WO2022040952A1

WO2022040952A1 - Motion axis positioner for artificial knee replacement

Info

Publication number: WO2022040952A1
Application number: PCT/CN2020/111205
Authority: WO
Inventors: 王志坚
Original assignee: 王志坚
Priority date: 2020-08-26
Filing date: 2020-08-26
Publication date: 2022-03-03

Abstract

A motion axis positioner (10) for an artificial knee replacement, comprising two spoon arms (10, 20) and a connecting body (30); the two spoon arms (10, 20) can be placed between the proximal tibia (T) and the distal femur (F); in addition, the proximal tibia (T) and the distal femur (F) are restrained by a ligament (L), so that the inner condyle (IC) and the outer condyle (OC) of the femur clamp against the two spoon arms (10, 20) on the tibial plateau (P) at corresponding curvatures; the connecting body (30) naturally positions a reference axis (X) according to the positions of the two spoon arms (10, 20) when clamped, the reference axis (X) is approximately parallel to a motion axis (K) about which the inner condyle (IC) and the outer condyle (OC) pivot relative to one another on the tibial plateau (P), and articular surface trimming is carried out between the proximal tibia (T) and the distal femur (F) according to the reference axis (X).

Description

Motion axis locator for artificial knee arthroplasty

technical field

The present invention relates to an apparatus for artificial knee joint replacement, in particular to a motion axis locator for artificial knee joint replacement.

Background technique

There are many joints in the human skeleton, and the knee joint in the lower limb bears heavy weight and frequent friction, so the knee joint will inevitably cause wear and tear after years of use, and pain will follow at this time, and when the wear and tear is serious, it will be It leads to inconvenience of movement and has troubles in life. At this time, it must be improved by surgical replacement of artificial joints.

A current total knee arthroplasty (Total Knee Arthroplasty, TKA), the surgical procedure is to firstly replace the proximal tibia (Proximal Tibial) and the distal femur (Distal Femur) for trimming, followed by re-implantation of the artificial joint and cushion. Among them, the proximal tibia and distal femur cannot be recovered after surgical trimming and resection. The artificial joint cannot cooperate with the patient's native skeleton after surgery and has good adaptability. Therefore, how to correct the proximal tibia and distal femur in a correct way? The repair of the femur is one of the important topics in knee replacement surgery.

technical problem

Regarding the trimming of the proximal tibia and the distal femur, an existing method is the so-called Mechanical Alignment (MA). The line is used as a reference axis, which can generally be obtained through X-ray fluoroscopy. The proximal tibia and distal femur can be cut through the mechanical axis to cut out the vertical joint surface, and then implant the artificial joint and the pad to complete the artificial joint replacement. . However, it is clinically found that, compared with the proportion of the census, less than 2% of the lower limbs conform to the mechanical axis setting. Many patients often have the so-called "knee varus" or "knee valgus" deformity of different degrees. At this time The articular surfaces of the patient's original proximal tibia and distal femur are no longer perpendicular to the mechanical axis. The articular surfaces that are perpendicular to the mechanical axis are obtained surgically through the aforementioned mechanical axis calibration for artificial joint replacement. Although the articular surfaces can be restored after surgery It is perpendicular to the mechanical axis, but the collateral ligament on the narrow side before correction must be pulled apart during the operation so that the so-called "knee varus" or "knee valgus" deformity can be corrected. It causes relaxation, which leads to the instability of the knee joint and the sequelae of walking weakness and pain.

Another existing way of trimming the proximal tibia and the distal femur is the so-called Kinematic Alignment (KA). condyle femur) is the reference axis that rolls relative to the Tibial Plateau as the lower extremity flexes. The difference from the aforementioned mechanical axis-aligned knee replacement surgery is that if the knee replacement surgery is performed according to the motion axis alignment, the articular surfaces of the proximal tibia and distal femur after correction will almost overlap with the articular surfaces before the correction, that is, The original angle of the tibia and femur is still maintained after the operation, and the collateral ligaments on both sides of the knee do not need to be pulled apart during the operation. Therefore, compared with the knee replacement surgery with mechanical axis alignment, the collateral ligaments will not be loosened. Sequelae of knee joint weakness and pain.

