Femoral condyle AP measuring device

Abstract

The invention relates to a femoral condyle AP measuring device, which can accurately measure the anterior and posterior dimensions of the femoral condyle, limit the osteotomy dimensions and assist in positioning an osteotomy plate.

Description

Technical Field

[0001] The invention relates to a medical device for orthopedic surgery, in particular to a femoral condyle AP measuring device used in knee replacement surgery. Background Art

[0002] Artificial knee replacement is a plastic surgery that uses artificial biological materials to replace diseased joints in the human body and restore the normal physiological function of the knee joint. During the operation, the doctor needs to perform a characteristic osteotomy on the patient's knee joint to match the artificial joint prosthesis and restore the optimal stable shape of the knee joint.

[0003] After the distal femoral osteotomy, AP-Sizer is usually used to obtain the size of the femoral condyle corresponding to the artificial knee joint and perform osteotomy positioning. The doctor can determine the external rotation angle of the femoral condyle and the osteotomy position based on preoperative planning and intraoperative instrument measurement.

[0004] In total knee replacement surgery, the accuracy of femoral internal and external rotation osteotomy is of great significance to the stability of the knee joint.

[0005] The femoral condyle AP (anteroposterior condyle dimension) measuring devices currently used in artificial knee replacements and capable of performing the same function are divided into two categories. One category is active, which uses GPS navigation to determine the osteotomy angle and corresponding position. Since this type of instrument introduces electrical signals, its tools are Class II medical devices, which have moderate risks and require strict management to ensure their safety and effectiveness. Therefore, this type of product is more expensive and cannot be reused. In addition, since it requires initial positioning, it also increases the operating requirements for doctors during surgery.

[0006] The other type is passive, which uses mechanical methods to measure the size of the femoral condyle and determine the internal and external rotation angles of the femoral condyle. It is a Class I device, and its safety and effectiveness can usually be guaranteed by management control. Its production cost is relatively low, its stability is high, and it can be reused.

[0007] For Class I passive instruments, it is necessary to measure the size of the femoral condyle and confirm the rotation angle of the femoral condyle to assist the doctor in the subsequent osteotomy operation. However, such instruments usually have the risk of small rotation angle configuration range, large angle error, small and difficult to identify marks, and unstable internal and external rotation angle fixation, which is easy to change, resulting in preoperative planning or doctor's manual operation can not get the expected results.

[0008] Therefore, the accurate and practical measurement of the femoral condyle external rotation osteotomy angle has always been a problem that technicians in this field hope to solve. Summary of the invention

[0009] In order to solve at least one of the problems existing in the above-mentioned prior art, the present invention proposes a femoral condyle AP measuring device, which comprises:

[0010] a base frame including a base configured to abut against a posterior condyle of a femoral condyle to be measured and a measurement post extending upwardly from the base;

[0011] a driving measuring device comprising a driving side frame, a measuring side frame fixedly connected to the driving side frame, a scale having a height scale fixedly connected to the measuring side frame and extending upward therefrom, a pointer fixedly connected to the measuring side frame and extending downward therefrom, and an indicating disk having an angle scale pivotally connected to the pointer at the rear of the pointer, wherein the driving side frame includes a worm screw laterally disposed therein and rotatable relative thereto, and the measuring side frame is configured to receive a measuring column and allow the measuring column to slide relative thereto in a vertical direction;

[0012] a transmission pivotally connected to the drive measuring device, comprising an osteotomy plate positioning block, a worm wheel extending downward from the osteotomy plate positioning block and meshing with the worm, and a positioning column extending upward from the osteotomy plate positioning block, wherein the worm wheel is configured to drive the indicator disk to rotate relative to the pointer; and

[0013] The probe disposed on the positioning post is configured to be movable relative to the positioning post in a direction perpendicular to the extending direction of the positioning post.

