental research that when the above values are selected as the arc radius of the femoral stem 1 for different groups of femoral stems 1, the femoral stem 1 can meet the use requirements of most patients, and the problem of waste of prosthesis models is reduced.

[0049] In summary, the femoral stem 1 of the embodiments of the present application can be divided into three groups according to the neck-cervix angle range of different femoral stems 1, so as to select the inner arc radius range and the recommended inner arc radius value. The corresponding table is as follows:

[0050]

[0051] In other embodiments, the femoral stem system includes a first group of femoral stems and a second group of femoral stems.

[0052] Optionally, the first group of femoral stems has a k value ranging from greater than or equal to 2.1 to less than or equal to 2.2, and a b value ranging from greater than or equal to -186 to less than or equal to -154. The k value can be 2.1, 2.13, 2.16, 2.18, or 2.2. For example, in the embodiments of the present application, k is 2.13. The b value can be -186, -180, -170, -160, -150, or -154.

[0053] The second group of femoral stems has a k value ranging from greater than or equal to 4.8 to less than or equal to 4.9, and a b value ranging from greater than or equal to -549 to less than or equal to -470. The k value can be 4.82, 4.83, 4.86, 4.88, or 4.9. For example, in the embodiments of the present application, k is 4.83. The b value can be -549, -530, -510, -500, -480, or -470.

[0054] It can be understood that each group of femoral stems corresponds to a different function relationship of X and Y. The inventors of the present application have found through experimental research that when the X and Y of different groups of femoral stems 1 correspond to different ranges of function relationship, the accuracy of the selection of the femoral stem 1 is higher, so that the arc matching degree between the femoral stem 1 and the human body bone at the proximal end is better, and the intraoperative fracture and stress shielding problems can be reduced.

[0055] The neck stem angle X of the first group of femoral stems is greater than or equal to 115° and less than or equal to 123.7°, and the arc radius of the first group of femoral stems is greater than or equal to 79 mm and less than or equal to 89 mm. For example, the numerical value of the arc radius of the first group of femoral stems can be 79 mm, 82 mm, 85 mm, 87 mm, or 89 mm.

[0056] The neck stem angle X of the second group of femoral stems is greater than 123.7° and less than or equal to 135°, and the arc radius of the second group of femoral stems is greater than or equal to 104 mm and less than or equal to 127 mm. For example, the numerical value of the arc radius of the second group of femoral stems can be 104 mm, 107 mm, 110 mm, 115 mm, 120 mm, 123 mm, or 127 mm.

[0057] The inventors of the present application have found through experimental research that by dividing the neck stem angle of the femoral stem 1 into the above two groups, and selecting the arc radius range of the above different specifications according to the neck stem angle range of different groups, the accuracy of the selection of the femoral stem 1 is higher, so that the matching effect of the femoral stem 1 with the human body is better, and the intraoperative fracture and stress shielding problems can be reduced.

[0058] Preferably, the arc radius of the first group of femoral stems is 85 mm. The arc radius of the second group of femoral stems is 115 mm. The inventors of the present application have found through experimental research that when different groups of femoral stems 1 select the above numerical values as the arc radius of the femoral stem 1, the femoral stem 1 can meet the use requirements of most patients, and the problem of waste of prosthesis types is reduced.

[0059] In summary, the femoral stem 1 of the embodiment of the present application can be divided into two groups according to the neck stem angle range of different femoral stems 1, so as to select the medial arc radius range and the recommended medial arc radius value. The corresponding table is as follows:

[0060]

[0061] In some embodiments, the peripheral wall of the stem body 12 is provided with a coating, for example, a tantalum microporous coating. By providing a coating on the stem body 12, the corrosion resistance and biocompatibility of the stem body 12 can be enhanced, and a good condition for the growth of bone cells can be created. Further, the stem body 12 is provided with a groove 123, thereby increasing the contact area of the stem body 12 with the human femur, and the stability of the stem body 12 after installation can be improved, the probability of prosthesis loosening is reduced, and the service life of the femoral stem 1 is longer.

[0062] Alternatively, the stem body 12 can be a rectangular double-tapered stem. It can be understood that the cross section of the stem body 12 is generally rectangular, thereby preventing the stem body 12 from rotating in the femoral medullary cavity, and the stem body 12 has a double taper, thereby avoiding the problem of sinking of the stem body 12, and the reliability of the stem body 1 after installation is higher, and the service life is longer. In other embodiments, as shown in Figure 3 The stem body 12 is provided with a groove 123 and a vertical ridge 124 feature, and the stem body 12 has a groove 123 and a vertical ridge 124, which can increase the contact area of the stem body 12 with the human femur. Preferably, the vertical ridge 124 is 2-4, which can be embedded in the cancellous bone and play a role in stabilizing and fixing, and the distal lateral notch of the stem body 12 facilitates the implantation of the femoral stem. In other embodiments, the femoral stem can also be of other types.

[0063] According to another embodiment of the hip joint prosthesis of the present application, the hip joint prosthesis comprises a femoral stem 1, a ball head 2 and an acetabular cup (not shown), the femoral stem 1 is the femoral stem 1 of the femoral stem system of the embodiment of the present application, the ball head 2 is installed on the femoral neck 11, and the acetabular cup is pivotally connected with the ball head 2.