The "movement axis" is a virtual imaginary axis rather than measurable with the naked eye. One of the existing ways to find the motion axis is to measure the upper and lower positions of the patient's femur and tibia through images, and to use the dynamic motion of the lower limb to swing. The process is calculated and modeled, and a humanized surgical tool (Personal Specific Instrument, PSI), and finally apply this personalized surgical tool for knee replacement surgery with motion axis alignment. However, in order to obtain the personalized surgical tool for knee replacement surgery, the current practice is to perform image measurement and computational modeling, and then send the modeling-related data to Singapore for certification. It is produced by a mold factory in Belgium. This certification and production process takes two weeks to a month to complete, and the production cost is expensive, resulting in a time-consuming, labor-intensive and costly knee replacement surgery using motion axis alignment. high.

Another example is the US Bulletin No. US08900242B2 Invention Patent, which proposes a stylus pen assembly (Stylus Assembly), mainly using one end against the unworn posterior condyle of the femur to provide a reference surface for positioning, and then resection of the proximal tibia is performed according to the reference surface. The needle and pen assembly of the invention patent is still aligned with the mechanical axis Designed for principled tools. In this case, multiple needle-pen assemblies are used, and the ends of the needle-pen assemblies are designed with different thicknesses (such as 1-3mm), so that the medial collateral ligament becomes loose after different articular surfaces are worn and used to stretch the knee joint. It is not used to locate the motion axis in practice, and it is found in clinical operations that, as the aforementioned end abuts on the lateral femoral condyle on the unworn side, and through its Provide a reference surface for positioning for proximal tibia resection, which may easily lead to insufficient resection of the worn tibial medial condyle; on the contrary, if the aforesaid end abuts against the worn side femoral medial condyle, it will easily lead to insufficient resection of the unworn tibial condyle. There are too many lateral condyle resections, so it is necessary to repeat the resection process to achieve a balance, which causes inconvenience and trouble in the repair of the knee joint surface.

technical solutions

In order to solve the above problem, the present invention provides a motion axis locator for artificial knee joint replacement, which can assist the surgeon in positioning the motion axis before the articular surfaces of the proximal tibia and the distal femur are trimmed.

An embodiment of the present invention provides a motion axis locator for artificial knee joint replacement, which includes two spoon arms and a connecting body. The two spoon arms of the guiding cutting member are symmetrically arranged on the connecting body of the guiding cutting member On the same side, and the two spoon arms of the guiding cutting member are arc-shaped respectively to correspond to the curvature of the medial and lateral femoral condyles of the human body on the sagittal plane, the two spoon arms of the guiding cutting member can be placed along the sagittal axis into the proximal tibia and the proximal tibia. Between the distal femurs, and the proximal tibia and distal femur are restrained by ligaments, the medial and lateral condyles are respectively clamped against the two spoon arms of the guiding cutting member on the tibial plateau with corresponding curvatures, and the guiding and cutting members are connected The body naturally locates a reference axis according to the position where the two spoon arms of the guiding cutting member are clamped, and the reference axis of the guiding cutting member is parallel to the movement axis of the relative pivoting of the medial condyle and the lateral condyle on the tibial platform, The articular surface between the proximal tibia and the distal femur is trimmed according to the reference axis of the guide cutter.

Preferably, the connecting body is elongated and extends along a straight line, the two spoon arms include a fixed spoon arm and a movable spoon arm, the fixed spoon arm is integrally formed at one end of the connecting body; The connecting body slides in the longitudinal direction, and is fixed to the connecting body after adjusting the distance between the movable arm and the fixed arm.

Preferably, the movable spoon arm has one end, and the end has a chute, the inner contour of the chute corresponds to the cross-sectional contour of the connecting body, and the end is slidable along the length direction by the connecting body being sleeved on the chute.

Preferably, the connecting body has a guide groove on the side away from the two spoon arms, the guide groove is opened along the length direction of the connecting body, and the end part has a convex part corresponding to the guide groove in the chute, and the end part is parallel to the guide groove. A pressing piece is arranged on the side away from the convex portion. When the end is sleeved on the connecting body through the chute and the convex portion is located in the guide groove, the pressing piece and the convex portion are clamped and positioned by locking the connecting body.

Preferably, the pressing member is a bolt, the end corresponding to the pressing member is provided with a screw hole, the pressing member is screwed in the screw hole, and can be screwed to abut against the connecting body and clamp the end portion of the convex portion in the connection. body.

Preferably, the connecting body has a handle portion, the handle portion is extended and the extension direction is perpendicular to the linear extending direction of the connecting body, and the handle portion is opposite to the direction in which the two spoon arms extend from the connecting body, and the handle portion is located at the two ends. Between the spoon arms; the curvature radius of each spoon body is 17mm to 29mm.