[0014] According to a feasible embodiment of the present invention, the transmission device includes a driving gear coaxial with the worm gear and capable of rotating synchronously with the worm gear, and a driven gear fixedly connected to the indicator disc and coaxial with the indicator disc is provided at the rear of the indicator disc, wherein

[0015] The driving gear meshes with the driven gear and is configured to drive the driven gear to rotate, and a transmission ratio between the two is less than 1.

[0016] According to a possible embodiment of the present invention, the driving gear is connected to the osteotomy plate positioning block through a pair of cantilevers, wherein the pair of cantilevers are separated from each other in a lateral direction so that the measuring side frame is received therebetween.

[0017] According to a feasible implementation manner of the present invention, marks indicating the rotation direction of the osteotomy plate positioning block are provided on the indicator disk, i.e., a mark L indicating the rotation direction to the left and a mark R indicating the rotation direction to the right, and the angle scale indicating the rotation angle of the osteotomy plate positioning block is evenly distributed on the indicator disk within the angle range of 0-360°.

[0018] According to a feasible embodiment of the present invention, the probe comprises:

[0019] a horizontal portion slidably mounted on the positioning column;

[0020] An inclined portion that slopes downward from the horizontal portion; and

[0021] A tip is provided at a lower end of the inclined portion and is configured to abut against an anterior condyle of the femoral condyle.

[0022] According to a feasible embodiment of the present invention, the horizontal part includes a first guide rail, a second guide rail spaced apart from the first guide rail, and a mounting opening arranged at the end of the first guide rail, wherein the first guide rail and the second guide rail are located on both sides of the groove at the upper end of the positioning column and can be slidably inserted into the groove, and the mounting opening is configured to install the probe to the positioning column or remove the probe from the positioning column.

[0023] According to a possible embodiment of the present invention, the driving side frame includes a knob disposed on an exterior thereof, and the knob is configured to rotate the worm.

[0024] According to a feasible implementation manner of the present invention, a pair of osteotomy plate positioning holes are provided on the osteotomy plate positioning block.

[0025] According to a possible implementation of the present invention, the measuring column comprises a protrusion disposed on a side wall thereof and located above the measuring side frame, and the protrusion is configured to prevent the measuring column from being separated from the measuring side frame.

[0026] According to a possible embodiment of the present invention, the base comprises a pair of claws in the form of thin plates extending rearwardly therefrom, and the pair of claws are configured to abut against the posterior condyle of the femoral condyle.

[0027] The present invention can be embodied as the exemplary embodiments in the accompanying drawings. However, it should be noted that the drawings are only exemplary, and any changes conceived under the teachings of the present invention should be considered to be included in the scope of the present invention, and the scope of the present invention is limited only by the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings illustrate exemplary embodiments of the present invention. These accompanying drawings should not be interpreted as necessarily limiting the scope of the present invention. The same numbers and / or similar reference numerals throughout the text may refer to the same and / or similar elements.

[0029] Figure 1 is a schematic stereoscopic diagram of a femoral condyle AP measuring device according to a feasible embodiment of the present invention;

[0030] Figure 2 is a schematic stereoscopic diagram of a femoral condyle AP measuring device according to a feasible embodiment of the present invention;

[0031] Figure 3 is a schematic stereoscopic diagram of a femoral condyle AP measuring device according to a feasible embodiment of the present invention;

[0032] Figure 41 is a schematic cross-sectional view of a femoral condyle AP measuring device according to a possible embodiment of the present invention, taken on a vertical plane passing through the pivot axis of the osteotomy plate positioning block. DETAILED DESCRIPTION

[0033] The present invention will now be described in more detail with reference to the accompanying drawings, in which exemplary embodiments of the present invention are shown. However, the present invention may be implemented in many different forms and should not be construed as necessarily being limited to the exemplary embodiments disclosed herein. On the contrary, these exemplary embodiments are merely provided to illustrate the present invention and to convey the concept of the present invention to those skilled in the art.