[0064] According to the hip joint prosthesis of the embodiment of the present application, since the neck-stem angle X and the radius Y of the arc are within the above range and satisfy the function relationship Y=kX+b, the femoral stem 1 with different medial arc degrees can be selected for patients with different neck-stem angles, the matching degree of the femoral stem 1 with the human femur is higher, the structure design is reasonable, and the surgical effect is improved.

[0065] In the description of the present application, it should be understood that the orientations or positional relationships 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" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0066] In addition, the terms "first", "second", etc. are used herein only to describe different instances, and do not imply or suggest relative importance or a number of the indicated technical features. Thus, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0067] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected or can communicate with each other; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0068] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0069] In the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present specification and the features of different embodiments or examples, without contradiction.

[0070] It is to be understood that the application is not limited in its application to the details of construction and arrangement of parts set forth in the description above. The application is capable of other embodiments and of being practiced or being carried out in various ways. Variations and modifications of the foregoing are within the scope of the present application. It is to be understood that the application includes all such variations and modifications. The application also includes all of the individual features mentioned or evident from the specification and / or drawings and all of the combinations or permutations of each field of the individual features. The application covers the following aspects and preferred embodiments.

Claims

1. A femoral stem system, characterized by, The femoral stem system comprises a plurality of groups of femoral stems, wherein each group of femoral stems comprises at least one femoral stem; The femoral stem comprises a femoral neck and a stem body, the stem body being connected to the femoral neck, an included angle between an extension direction of the femoral neck and a central axis of the stem body being a neck-stem angle, the stem body having oppositely arranged medial and lateral sides, a projection of the medial side on a coronal plane being an arc shape convex toward the lateral side; The neck-stem angle is X, a radius of the arc shape is Y, the X and the Y satisfy: Y=kX+b; The X has a value range of greater than or equal to 110° and less than or equal to 135°, and the Y has a value range of greater than or equal to 75 mm and less than or equal to 145 mm; The k has a value range of greater than 2 and less than or equal to 5, and the b has a value range of greater than or equal to -550 and less than or equal to -150.

2. The femoral stem system of claim 1, wherein, The femoral stem system comprises two groups of femoral stems; The k of the first group of femoral stems has a value range of greater than or equal to 2.1 and less than or equal to 2.2, and the b has a value range of greater than or equal to -186 and less than or equal to -154; the k of the second group of femoral stems has a value range of greater than or equal to 4.8 and less than or equal to 4.9, and the b has a value range of greater than or equal to -549 and less than or equal to -470.

3. The femoral stem system of claim 2, wherein, The X of the first group of femoral stems has a value range of greater than or equal to 115° and less than or equal to 123.7°, and the Y has a value range of greater than or equal to 79 mm and less than or equal to 89 mm; Or, the X of the first group of femoral stems has a value range of greater than or equal to 115° and less than or equal to 123.7°, and the Y has a value of 85 mm.

4. The femoral stem system of claim 2, wherein, The X of the second group of femoral stems has a value range of greater than 123.7° and less than or equal to 135°, and the Y has a value range of greater than or equal to 104 mm and less than or equal to 127 mm; Or, the X of the second group of femoral stems has a value range of greater than 123.7° and less than or equal to 135°, and the Y has a value of 115 mm.

5. The femoral stem system of claim 1, wherein, The femoral stem system comprises three groups of femoral stems; The k of the first group of femoral stems has a value range of greater than or equal to 3.1 and less than or equal to 3.3, the b has a value range of greater than or equal to -313 and less than or equal to -277; the k of the second group of femoral stems has a value range of greater than or equal to 3.5 and less than or equal to 3.6, the b has a value range of greater than or equal to -369 and less than or equal to -353; the k of the third group of femoral stems has a value range of greater than or equal to 4.5 and less than or equal to 4.6, and the b has a value range of greater than or equal to -497 and less than or equal to -453.

6. The femoral stem system of claim 5, wherein, The X of the first group of femoral stems has a value range of greater than or equal to 114° and less than or equal to 120°, and the Y has a value range of greater than or equal to 76 mm and less than or equal to 86 mm; Or, the X of the first group of femoral stems has a value range of greater than or equal to 114° and less than or equal to 120°, and the Y has a value of 81 mm.

7. The femoral stem system of claim 5, wherein, The X of the second group of femoral stems has a value range of greater than 120° and less than or equal to 127°, and the Y has a value range of greater than or equal to 87 mm and less than or equal to 103 mm; Or, the X of the second group of femoral stems has a value range of greater than 120° and less than or equal to 127°, and the Y has a value of 95 mm.

8. The femoral stem system of claim 5, wherein, the X of the third group of femoral stems has a range of values greater than 127° and less than or equal to 135°, and the Y has a range of values greater than or equal to 119 mm and less than or equal to 144 mm; or, the X of the third group of femoral stems has a range of values greater than 127° and less than or equal to 135°, and the Y has a value of 132 mm.

9. A hip joint prosthesis, characterized in that comprising: a femoral stem, the femoral stem being a femoral stem of the femoral stem system of any one of claims 1-8; a ball head mounted on the femoral neck; an acetabular cup pivotably engaged with the ball head.

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