A system for femoral neck screw cut-out failure detection and methods of use thereof

Abstract

The application discloses a system for femoral neck screw cut-out failure detection and a use method thereof. The system comprises a femoral head and neck replacement device, a femoral neck platform, a sleeve locking device, an angle measuring device, an electrical conductivity detection device, a base and a pressing device. The femoral head and neck replacement device comprises an external loading steel shell and a foam body, and the foam body is fixedly installed in the external loading steel shell. One end of a femoral neck screw to be detected is inserted into the foam body, and the other end is arranged on the femoral neck platform and the sleeve locking device. The sleeve locking device is installed on the base. The femoral neck platform is sleeved on the sleeve locking device. The femoral neck platform is provided with a supporting portion and a suspended portion, and the femoral head and neck replacement device is abutted on the supporting portion. The force direction of the pressing device is spaced apart from the axial direction of the femoral head and neck replacement device by an angle. The angle measuring device is connected to the femoral head and neck replacement device. The application can study the cut-out failure of different types of femoral neck screws.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical instrument mechanical detection device, and in particular to a system for femoral neck screw cutout failure detection and a use method thereof. BACKGROUND

[0002] Femoral neck screw has been continuously improved, so that the failure rate of intramedullary fixation is reduced, although the design is continuously improved, intramedullary fixation failure occurs from time to time. The most common mechanical failure of intertrochanteric fracture internal fixation is that the femoral neck screw cuts out the femoral head, so it is particularly important to compare the performance of different femoral neck screws against cutout when intertrochanteric fracture occurs, and select the femoral neck screw with the best cutout resistance.

[0003] At present, osteoporosis, unstable fracture, poor reduction, improper placement of femoral neck screw and other factors will affect the cutout failure rate of femoral neck screw. At present, the detection of femoral neck screw cutout failure mainly relies on clinical and cadaver specimen research. Clinical research has not been able to find significant differences between them, because the incidence of relevant incision is masked by the high variability of bone quality, fracture type, reduction quality and placement. Through laboratory research on cadaver specimens, it is limited by different preparation techniques, incomparable osteoporosis rates of different bone structures and the number of available cadavers. It is impossible to accurately determine the influence of different types of femoral neck screws on cutout failure. SUMMARY

[0004] The purpose of the present application is to provide a system for femoral neck screw cutout failure detection and a use method thereof, so as to solve the problem that the influence of different types of femoral neck screws on cutout failure cannot be accurately determined.

[0005] In one aspect, the following technical solution is adopted:

[0006] A system for femoral neck screw cutout failure detection, comprising a femoral head and neck replacement device, a femoral neck platform, a sleeve locking device, an angle measuring device, an electrical conductivity detection device, a base and a pressure applying device.

[0007] The femoral head and neck replacement device comprises an external loading steel shell and a foam body, the foam body is fixedly installed in the external loading steel shell; one end of the femoral neck screw to be tested is inserted into the foam body and has a spacing with the external loading steel shell, the other end is provided on the femoral neck platform and the sleeve locking device; the sleeve locking device is used for fixing and locking the femoral neck screw; the sleeve locking device is installed on the base.

[0008] The femoral neck platform sleeve is sleeved on the sleeve locking device; the femoral neck platform is a non-metal material, which is used for simulating the distal femoral section; the femoral neck platform is provided with a support portion and a suspended portion at one end of the femoral head and neck replacement device, and the femoral head and neck replacement device abuts against the support portion;

[0009] The pressure device is used for applying pressure to the external loading steel shell, and the force direction of the pressure device is spaced apart from the axial direction of the femoral head and neck replacement device; the angle measuring device is connected to the femoral head and neck replacement device, and is used for measuring the angle of the femoral head and neck replacement device in the test process, which is the angle of the femoral head and neck replacement device in the test process; the conductivity detection device is used for detecting whether the femoral neck screw and the external loading steel shell are in contact and conductive.