[0034] Figure 1 4 is a schematic stereoscopic diagram of a femoral condyle AP measuring device according to a possible embodiment of the present invention. Figure 2 4 is a schematic stereoscopic diagram of a femoral condyle AP measuring device according to a possible embodiment of the present invention. Figure 3 4 is a schematic stereoscopic diagram of a femoral condyle AP measuring device according to a possible embodiment of the present invention. Figure 4 It is a schematic cross-sectional view of a femoral condyle AP measuring device according to a feasible embodiment of the present invention, taken on a vertical plane passing through the pivot axis of the osteotomy plate positioning block. In addition, it should be noted that, in order to facilitate a better understanding of the present invention, in each of the drawings, arrow XX' indicates a transverse direction, also known as a length direction, wherein arrow X indicates the left side and arrow X' indicates the right side; arrow YY' indicates a vertical direction, also known as a height direction, wherein arrow Y indicates the upper side and arrow Y' indicates the lower side; and arrow ZZ' indicates anterior-posterior direction, also known as a thickness direction, wherein arrow Z indicates a direction facing the operator during the use of the femoral condyle AP measuring device of the present invention (i.e., the front, the front, etc.), and arrow Z' indicates a direction facing the femoral condyle to be measured during the use of the femoral condyle AP measuring device of the present invention (i.e., the rear, the rear, etc.); the transverse direction XX' and the anterior-posterior direction ZZ' jointly define a horizontal plane, and any direction parallel to the horizontal plane can be referred to as a horizontal direction. However, it should be noted that the above definition of orientation is only given for better illustrating the present invention and should not be construed as limiting the scope of the present invention in any way.

[0035] refer to Figure 1 and Figure 2The femoral condyle AP measuring device of the present invention comprises: a base frame 100, which comprises a base 110 configured to abut against the posterior condyle of the femoral condyle to be measured and a measuring column 120 extending upward from the base 110; a driving measuring device 200, which comprises a driving side frame 210, a measuring side frame 220 fixedly connected to the driving side frame 210, a scale 230 with a height scale fixedly connected to the measuring side frame 220 and extending upward therefrom, a pointer 240 fixedly connected to the measuring side frame 220 and extending downward therefrom, and an indicating plate 250 with an angle scale pivotally connected to the pointer 240 at the rear of the pointer 240, wherein the driving side frame 210 comprises a measuring column 120 arranged laterally therein. The measuring side frame 220 is configured to receive the measuring column 120 and allow the measuring column 120 to slide relative to it in a vertical direction; the transmission device 300 is pivotally connected to the driving measuring device 200, which includes an osteotomy plate positioning block 310, a worm wheel 320 extending downward from the osteotomy plate positioning block 310 and meshing with the worm wheel 211, and a positioning column 330 extending upward from the osteotomy plate positioning block 310, the worm wheel 320 is configured to drive the indicating disk 250 to rotate relative to the pointer 240; and a probe 400 disposed on the positioning column 330, which is configured to be movable relative to the positioning column 330 in a direction perpendicular to the extending direction of the positioning column 330.