Preferably, it also includes a guide cutting member, the guide cutting member has a sleeve opening and a fixing portion, the sleeve opening is located above the fixing portion, and the guiding cutting member has a sleeve between the sleeve opening and the fixing portion. Long slit, when the connecting body is naturally positioned to the reference axis as described above, the handle is sleeved on the sleeve with a corresponding thickness, and is fixed to the proximal tibia at the location by the fixing part, and the length direction of the long slit is parallel to the reference axis , for the cutting tool to extend into the long slit and trim the tibial plateau along the reference axis.

Preferably, the guiding cutting member has an installation groove between the sleeve opening and the fixing portion, and the side edge of the installation groove close to the guiding cutting member is open, the guiding cutting member has a piece, and the block has a long slit. and the open side of the block body is assembled in the installation groove and positioned in the installation groove.

Preferably, the width direction of the long slit on the block is inclined from high to low from the side of the connecting body with the handle to the side of the two spoon arms.

Preferably, the fixing part has a plurality of perforations, and a bone screw for surgery can be pierced through one of the perforations, and the fixing part is locked at an appropriate position of the proximal tibia.

Thereby, the motion axis locator for artificial knee arthroplasty of the present invention is a simple-structured and easy-to-operate surgical aid. The reference axis is compared, and then the articular surface modification of the proximal tibia and the distal femur can be carried out, and it has been clinically proven to be as accurate as the articular surface modification of the proximal tibia and the distal femur using a personalized surgical tool, and the operation is easy. Simple and easy to implement, to achieve the effect of saving time and money for computational model verification and mold opening.

Description of drawings

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments;

1 is a three-dimensional combined view of a motion axis positioner according to an embodiment of the present invention;

2 is an exploded configuration diagram of a motion axis positioner according to an embodiment of the present invention;

Fig. 3 is the side sectional view of Fig. 1 as seen on the 3-3 section line;

4 is a schematic side view of the motion axis locator according to the embodiment of the present invention with two spoon arms inserted into the knee joint along the sagittal axis;

5 is a schematic front view of the motion axis locator according to the embodiment of the present invention, and two spoon arms are inserted into the knee joint along the sagittal axis;

FIG. 6 is a schematic front view of FIG. 5 after the guide cutting member is installed on the handle;

7 is a schematic view of the guide cutting member of FIG. 6 being fixed to the proximal tibia with bone screws;

Figure 8 is a schematic view of the proximal tibia corrected to remove the tibial plateau.

Description of reference numerals

100: Motion axis locator 10: Spoon arm

11: side wall 20: Spoon Arm

21: Side Wall 22: End

221: screw hole 23: Chute

24: convex part 25: Pressing parts

30:Connector 31: Guide ditch

32: Handle 40: Guide cutting pieces

41: mouthpiece 42: Fixed part

421: Piercing 43: Long slit

44: Installation slot 45: Block

50: Bone screw K: motion axis

F: Distal femur IC: medial condyle

L: ligament OC: Lateral Condyle

P: tibial plateau T: proximal tibia

X: reference axis Y: sagittal axis

R: radius of curvature t: thickness.

BEST MODE FOR CARRYING OUT THE INVENTION

In order to facilitate the description of the central idea of the present invention expressed in the column of the above-mentioned summary of the invention, it is now expressed with specific embodiments. The various objects in the embodiments are drawn in proportions, dimensions, deformations or displacements suitable for illustration, rather than to the scale of the actual elements.

Please refer to FIGS. 1 to 8 , the present invention provides a motion axis locator 100 for artificial knee joint replacement, which is used for positioning the motion axis during artificial knee replacement. The definition of the motion axis has been clearly described in the prior art , and will not be repeated here. The motion shaft positioner 100 mainly includes two spoon arms 10, 20 and a connecting body 30, and in a preferred embodiment, also includes a guiding cutting member 40, wherein:

The two spoon arms 10 and 20 are symmetrical in shape and are respectively curved and similar to the spoon shape. The curved shapes of the two spoon arms 10 and 20 correspond to the curvature of the human femoral medial and lateral condyles on the sagittal plane. In this embodiment, each of the spoon arms 10 and 20 is flat and has a smooth surface, and each of the spoon arms 10 and 20 respectively has side walls 11 and 21 on both sides of the middle part, and the two side walls 11 of the spoon arm 10 are symmetrical. In addition, the side walls 21 of the spoon arm 20 are also symmetrically arranged, and the top edges of the side walls 11 and 21 are flat. The connecting body 30 is provided with two spoon arms 10 and 20 on the same side. In this embodiment, the connecting body 30 is elongated and extends along a straight line, and is a long rectangular block. The sides are respectively planar along the extending direction of the straight line.