[0010] Optionally, the femoral head and neck replacement device further comprises a back plate; one side of the external loading steel shell is open; the back plate is in a circular shape, and is used for blocking the foam body in the external loading steel shell; the external loading steel shell is threadedly connected with a abutting bolt, and the end of the abutting bolt is provided with a rubber pad; the abutting bolt is arranged in the external loading steel shell and abuts against the foam body; the back plate is provided with an eccentric hole; the foam body is provided with an insertion hole for the femoral neck screw, and the insertion hole is coaxially arranged with the eccentric hole; the diameter of the insertion hole is the same as the diameter of the femoral neck screw, and the diameter of the eccentric hole is greater than the diameter of the femoral neck screw.

[0011] Optionally, the sleeve locking device comprises a sleeve, and the sleeve is mounted on the base; the sleeve is provided with a mounting hole along the axial direction thereof for inserting the femoral neck screw, and the diameter of the mounting hole is the same as the diameter of the femoral neck screw.

[0012] Optionally, the outer wall of the sleeve is provided with a locking hole communicated with the mounting hole, and the locking hole is symmetrically arranged in two rows along the circumference of the sleeve and is spaced apart along the length direction of the sleeve; three bolts pass through the corresponding locking holes and abut against the side wall of the femoral neck screw to be tested, and the abutting points of the three bolts and the femoral neck screw form a triangular structure.

[0013] Optionally, the end of the sleeve away from the base is provided with a hemispherical head structure; the bottom of the femoral neck platform is provided with a sleeving hole along the axial direction thereof, and the end of the sleeving hole away from the base is correspondingly provided with a hemispherical head recess structure for sleeving on the sleeve; and the femoral neck platform is locked on the sleeve by the bolts.

[0014] Optionally, the support portion is in a semicircular platform structure, and the center of the semicircular platform structure is located on the central axis of the femoral neck platform.

[0015] Optionally, the angle measuring device comprises an angle measuring instrument and a bracket, one end of the bracket is sleeved and fixed on the outer loading steel shell, and the bracket is parallel to the bottom of the outer loading steel shell; a steel sheet is arranged on the bracket, and the bottom of the angle measuring instrument is fixed on the steel sheet by magnet adsorption.

[0016] Optionally, the system further comprises a testing machine table, the base is installed in the testing machine table, and the testing machine table has an interactive platform; the conductivity detection device comprises a voltage stabilizer, the outer loading steel shell is connected with the voltage stabilizer through a wire, the femoral neck screw to be detected is connected with the interactive platform through a wire, and the interactive platform and the voltage stabilizer are connected in series; when the femoral neck screw is in contact with the outer loading steel shell, a circuit is conducted, an electric signal is fed back to the interactive platform, and the test is stopped.

[0017] Optionally, the testing machine table is provided with a force sensor and a displacement sensor for detecting the pressing force and the moving displacement of the pressing device.

[0018] On the other hand, the technical scheme is as follows:

[0019] A use method of a system for femoral neck screw cutting failure detection, comprising the following steps:

[0020] Step 1: The foam body is fixed in the outer loading steel shell by the abutting bolt with a rubber pad at the end, and the plug-in hole on the foam body is coaxial with the eccentric hole of the back plate, and the back plate is fixed between the outer loading steel shell by a bolt;

[0021] Step 2: The femoral neck screw to be detected is inserted into the foam body through the eccentric hole, and no gap is ensured between the femoral neck screw and the foam body;

[0022] Step 3: The bracket is locked and fixed on the outer loading steel shell, and it is ensured that the bracket is parallel to the back plate; the angle measuring instrument is installed on the bracket;

[0023] Step 4: The femoral neck platform is plugged on the sleeve, and the two are locked and fixed by a bolt;

[0024] Step 5: The sleeve is installed on the base, and the two are fixed by a bolt, and the base is fixed in the testing machine table;

[0025] Step 6: The end of the femoral neck screw to be detected away from the foam body is inserted into the sleeve, the back plate side wall abuts against the femoral neck platform, three bolts pass through the corresponding locking holes and abut against the side wall of the femoral neck screw to be detected, the abutting points of the three bolts and the femoral neck screw form a triangular structure, and the femoral neck screw is locked;

[0026] Step 7: The voltage stabilizer is connected with the outer loading steel shell through the wire, the femoral neck screw is connected with the interactive platform in the testing machine table through the wire, and the voltage stabilizer and the interactive platform are connected in series;

[0027] Step 8: The pressure device in the test machine applies pressure to the femoral head and neck replacement device. When the femoral neck screw is in contact with the external loading steel shell, the circuit is turned on, and an electrical signal is fed back to the interactive platform to stop the test; one test is completed.