[0036] When using the femoral condyle AP measuring device according to the present invention, an operator (e.g., a surgeon) can drive the worm wheel 320 of the transmission 300 and the osteotomy plate positioning block 310 to rotate relative to the driving measuring device 200 by rotating the worm 211 in the driving side frame 210 of the driving measuring device 200, and then the worm wheel 320 drives the indicator disk 250 to rotate relative to the driving measuring device 200 and thus relative to its pointer 240. Therefore, the operator can rotate the osteotomy plate positioning block 310 through the worm wheel 211 according to the rotation angle of the femoral posterior condyle of the patient obtained in the CT operation, and read the rotation angle of the osteotomy plate positioning block 310 through the angle scales on the pointer 240 and the indicator disk 250. When the osteotomy plate positioning block 310 is rotated to a desired angle (particularly, the rotation angle of the femoral posterior condyle), the angular position of the osteotomy plate positioning block 310 is automatically mechanically fixed due to the self-locking effect of the worm wheel, and thus the angular position of the osteotomy plate to be installed is fixed. Then, when the base 110 has been against the posterior femoral condyle, the drive measuring device 200 and the transmission device 300 are slid along the measuring column 120 until one end of the probe 400 is against the anterior femoral condyle. At this time, the anterior and posterior femoral condyle size (i.e., femoral condyle AP) can be read by the height scale on the ruler 230, and the vertical and horizontal positions of the osteotomy plate can be further determined by the osteotomy plate positioning block 310. Therefore, by using the femoral condyle AP measuring device according to the present invention, the angular position of the osteotomy plate positioning block 310 can be adjusted smoothly, continuously, and steplessly due to the use of a worm gear transmission, and the osteotomy plate positioning block 310 can be automatically and mechanically locked at any angular position. It is worth mentioning that, due to individual differences, different patients have different femoral condyle rotation angles, but the angle orientation of the osteotomy plate positioning block 310 of the femoral condyle AP measuring device of the present invention can be adjusted and automatically mechanically locked according to the femoral condyle rotation angle of any patient, so as to cut out the osteotomy surface that best suits the patient in the subsequent osteotomy operation. Therefore, the femoral condyle AP measuring device according to the present invention has a high degree of reliability and can fully cope with the individual differences of patients. Further, since the distance between the probe 400 and the osteotomy plate positioning block 310 is limited by the positioning column 330 and does not change with the rotation of the osteotomy plate positioning block 310, the subsequent osteotomy size is fixed and does not change due to the change of the patient's femoral condyle rotation angle, which is very advantageous when using the femoral condyle AP measuring device of the present invention to perform anterior reference osteotomy.

[0037] refer to Figure 2According to a feasible embodiment of the present invention, the transmission 300 includes a driving gear 340 (preferably a bevel gear) which is coaxial with the worm gear 320 and can rotate synchronously with the worm gear 320, and a driven gear 251 (preferably a bevel gear) which is fixedly connected to the indicating disc 250 and coaxial therewith is provided at the rear of the indicating disc 250, wherein the driving gear 340 is meshed with the driven gear 251 and is configured to drive the driven gear 251 to rotate, and a transmission ratio between the two is less than 1, preferably less than 0.1, and more preferably between 0.02 and 0.08.

[0038] According to the above technical solution, since the transmission ratio between the driving gear 340 of the transmission device 300 and the driven gear 251 of the indicator disk 250 driven by the driving gear 340 is less than 1, the ratio of the rotation angle of the driven gear 251 to the rotation angle of the driving gear 340 (the inverse of the above transmission ratio) will be greater than 1. Therefore, when the worm gear 320 and the osteotomy plate positioning block 310 and the driving gear 340 that rotate synchronously therewith rotate by a small angle, the driven gear 251 and the indicator disk 250 that is fixedly connected thereto will rotate by a large angle in proportion. Further, by setting a suitable angle scale on the indicator disk 250, the rotation angle of the worm gear 320 and the osteotomy plate positioning block 310 that rotates synchronously therewith can be displayed on the indicator disk 250 in an enlarged manner. For example, when the transmission ratio is 0.05, when the osteotomy plate positioning block 310 rotates 10°, the indicator disk 250 will rotate approximately 180°, so the angle scale of 0-10° can be evenly set in the angle range of 0-180° on the indicator disk 250. This will help the operator to control the rotation angle of the osteotomy plate positioning block 310 more accurately and intuitively, so that the rotation angle of the osteotomy plate positioning block 310 fully complies with the patient's femoral condyle rotation angle, and an osteotomy surface that fully suits the patient can be cut in the subsequent osteotomy surgery.