The spoon arm 10 is a fixed spoon arm in this embodiment, and the other spoon arm 20 is a movable spoon arm in this embodiment. The spoon arm 10 is integrally formed at one end of the connecting body 30; The connecting body 30 can slide along the length direction of the connecting body 30 to adjust the distance between the spoon arm 20 and the spoon arm 10 , and then the spoon arm 20 can be fixed on the connecting body 30 . Preferably, the spoon arm 20 has one end 22 , and the end 22 has a chute 23 , the inner contour of the chute 23 corresponds to the cross-sectional profile of the connecting body 30 , and the end 22 of the spoon arm 20 is set through the chute 23 . The connecting body 30 is provided so that the spoon arm 20 can slide along the length direction of the connecting body 30 . The curved curvature radius R of the spoon arm 20 is 17mm to 29mm, so as to adapt to the different curvatures of the medial and lateral femoral condyles on the sagittal plane, and when the knee joint performs the straightening-bending movement, it naturally reflects the different curvatures. The motion axis when the medial and lateral femoral condyles rotate like a sphere, and the radius of curvature R of the two spoon arms 20 in this embodiment is both 25mm. In addition, the two spoon arms 20 of the present embodiment correspond to the positions of the curvature of the medial and lateral femoral condyles on the sagittal plane, and the thickness t thereof is both 1 mm.

On the other hand, the connecting body 30 of this embodiment has a guide groove 31 on the side away from the two spoon arms 10 and 20. The guide groove 31 is also opened along the length direction of the connecting body 30, that is, the guide groove 31 penetrates the connecting body At both ends of 30, the end 22 of the spoon arm 20 has a convex portion 24 in the chute 23, and the convex portion 24 is provided corresponding to the guide groove 31; When the end part 22 is sleeved on the connecting body 30 through the sliding groove 23 and the convex part 24 is located in the guide groove 31, the operator can lock the pressing part 25 to connect the pressing part 25 with the guide groove 31. The inner convex portion 24 is clamped and positioned by the connecting body 30 . The end portion 22 has a protruding portion 24 to fit with the guide groove 31 of the connecting body 30 , which is only an implementation state of the present invention. The guide grooves 31 can be arranged on the end portion 22 , and can also achieve a restricting effect when the end portion 22 slides on the connecting body 30 .

Preferably, the pressing member 25 is a bolt in this embodiment, the end 22 is provided with a screw hole 221 corresponding to the pressing member 25, and the pressing member 25 is screwed into the screw hole 221 and can be screwed to the connecting body 30. When the pressing member 25 is screwed to a certain depth in the screw hole 221 , the pressing member 25 is linked with the convex portion 24 to clamp the end portion 22 to the connecting body 30 , so that the fixed spoon arm 20 is fixed on the connecting body 30 . fixed on. In addition, in this embodiment, the connecting body 30 has a handle portion 32, and the extension direction of the handle portion 32 is perpendicular to the linear extending direction of the connecting body 30 (that is, the handle portion 32 and the connecting body 30 are connected in a T shape), and the handle portion 32 Contrary to the direction in which the two spoon arms 10 and 20 extend from the connecting body 30 , the handle 32 in this embodiment extends from the side of the connecting body 30 with the guide groove 31 , and the handle 32 is located on the two spoon arms 10 and 20 . In between, the handle 32 can be held by the operator.

In the actual operation of the motion axis locator 100 of the above-mentioned embodiment, taking the left foot as an example, when the patient cuts the skin and flesh tissue at the knee joint, and the joint parts of the proximal tibia T and the distal femur F are visible, the two are moved together. The spoon arms 10 and 20 are placed between the proximal tibia T and the distal femur F along the sagittal axis Y (as shown in FIG. 4 ). The collateral ligament and cruciate ligament) are restrained, the proximal tibia T and the distal femur F will maintain an opposite tensile force, and the two spoon arms 10, 20 can be maintained between the tibial plateau P and the medial condyle IC and lateral condyle OC of the femur contact, and make the medial condyle IC and lateral condyle OC clamp the two spoon arms 10, 20 against the tibial plateau P (as shown in FIG. 5) with corresponding curvatures, and as the two spoon arms 10, 20 are The horizontal direction is parallel or there is a difference in height. At this time, the connecting body 30 will naturally locate a reference axis X according to the position where the two spoon arms 10 and 20 are clamped. This reference axis X is related to the inner condyle IC and the outer condyle OC. The relative pivoting motion axis K (see FIG. 8 ) of the tibial plateau P is nearly parallel, and the articular surface between the proximal tibia T and the distal femur F can be trimmed according to the reference axis X at this time.