[0028] In summary, the present application includes the following advantages:

[0029] 1. The scheme of the present application can replace new foams of the same kind after each test and replace femoral neck screws of different kinds for the next test, which can detect and study the cutting failure of femoral neck screws of different kinds, detect the pressure, displacement, axial rotation angle, varus angle and fatigue cycle of the femoral head and neck replacement device; the test conditions of the whole system are low, the feasibility is high, it has high practicality, the test results are accurate, and it has wide applicability; it overcomes the current stage mainly based on clinical and autopsy tests, which consumes time and effort, and the test quality is affected by different degrees of osteoporosis, unstable fracture, poor reduction, improper placement of femoral neck screws, etc.

[0030] 2. The detection circuit is formed by connecting the stabilizer, the external loading steel shell, the femoral neck screw and the interactive platform in the test machine; the cutting condition of the femoral neck screw can be accurately judged. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a schematic diagram of the overall structure of the embodiment;

[0032] Figure 2 is a schematic diagram of the femoral head and neck replacement device in the embodiment;

[0033] Figure 3 is a schematic diagram of the angle measuring device in the embodiment;

[0034] Figure 4 is a schematic diagram of the femoral neck platform in the embodiment;

[0035] Figure 5 is a schematic diagram of the sleeve locking device in the embodiment;

[0036] Figure 6 is a schematic diagram of the base in the embodiment.

[0037] Explanation of reference numerals: 1, femoral head and neck replacement device; 11, external loading steel shell; 12, back plate; 13, foam body; 14, eccentric hole; 15, abutting bolt; 2, femoral neck platform; 21, support portion; 22, overhanging portion; 23, sleeve joint hole; 24, through hole; 3, sleeve locking device; 31, sleeve; 32, mounting hole; 33, locking hole; 34, threaded hole; 4, angle measuring device; 41, angle measuring instrument; 42, support table; 43, steel sheet; 5, base; 51, inclined surface; 52, annular step; 6, pressure applying device; 7, testing machine table. DETAILED DESCRIPTION

[0038] The following will be described in detail below with reference to the accompanying drawings. Figures 1-6 The present application will be further described in detail.

[0039] With reference to Figure 1 , the present application discloses a system for detecting femoral neck screw cutting failure, which comprises a femoral head and neck replacement device 1, a femoral neck platform 2, a sleeve locking device 3, an angle measuring device 4, an electrical conductivity detection device, a base 5, a pressure applying device 6, and a testing machine table 7. Each device is installed in the testing machine table 7 for testing.

[0040] With reference to Figure 2 , the femoral head and neck replacement device 1 comprises an external loading steel shell 11 and a foam body 13. One end of the femoral neck screw to be tested is inserted into the foam body 13 and spaced apart from the external loading steel shell 11, and the other end is provided through the femoral neck platform 2 and the sleeve locking device 3. The sleeve locking device 3 is used to fix and lock the femoral neck screw. The sleeve locking device 3 is installed on the base 5.

[0041] The femoral neck platform 2 is sleeved on the sleeve locking device 3. The femoral neck platform 2 is made of non-metallic material and is used to simulate the distal end section of the femur. The femoral neck platform 2 is provided with a support portion 21 and an overhanging portion 22 at one end facing the femoral head and neck replacement device 1, and the lower end surface of the femoral head and neck replacement device 1 abuts against the support portion 21.