[0039] refer to Figure 1 and Figure 2 According to a possible embodiment of the present invention, the driving gear 340 is connected to the osteotomy plate positioning block 310 through a pair of cantilevers 350, wherein the pair of cantilevers 350 are separated from each other in the lateral direction so that the measuring side frame 220 is received therebetween.

[0040] According to the above technical solution, since the measuring side frame 220 is received between a pair of cantilevers 350, when the osteotomy plate positioning block 310 rotates too much, the cantilever 350 will be blocked by the measuring side frame 220, thereby preventing the osteotomy plate positioning block 310 from further rotating. In other words, the cooperation between the cantilever 350 and the measuring side frame 220 can play a role of mechanical limiting, thereby preventing the osteotomy plate positioning block 310 and the probe 400 connected thereto from rotating too much and thus causing unnecessary damage to the patient.

[0041] refer to Figure 1 According to a feasible embodiment of the present invention, a mark indicating the rotation direction of the osteotomy plate positioning block 310 is provided on the indicator disk 250, that is, a mark L indicating the rotation direction to the left and a mark R indicating the rotation direction to the right. In particular, the angle scale indicating the rotation angle of the osteotomy plate positioning block 310 is evenly distributed in the angle range of 0-360° on the indicator disk 250. For example, the angle scale indicating the rotation angle of the osteotomy plate positioning block 310 rotating from the initial position to the left is evenly distributed in the angle range of 0-180° in the left half of the indicator disk 250; and the angle scale indicating the rotation angle of the osteotomy plate positioning block 310 rotating from the initial position to the right is evenly distributed in the angle range of 0-180° in the right half of the indicator disk 250.

[0042] According to the above technical solution, the operator can more intuitively adjust the rotation direction and rotation angle of the osteotomy plate positioning block 310 through the rotation direction mark and angle scale on the indicator plate 250. Further, since the angle scales indicating the rotation angle of the osteotomy plate positioning block 310 in a smaller range (e.g., -10° to +10°) are evenly distributed in a larger angle range (e.g., 0 to 360° or -180° to +180°) on the indicator plate 250, the operator can more accurately adjust the rotation angle of the osteotomy plate positioning block 310.

[0043] refer to Figure 3 According to a feasible embodiment of the present invention, the probe 400 includes: a horizontal portion 410, which is slidably assembled on the positioning column 330 (for example, by being snapped into the groove 331 at the upper end of the positioning column 330); an inclined portion 420 inclined downward from the horizontal portion 410; and a tip 430 arranged at the lower end of the inclined portion 420, which is configured to abut against the anterior condyle of the femoral condyle.

[0044] During use of the femoral condyle AP measurer according to the above technical solution, only the tip 430 with a smaller size abuts against the anterior condyle of the femoral condyle, so the size of the femoral condyle can be measured more easily and accurately.

[0045] Continue to refer Figure 3According to a feasible embodiment of the present invention, the horizontal portion 410 includes a first guide rail 411, a second guide rail 412 spaced apart from the first guide rail 411, and a mounting opening 413 provided at the end of the first guide rail 411, wherein the first guide rail 411 and the second guide rail 412 are located on both sides of the groove 331 at the upper end of the positioning column 330 and can be slidably inserted into the groove 331, and the mounting opening 413 is configured to install the probe 400 to the positioning column 330 or remove the probe 400 from the positioning column 330. In particular, the first guide rail 411 and the second guide rail 412 have an L-shaped cross section, and the groove 331 has an L-shaped cross section matching therewith. In particular, the groove 331 is an annular groove, so that the probe 400 can both slide and rotate relative to the positioning column 330.

[0046] According to the above technical solution, the operator can more flexibly and freely choose where to measure the size of the femoral condyle, thereby measuring a more accurate femoral condyle size and improving the success rate of subsequent osteotomy procedures.

[0047] refer to Figure 2 According to a feasible embodiment of the present invention, the driving side frame 210 includes a knob 212 disposed on the outside thereof, and the knob 212 is configured to rotate the worm 211. In particular, a knurl is disposed on the outer circumferential surface of the knob 212.