In order to cooperate with the motion axis locator 100 of the above embodiment to perform artificial knee joint replacement, after the above-mentioned connecting body 30 locates the reference axis X, in a preferred embodiment of the present invention, the present invention further includes a guiding cutting member 40 to assist the tibia Trim of Platform P. The guiding cutting member 40 has a sleeve opening 41 and a fixing portion 42 , the sleeve opening 41 is opposite to the position of the guiding cutting member 40 , and the fixing portion 42 is located at the position of the guiding cutting member 40 . Opposite to the bottom, the guiding cutting member 40 has a long slit 43 between the sleeve opening 41 and the fixing portion 42 .

Preferably, the guiding cutting member 40 has an installation groove 44 between the sleeve opening 41 and the fixing portion 42 , and one side of the installation groove 44 close to the guiding cutting member 40 is open. The block 45 is provided with a long slit 43 . The block 45 is assembled in the mounting groove 44 from the open side of the mounting groove 44 , so that the block 45 is positioned in the mounting groove 44 .

On top of that, the fixing portion 42 has a plurality of through holes 421 , and each through hole 421 can be passed through by the bone screw 50 for surgery, so as to lock the fixing portion 42 in the proper position of the proximal tibia T. In addition, the long slit 43 is provided on the block 45, which is inclined from high to low from the side with the handle 32 of the connecting body 30 to the side with the two spoon arms 10 and 20 (as shown in FIG. 3 ). And because the blocks 45 can be separated and reassembled on the guide cutting member 40, the long slits 43 of the blocks 45 can be designed with different inclinations, and the blocks with different inclinations of the long slits 43 can be selected according to the actual situation. 45 is assembled on the guiding cutting member 40, which is beneficial to the smooth progress of artificial joint replacement.

Continuing the actual operation of the aforementioned motion axis positioner 100 , when the connecting body 30 naturally locates the reference axis X according to the position where the two spoon arms 10 and 20 are clamped, the handle 32 corresponds to the position of the connecting body 30 . At this time, the handle 32 can be sleeved in the sleeve 41 of the guide cutting member 40 with a corresponding thickness (as shown in FIG. 6 ), and the guide cutting member 40 can be inserted along the handle 32 And approach the proximal tibia T, and then use the bone screw 50 to select a suitable through hole 421 to pass through and lock it on the proximal tibia T (as shown in FIG. 7 ), so that the fixed portion 42 of the guiding cutting member 40 can be positioned at the location. It is fixed on the proximal tibia T, and the long slit 43 on the block 45 is parallel to the reference axis X in the length direction, and the cutting tool (not shown in the figure) can extend into the long slit 43 and along the reference axis X The tibial plateau P is removed to complete the articular surface modification between the proximal tibia T and the distal femur F. At this time, after the proximal tibia T is corrected and the tibial plateau is removed, it can be obtained parallel to the motion axis K (ie the reference axis X). slice.

From the above description, it is not difficult to find that the present invention is characterized in that the motion axis locator 100 for artificial knee replacement of the present invention is only composed of two spoon arms 10, 20 and a connecting body 30, which is a simple and convenient structure. It is a simple and easy-to-operate surgical aid, and before the articular surface of the proximal tibia and the distal femur is trimmed, the two spoon arms 10 and 20 can be clamped against the tibial plateau P with the corresponding curvature through the medial condyle IC and the lateral condyle OC respectively. A reference axis X, which is compared with the motion axis, can be located, and the articular surface modification of the proximal tibia T and the distal femur F can be successively performed. The result is as accurate as the articular surface trimming of the distal femur, and there is no problem of having to repeat the correction during the resection process to achieve balance. Even if the surgeon is not an experienced surgeon, it can be easily positioned by the motion axis locator 100 of the present invention. The reference axis X of the motion axis is compared, thereby achieving the effect of saving time and money for computational model verification and mold opening.