[0042] The pressure applying device 6 is used to apply pressure to the femoral head and neck replacement device 1. The force direction of the pressure applying device 6 is spaced apart from the axial direction of the femoral head and neck replacement device 1 by an angle, so that the femoral head and neck replacement device 1 rotates inwardly and rotates axially along the femoral neck screw. The angle measuring device 4 is connected to the femoral head and neck replacement device 1 and is used to measure the angles of the inward rotation and the axial rotation of the femoral head and neck replacement device 1 during the test. The electrical conductivity detection device is used to detect whether the femoral neck screw and the external loading steel shell 11 are in contact and conductive.

[0043] Specifically, with reference to Figure 2The femoral head and neck replacement device 1 further comprises a back plate 12, and one end of the outer loaded steel shell 11 has an opening towards the femoral neck platform 2. The back plate 12 is circular in shape and is used to block the foam body 13 in the outer loaded steel shell 11. The back plate 12 is provided with an eccentric hole 14, and in this embodiment, the eccentricity of the eccentric hole 14 is set to 7mm. The back plate 12 can be made of a non-conductive material, or an insulating layer can be provided on the inner wall of the eccentric hole 14 to prevent the femoral neck screw from conducting to the outer loaded steel shell 11 through the back plate 12.

[0044] The foam body 13 is provided with a plug-in hole corresponding to the plug-in hole. When the foam body 13 is installed, the plug-in hole is coaxially arranged with the eccentric hole 14, that is, the axis of the plug-in hole is offset from the axis of the entire foam body 13 by 7mm, and the top end of the plug-in hole is 12.2mm away from the top center of the inner wall of the outer loaded steel shell 11, that is, the TAD is 12.2mm. The outer periphery of the outer loaded steel shell 11 is provided with a threaded tightening bolt 15, and the end of the tightening bolt 15 is provided with a silica gel pad for tightly pressing the foam body 13 to reduce the relative rotation between the foam body 13 and the outer loaded steel shell 11.

[0045] The diameter of the eccentric hole 14 is greater than the diameter of the femoral neck screw, and the diameter of the plug-in hole is the same as the diameter of the femoral neck screw. One end of the femoral neck screw is inserted into the plug-in hole of the foam body 13 after passing through the eccentric hole 14, so as to ensure that there is no gap between the femoral neck screw and the plug-in hole. According to the performance of the cancellous bone of the femur to be studied, the foam body 13 can be made of polyurethane foam, and the foam body 13 with appropriate density and hardness is selected.

[0046] Referring to Figure 3 , the angle measuring device 4 comprises an angle measuring instrument 41 and a supporting table 42. One end of the supporting table 42 is sleeved on the outer loaded steel shell 11 through a clasp ring structure with an opening, and is locked and fixed on the outer loaded steel shell 11 through a bolt clasp ring opening, so that the supporting table 42 is parallel to the bottom of the outer loaded steel shell 11. The other end is provided with a groove, and a steel sheet 43 is fixed in the groove by glue. The supporting table 42 is made of non-metallic material to prevent the electric conductivity detection device from affecting the angle measuring instrument 41 when a path is formed. The bottom of the angle measuring instrument 41 is provided with a magnet for adsorbing and fixing on the steel sheet 43, and the two adjacent edges of the angle measuring instrument 41 abut against the two adjacent inner edges of the groove to ensure the measurement accuracy of the angle measuring instrument 41. During the entire experiment, the angle measuring instrument 41 is used to measure the angle of inversion and rotation of the femoral head and neck replacement device 1, and a batch of angle and time data is collected for subsequent data analysis.

[0047] Referring to Figure 4The support part 21 on the femoral neck platform 2 is in a semicircular platform structure, the center of the semicircular platform structure is located on the axis of the femoral neck platform 2, and the diameter line of the semicircular platform structure is in the same plane as the axis of the eccentric hole 14 and perpendicular to each other, so as to realize the simulation of the position of the femoral neck screw in the human body centering to the side. The bottom of the femoral neck platform 2 is provided with a sleeve joint hole 23 along the axial direction, and the sleeve joint hole 23 is in a hemispherical groove structure at one end close to the semicircular platform structure. Two through holes 24 are symmetrically provided on the circumferential side of the femoral neck platform 2. The femoral neck platform 2 is made of polyethylene material, which has high strength, smooth surface and small noise during the test. The setting of the support part 21 and the overhanging part 22 makes the back plate 12 abut on the semicircular platform structure. The pressure device 6 applies downward force to the femoral head and neck replacement device 1, which can allow the femoral head and neck replacement device 1 to rotate inwards and axially, and does not allow the femoral head and neck replacement device 1 to translate axially, so as to simulate the movement mode between the proximal femur and the fracture surface after reduction is completed.