[0048] refer to Figure 2 According to a feasible implementation of the present invention, a pair of osteotomy plate positioning holes 311 are provided on the osteotomy plate positioning block 310. In particular, the line between the centers of the pair of osteotomy plate positioning holes 311 is perpendicular to the extension direction of the positioning column 330.

[0049] When using the femoral condyle AP measuring device according to the above technical solution, after the probe 400 abuts against the anterior femoral condyle as described above, the operator can screw a pair of bone screws (especially, headless skull screws) through a pair of osteotomy plate positioning holes 311 into the femoral condyle, respectively, so as to determine the position of the osteotomy plate to be installed. Further, since the distance between the pair of osteotomy plate positioning holes 311 and the probe 400 is defined by the positioning column 330 and does not change with the rotation of the osteotomy plate positioning block 310, as described above, the subsequent osteotomy size is fixed and will not change due to the change of the patient's femoral condyle rotation angle, which is very advantageous when using the femoral condyle AP measuring device of the present invention to perform anterior reference osteotomy.

[0050] refer to Figure 3According to a feasible embodiment of the present invention, the measuring column 120 includes a protrusion 121 (particularly detachably) disposed on its side wall and located above the measuring side frame 220, and the protrusion 121 is configured to prevent the measuring column 120 from being separated from the measuring side frame 220. Particularly, a recess 221 is disposed on the measuring side frame 220, and the recess 221 is configured to receive the protrusion 121.

[0051] According to the above technical solution, the measurement column 120 can be effectively prevented from being separated from the measurement side frame 220 during the use of the femoral condyle AP measuring instrument, thereby affecting the progress of the measurement. Therefore, the reliability of the femoral condyle AP measuring instrument can be improved.

[0052] refer to Figure 3 According to a possible embodiment of the present invention, the base 110 includes a pair of claws 111 in the form of thin plates extending backward therefrom, and the pair of claws 111 are configured to abut against the posterior condyle of the femoral condyle.

[0053] According to the above technical solution, since the claw 111 for abutting the posterior femoral condyle is in the form of a thin sheet, the operator can more easily insert the claw 111 into the patient's tissue to abut the posterior femoral condyle, thereby reducing the difficulty of measuring the femoral condyle size and improving the success rate of measurement.

[0054] refer to Figure 4 According to a feasible embodiment of the present invention, the osteotomy plate positioning block 310 is pivotally connected to the measuring side frame 220 via a positioning block pivot 222 disposed at the rear of the measuring side frame 220 and extending in the front-to-back direction. In addition, the indicator plate 250 is pivotally connected to the pointer 240 via an indicator plate pivot 241 disposed at the rear of the pointer 240 and extending in the front-to-back direction.

[0055] The above describes in detail a preferred but non-limiting embodiment of the femoral condyle AP measuring device according to the present invention with the aid of the accompanying drawings. For those of ordinary skill in the art, modifications and additions to the technology and structure should obviously be considered to be included in the scope of the present invention without departing from the scope and essence of the present disclosure as set forth in the following claims. Therefore, these modifications and additions that can be conceived under the teachings of the present invention should be considered as part of the present disclosure. The scope of the present disclosure is defined by the claims attached below, and includes equivalent technologies known at the filing date of the present disclosure and equivalent technologies that have not yet been foreseen.