The above-mentioned embodiments are only used to illustrate the present invention, but not to limit the scope of the present invention. All modifications or changes that do not violate the spirit of the present invention belong to the protection scope of the present invention.

Claims

A motion axis locator for artificial knee arthroplasty, characterized in that it comprises two spoon arms and a connecting body, the two spoon arms are arranged on the same side of the connecting body, and the two spoon arms are symmetrical in shape The two spoon arms are respectively curved to correspond to the curvature of the human femoral medial and lateral condyles on the sagittal plane. The two spoon arms are placed between the proximal tibia and the distal femur along the sagittal axis, and the proximal tibia and the distal femur are affected by The ligament is restrained, so that the medial condyle and the lateral condyle are respectively clamped against the two spoon arms on the tibial plateau with corresponding curvature, and the connecting body is positioned according to the position of the two spoon arms when they are clamped. A reference axis, the reference axis Parallel to the movement axis of the relative pivoting of the medial and lateral condyles on the tibial plateau, the articular surface between the proximal tibia and the distal femur is trimmed according to the reference axis.
The motion axis locator for artificial knee arthroplasty as claimed in claim 1, wherein the connecting body is elongated and extends along a straight line, the two spoon arms comprise a fixed spoon arm and a movable spoon arm, the The fixed scoop arm is integrally formed at one end of the connecting body; the movable scoop arm is arranged on the connecting body and slides along the length direction of the connecting body, and is fixed to the connecting body after adjusting the distance between the movable scoop arm and the fixed scoop arm .
The motion shaft positioner for artificial knee arthroplasty as claimed in claim 2, wherein the movable spoon arm has one end, the end has a chute, and the inner contour of the chute corresponds to the cross section of the connecting body The end portion slides along the length direction through the sliding groove sleeved on the connecting body.
3. The motion axis positioner for artificial knee arthroplasty as claimed in claim 3, wherein the connecting body has a guide groove on a side away from the two spoon arms, and the guide groove is opened along the length direction of the connecting body , the end part has a pair of convex parts in the chute, which are provided with the guide groove, the end part is provided with a pressing piece on the side away from the convex part, and the end part is sleeved on the chute through the chute. When the connecting body and the protruding portion are located in the guide groove, the pressing member and the protruding portion are locked to clamp the connecting body to be positioned.
The motion shaft positioner for artificial knee arthroplasty as claimed in claim 4, wherein the pressing member is a bolt, the end portion is provided with a screw hole corresponding to the pressing member, and the pressing member is screwed on the in the screw hole, and can be screwed to abut against the connecting body to clamp the end portion to the connecting body with the protruding part.
The motion axis positioner for artificial knee arthroplasty as claimed in claim 3, wherein the connecting body has a handle portion, the handle portion is extended and the extending direction is perpendicular to the linear extending direction of the connecting body, and the connecting body has a handle portion. The handle portion is opposite to the direction in which the two spoon arms extend from the connecting body, and the handle portion is located between the two spoon arms; the curvature radius of each spoon body is 17mm to 29mm.
The motion axis locator for artificial knee arthroplasty as claimed in claim 6, further comprising a guide cutting member, the guide cutting member has a socket and a fixing portion, the socket is located at the fixing portion The guide cutting element has a long slit between the sleeve opening and the fixing part, and when the connecting body locates the reference axis, the handle part is sleeved on the sleeve opening with a corresponding thickness, And the proximal tibia at the position is fixed by the fixing part, the length direction of the long slit is parallel to the reference axis, and the cutting tool extends into the long slit and trims the tibial plateau along the reference axis.
The motion shaft locator of claim 7, wherein the guide cutting member has an installation groove between the sleeve and the fixing portion, and the installation groove is close to the guide cutting One side of the piece is open, the guiding and cutting piece has a block, the block has the long slit, and the block is assembled and positioned in the mounting groove from the open side of the mounting groove.
The motion axis locator for artificial knee arthroplasty as claimed in claim 8, wherein the long slit is in the width direction of the block, from the side of the connecting body with the handle to the two One side of the spoon arm slopes from high to low.
The motion axis locator for artificial knee arthroplasty as claimed in claim 7, wherein the fixing part has a plurality of perforations, and one of the perforations is selected for the bone screw used for surgery to pass through, and the fixing part is inserted into the fixed part. The proximal tibia is locked in place.