[0048] Referring to Figure 5 The sleeve locking device 3 includes a sleeve 31, which is provided with a mounting hole 32 for inserting the femoral neck screw along the axial direction, and the diameter of the mounting hole 32 is the same as that of the femoral neck screw. According to the type of the femoral neck screw to be tested, a suitable sleeve 31 is selected. The outer wall of the sleeve 31 is symmetrically provided with two rows of locking holes 33, each row of locking holes 33 is provided with three locking holes 33 spaced apart along the length direction of the sleeve 31, and the axis of each locking hole 33 is perpendicular to the axis of the sleeve 31.

[0049] The end of the sleeve 31 facing the femoral head and neck replacement device 1 is provided with a hemispherical head structure, and the femoral neck platform 2 is sleeved on the outer wall of the sleeve 31 through the sleeve joint hole 23. Two through holes 24 are symmetrically provided on the circumferential side of the femoral neck platform 2, and after the bolts pass through the through holes 24, they are inserted into the locking holes 33 of the sleeve 31 to lock the femoral neck platform 2 on the sleeve 31.

[0050] Among the two rows of locking holes 33, the two symmetric locking holes 33 at the uppermost end are used to lock the femoral neck platform 2. Among the remaining four locking holes 33 in the two rows of locking holes 33, three bolts are respectively inserted into the corresponding three locking holes 33 to lock the femoral neck screw. The connecting line of the abutting points of the three bolts and the femoral neck screw forms a triangular structure, so that the femoral neck screw and the sleeve 31 are more firmly connected.

[0051] Referring to Figure 6The sleeve 31 is mounted on the base 5, and the base 5 is fixed on the testing machine table 7 through bolts on both sides. The bottom of the sleeve 31 is provided with a threaded hole 34 along the axial direction, the threaded hole 34 is communicated with the mounting hole 32, and the diameter of the threaded hole 34 is larger than that of the mounting hole 32. The base 5 is provided with an inclined surface 51, and the angle between the inclined surface 51 and the horizontal plane is 31° in this embodiment, and the sleeve 31 is perpendicular to the inclined surface 51. The base 5 is provided with a connecting hole in the direction perpendicular to the inclined surface 51, and the base 5 is coaxially provided with a fixed hole communicated with the connecting hole, and the diameter of the fixed hole is larger than that of the connecting hole, so that the intersection of the fixed hole and the connecting hole forms an annular step 52. The sleeve 31 is inserted into the connecting hole, and then the bolt is inserted into the threaded hole 34 of the sleeve 31 from the fixed hole of the base 5; when the head of the bolt abuts against the annular step 52, the fixing and locking of the sleeve 31 is completed.

[0052] The testing machine table 7 also has an interactive platform, which is used to control whether the test is performed or not. The conductivity detection device includes a voltage stabilizer, the external loading steel shell 11 is connected with the voltage stabilizer through a wire, and the femoral neck screw to be measured is connected with the interactive platform through a wire, and the interactive platform and the voltage stabilizer are connected in series; when the femoral neck screw contacts the external loading steel shell 11 for a moment, the circuit is conducted, an electrical signal is fed back to the interactive platform, the interactive platform sends a control instruction, and the test is stopped.

[0053] The testing machine table 7 has a force sensor and a displacement sensor, which are used to detect the pressing force and displacement of the pressing device 6. The whole set of test equipment can detect the pressure, displacement, axial rotation angle, varus angle and fatigue cycle of the femoral head neck replacement device 1 in the femoral neck screw cutting failure test process.