Claims

1. A femoral condyle AP measuring device, characterized in that: It includes: A base frame (100) comprising a base (110) configured to abut against a posterior condyle of a femoral condyle to be measured and a measurement column (120) extending upward from the base (110); A driving measuring device (200) comprising a driving side frame (210), a measuring side frame (220) fixedly connected to the driving side frame (210), a scale (230) having a height scale fixedly connected to the measuring side frame (220) and extending upward therefrom, a pointer (240) fixedly connected to the measuring side frame (220) and extending downward therefrom, and an indicating plate (250) having an angle scale pivotally connected to the pointer (240) at the rear of the pointer (240), wherein the driving side frame (210) comprises a worm (211) disposed transversely therein and rotatable relative thereto, and the measuring side frame (220) is configured to receive a measuring column (120) and allow the measuring column (120) to slide relative thereto in a vertical direction; a transmission device (300) pivotally connected to the driving measuring device (200), comprising an osteotomy plate positioning block (310), a worm gear (320) extending downward from the osteotomy plate positioning block (310) and meshing with the worm (211), and a positioning column (330) extending upward from the osteotomy plate positioning block (310), wherein the worm gear (320) is configured to drive the indicator disk (250) to rotate relative to the pointer (240); and The probe (400) is disposed on the positioning post (330) and is configured to be movable relative to the positioning post (330) in a direction perpendicular to the extension direction of the positioning post (330). The transmission device (300) further comprises a driving gear (340) which is coaxial with the worm gear (320) and can rotate synchronously with the worm gear (320); a driven gear (251) which is fixedly connected to the indicating disc (250) and coaxial with the indicating disc (250) is arranged at the rear of the indicating disc (250); the driving gear (340) is meshed with the driven gear (251) and is configured to drive the driven gear (251) to rotate; the transmission ratio between the two is less than 1, so that the rotation angle of the worm gear (320) and the osteotomy plate positioning block (310) is displayed on the indicating disc (250) in an enlarged manner; and In which, the indicator disk (250) is provided with an identification indicating the rotation direction of the osteotomy plate positioning block (310), namely, an identification L indicating the rotation direction to the left and an identification R indicating the rotation direction to the right, and the angle scale indicating the rotation angle of the osteotomy plate positioning block (310) is evenly distributed in the angle range of 0-360° on the indicator disk (250), and the osteotomy plate positioning block (310) is provided with a pair of osteotomy plate positioning holes (311).

2. The femoral condyle AP measuring device according to claim 1, characterized in that: The driving gear (340) is connected to the osteotomy plate positioning block (310) through a pair of cantilever arms (350), wherein the pair of cantilever arms (350) are separated from each other in a lateral direction so that the measuring side frame (220) is received therebetween.

3. The femoral condyle AP measuring device according to claim 1 or 2, characterized in that: The probe (400) comprises: A horizontal portion (410) slidably mounted on the positioning column (330); an inclined portion (420) inclined downward from the horizontal portion (410); and A tip (430) is provided at a lower end of the inclined portion (420) and is configured to abut against the anterior condyle of the femoral condyle.

4. The femoral condyle AP measuring device according to claim 3, characterized in that: The horizontal portion (410) includes a first guide rail (411), a second guide rail (412) spaced apart from the first guide rail (411), and an installation opening (413) arranged at the end of the first guide rail (411), wherein the first guide rail (411) and the second guide rail (412) are located on both sides of a groove (331) at the upper end of the positioning column (330) and can be slidably inserted into the groove (331), and the installation opening (413) is configured to install the probe (400) to the positioning column (330) or remove the probe (400) from the positioning column (330).

5. The femoral condyle AP measuring device according to claim 1 or 2, characterized in that: The driving side frame (210) includes a knob (212) disposed on an exterior thereof, and the knob (212) is configured to rotate the worm (211).

6. The femoral condyle AP measuring device according to claim 1 or 2, characterized in that: The measuring column (120) comprises a protrusion (121) arranged on a side wall thereof and located above the measuring side frame (220), and the protrusion (121) is configured to prevent the measuring column (120) from being separated from the measuring side frame (220).

7. The femoral condyle AP measuring device according to claim 1 or 2, characterized in that: The base (110) includes a pair of claws (111) in the form of thin plates extending rearwardly therefrom, and the pair of claws (111) are configured to abut against the posterior condyle of the femoral condyle.

Images