[0054] The application also discloses a use method of a system for femoral neck screw cutting failure detection, which comprises the following steps:

[0055] Step 1: The foam body 13 is fixed in the external loading steel shell 11 through the abutting bolt 15 with a rubber pad at the end, and the plug-in hole on the foam body 13 is coaxial with the eccentric hole 14 of the back plate 12, and the back plate 12 is fixed between the external loading steel shell 11 through bolts;

[0056] Step 2: The femoral neck screw to be measured is inserted into the foam body 13 through the eccentric hole 14, and it is ensured that there is no gap between the femoral neck screw and the foam body 13.

[0057] Step 3: The support table 42 is locked and fixed on the external loading steel shell 11, and it is ensured that the support table 42 is parallel to the back plate 12; the angle measuring instrument 41 is installed on the support table 42;

[0058] Step 4: The femoral neck platform 2 is plugged into the sleeve 31, and the two are locked and fixed through bolts;

[0059] Step 5: Install sleeve 31 on base 5, and fix them by bolts, base 5 is fixed in testing machine 7;

[0060] Step 6: Insert the femoral neck screw to be tested into sleeve 31 from the end away from foam 13, back plate 12 abuts against the platform 2 of the femoral neck, and fix the femoral neck screw by three bolts through corresponding locking holes 33, the three bolts form a triangular structure with the contact points of the femoral neck screw, and the femoral neck screw is locked;

[0061] Step 7: Connect the voltage stabilizer to the external loading steel shell 11 by wires, and connect the femoral neck screw to the interactive platform in the testing machine 7 by wires, and connect the voltage stabilizer and the interactive platform in series;

[0062] Step 8: Apply pressure to the femoral head and neck replacement device 1 by the pressure applying device 6 in the testing machine 7, when the femoral neck screw contacts the external loading steel shell 11, the circuit is turned on, and an electrical signal is fed back to the interactive platform to stop the test; one test is completed.

[0063] Among them, foam 13 and femoral neck screw are variable; after one test, a single variable is controlled, and more accurate test results can be obtained; the whole system is easy to operate, simple and convenient, and is convenient for obtaining a large amount of data for scientific research and comparative analysis.

[0064] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, therefore: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A system for detecting femoral neck screw cutout failure, characterized by: It includes a femoral head and neck replacement device, a femoral neck platform, a sleeve locking device, an angle measuring device, an electrical conductivity detection device, a base, and a pressure device; The femoral head and neck replacement device includes an external loading steel shell and a foam body, wherein the foam body is fixedly installed in the external loading steel shell; one end of the femoral neck screw to be tested is inserted into the foam body with a gap between it and the external loading steel shell, and the other end is inserted into the femoral neck platform and the sleeve locking device; the sleeve locking device is used to fix and lock the femoral neck screw; the sleeve locking device is installed on the base; The femoral neck platform is sleeved on the sleeve locking device; the femoral neck platform is made of non-metallic material and is used to simulate the distal femoral cross-section; the femoral neck platform is provided with a support portion and a suspended portion at one end facing the femoral head and neck replacement device, and the femoral head and neck replacement device abuts against the support portion; The pressure-applying device is used to apply pressure to the external loading steel shell, and the force direction of the pressure-applying device is at an axial spacing angle with the femoral head and neck replacement device; the angle measuring device is connected to the femoral head and neck replacement device, and is used to measure the angles of the femoral head and neck replacement device toward the suspended part during the test; the conductivity detection device is used to detect whether there is contact and conduction between the femoral neck screw and the external loading steel shell; the femoral head and neck replacement device also includes a backing plate; one side of the external loading steel shell is open; the backing plate is circular in shape, and is used to seal the foam body in the external loading steel shell; a tightening bolt is threadedly connected to the external loading steel shell, and a rubber pad is provided at the end of the tightening bolt, and the tightening bolt is passed through the external loading steel shell and tightened on the foam body; an eccentric hole is provided on the backing plate; the foam body is provided with a plug-in hole for inserting the femoral neck screw, and the plug-in hole is coaxially arranged with the eccentric hole; the diameter of the plug-in hole is the same as the diameter of the femoral neck screw, and the diameter of the eccentric hole is larger than the diameter of the femoral neck screw.

2. A system for detecting femoral neck screw cutout failure according to claim 1, characterized in that: The sleeve locking device comprises a sleeve which is mounted on a base. The sleeve is provided with a mounting hole for inserting a femoral neck screw along its axial direction, and the diameter of the mounting hole is the same as that of the femoral neck screw.

3. The system for detecting femoral neck screw cutout failure according to claim 2, characterized in that: The outer wall of the sleeve is provided with a locking hole connected to the mounting hole, and the locking holes are symmetrically arranged in two rows along the circumference of the sleeve and are spaced apart along the length direction of the sleeve; three bolts pass through the corresponding locking holes and are tightened against the side wall of the femoral neck screw to be tested, and the lines connecting the contact points of the three bolts and the femoral neck screw form a triangular structure.

4. The system for detecting femoral neck screw cutout failure according to claim 3, characterized in that: A hemispherical head structure is provided at one end of the sleeve away from the base; a socket hole is provided along the axial direction of the bottom of the femoral neck platform, and a hemispherical head groove structure is correspondingly provided at one end of the socket hole away from the base for socketing on the sleeve; the femoral neck platform is locked on the sleeve by bolts.

5. The system for detecting femoral neck screw cutout failure according to claim 1, characterized in that: The support portion is in the form of a semicircular platform structure, the center of which is located on the central axis of the femoral neck platform.

6. The system for detecting femoral neck screw cutout failure according to claim 1, characterized in that: The angle measuring device includes an angle measuring instrument and a support. One end of the support is sleeved and fixed on the external loading steel shell, and the support is parallel to the bottom of the external loading steel shell. A steel sheet is provided on the support, and the bottom of the angle measuring instrument is fixed on the steel sheet by magnet adsorption.

7. The system for detecting femoral neck screw cutout failure according to claim 1, characterized in that: The system also includes a test machine, the base of which is installed in the test machine, and the test machine has an interactive platform. The conductivity detection device includes a voltage stabilizer, the external loading steel shell is connected to the voltage stabilizer via a wire, the femoral neck screw to be tested is connected to the interactive connection via a wire, and the interactive platform and the voltage stabilizer are connected in series. When the femoral neck screw contacts the external loading steel shell, the circuit is turned on and an electrical signal is fed back to the interactive platform to stop the test.

8. The system for detecting femoral neck screw cutout failure according to claim 7, characterized in that: The test machine is provided with a force sensor and a displacement sensor for detecting the downward force and movement displacement of the pressure device.

9. A method for using a system for detecting femoral neck screw cutout failure, characterized in that: A system for detecting femoral neck screw cutout failure according to claims 1 to 8; The following steps are involved: Step 1: The foam body is fixed in the external loading steel shell by tightening bolts with rubber pads at the ends, and the plug hole on the foam body is coaxial with the eccentric hole of the back plate. The back plate and the external loading steel shell are fixed with bolts; Step 2: Insert the femoral neck screw to be tested into the foam body through the eccentric hole, and ensure that there is no gap between the femoral neck screw and the foam body; Step 3: Lock the support onto the external loading steel shell and ensure that the support is parallel to the back plate; install the angle measuring instrument on the support; Step 4: Insert the femoral neck platform into the sleeve and fasten the two together with bolts; Step 5: Install the sleeve on the base and fix the two with bolts. Fix the base in the test machine. Step 6: Insert the end of the femoral neck screw to be tested away from the foam body into the sleeve, and press the side wall of the back plate against the femoral neck platform. Pass three bolts through the corresponding locking holes and press them against the side wall of the femoral neck screw to be tested. The lines connecting the contact points of the three bolts and the femoral neck screw form a triangle structure, and lock the femoral neck screw. Step 7: Connect the voltage regulator to the external loading steel shell through wires, connect the femoral neck screw to the interactive platform in the test machine through wires, and connect the voltage regulator and the interactive platform in series; Step 8: The pressure device in the test machine applies pressure to the femoral head and neck substitute device. When the femoral neck screw contacts the external loading steel shell, the circuit is connected and an electrical signal is fed back to the interactive platform to stop the test; thus, one test is completed.

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