CN114099094B

CN114099094B - Motion axis positioner for total knee replacement

Info

Publication number: CN114099094B
Application number: CN202110774412.0A
Authority: CN
Inventors: 王志坚
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-08-26
Filing date: 2021-07-08
Publication date: 2025-01-10
Anticipated expiration: 2041-07-08
Also published as: TWI730883B; TW202207881A; CN216060892U; CN114099094A

Abstract

The present invention provides a motion axis locator for artificial knee replacement, which includes two spoon arms and a connecting body. The two spoon arms can be placed between the proximal tibia and the distal femur, and the proximal tibia and the distal femur are restrained by ligaments, so that the medial condyle and the lateral condyle of the femur are respectively clamped against the two spoon arms on the tibial platform with corresponding curvatures. The connecting body naturally locates a reference axis according to the position of the two spoon arms when clamped. The reference axis is nearly parallel to the motion axis of the medial condyle and the lateral condyle relative to the tibial platform. The joint surface between the proximal tibia and the distal femur is trimmed according to the reference axis, thereby forming the present invention.

Description

Motion axis positioner for artificial knee joint replacement

Technical Field

The invention relates to an instrument for artificial knee joint replacement, in particular to a motion axis positioner for artificial knee joint replacement.

Background

The knee joints of the lower limbs are worn down due to heavy weight and frequent friction of many joints in the bones of the human body, so that the knee joints are worn down inevitably after the knee joints are worn down for years and months, pain is caused at the moment, and when the pain is serious, the knee joints are inconvenient to move and have life trouble, and the knee joints are improved by replacing the artificial joints through operation.

At present, a total knee replacement operation (TotalKneeArthroplasty, TKA) is performed by firstly trimming the proximal tibia (ProximalTibial) and the distal femur (DistalFemur) and then implanting the artificial joint and the pad. The proximal tibia and the distal femur cannot be restored after being resected by surgical trimming, so that the artificial joint has good adaptability to the original bones of a patient after the surgery, and how to trim the proximal tibia and the distal femur in a correct manner is one of the important subjects of knee joint replacement surgery.

With respect to the revision of the proximal tibia and the distal femur, one prior art technique, so-called mechanical axis alignment (MECHANICALALIGNMENT, MA), is known as mechanical axis alignment, which uses the line from the center of rotation of the femoral head through the center of the proximal tibia to the midpoint of the medial and lateral malleoli as a reference axis, typically obtained via X-ray fluoroscopy, along which the proximal tibia and the distal femur, respectively, can be cut to form perpendicular articular surfaces, followed by implantation of the prosthetic joint and the pad to complete the prosthetic joint replacement. However, it is found clinically that, for example, the ratio of the population census is less than 2% of the lower limb according to the mechanical axis setting, many patients often have deformity phenomenon called "unequal knee varus" or "knee valgus", at which time the joint surfaces of the original proximal tibia and the remote femur of the patient are not perpendicular to the mechanical axis, if the mechanical axis is calibrated to obtain the joint surface perpendicular to the mechanical axis through operation for artificial joint replacement, although the joint surface after operation can be perpendicular to the mechanical axis, the collateral ligament on the narrow side before correction must be pulled apart during operation to correct the deformity phenomenon called "knee valgus" or "knee valgus", but the collateral ligament is loosened due to the pulling apart, so that the knee joint is unstable and the walking weakness and the sequelae of pain are generated.

Another prior art approach to tailor the proximal tibia to the distal femur is the so-called motion axis alignment (KINEMATICALIGNMENT, KA), which is the reference axis for the medial/lateral femoral condyle (Medial/Lateralcondylefemur) to flip relative to the tibial plateau (TibialPlateau) as the lower limb flexes. Unlike the mechanical axis-aligned knee replacement surgery described above, if the knee replacement surgery is performed according to the motion axis alignment, the articular surfaces of the proximal tibia and the distal femur after correction will almost overlap the articular surfaces before correction, i.e., the original angle between the tibia and the femur is maintained after the surgery, and the collateral ligaments on both sides of the knee joint do not need to be pulled apart during the surgery, so that the knee replacement surgery, compared to the mechanical axis-aligned knee replacement surgery, does not cause the collateral ligaments to relax, resulting in the loss of walking and pain sequelae of the knee joint.

The motion axis is a virtual imaginary axis and is not detectable by naked eyes, the prior art is a mode for searching the motion axis, the upper and lower positions of the femur and the tibia of a patient are measured through images, the modeling is carried out after calculation through the dynamic process of the swing of the lower limb, a personalized operation tool (PersonalSpecificInstrument, PSI) is built, and finally the personalized operation tool is used for knee joint replacement operation with the alignment of the motion axis. However, in order to obtain the personalized surgical tool for knee joint replacement surgery, at present, after image measurement and calculation modeling, related modeling data are sent to singapore for authentication, and after authentication, the model is opened and manufactured by a mold factory located in belgium, and the authentication and manufacturing process can be completed only by two weeks to one month, and the manufacturing cost is not very high, so that the knee joint replacement surgery using the movement axis alignment is time-consuming, labor-consuming and high in cost.

As another example, U.S. patent publication No. 08900242B2, which is a stylus assembly (StylusAssembly), is designed primarily to use one end (17, 18) to provide a reference surface for positioning against an unworn posterior femoral condyle (56) and to perform resection of the proximal tibia in accordance with the reference surface, the stylus assembly of the present invention is still designed as a tool based on mechanical axis alignment. The scheme utilizes a plurality of needle pen assemblies, and the end parts of the needle pen assemblies have different thicknesses (such as 1-3 mm) so as to correspond to the fact that after different joint surfaces are worn, the medial collateral ligaments become loose, and the medial collateral ligaments are used for expanding the condyles of the knee joints to restore the normal tightness, and are not actually used for positioning a movement axis; in clinical practice, it has been found that resections of the proximal tibia with the reference surface providing a location against the side of the femoral condyle that is not worn tend to result in insufficient resections of the worn tibial condyle, whereas resections of the side of the femoral condyle that is worn tend to result in too much resections of the side of the unworn tibial condyle that is not worn, thus requiring repeated revision during resections to achieve balance, thus causing inconvenience and confusion in the revision of the knee joint surface.

Disclosure of Invention

In order to solve the above problems, the present invention provides a motion axis positioner for artificial knee joint arthroplasty, which assists an operator in positioning the motion axis before the articular surfaces of the proximal tibia and the distal femur are trimmed.

One embodiment of the invention provides a motion axis positioner for artificial knee joint replacement, which comprises two spoons and a connecting body, wherein the two spoons are symmetrically arranged on the same side of the connecting body, the two spoons of a guiding cutting part are respectively in an arc shape to correspond to the curvature of an inner condyle and an outer condyle of a human femur on a sagittal sphere, the two spoons can be placed between a proximal tibia and a remote femur along a sagittal axis, the proximal tibia and the remote femur are limited by ligaments, the inner condyle and the outer condyle are respectively clamped on a tibial platform with corresponding curvatures, a reference axis is naturally positioned by the connecting body according to the position of the two spoons when the two spoons are clamped, the motion axes of the inner condyle and the outer condyle which are pivoted relative to the tibial platform are approximately parallel, and the joint surface between the proximal tibia and the remote femur is trimmed according to the reference axis.

In another embodiment of the present invention, the connecting system is long and extends along a straight line, the two spoons comprise a fixed spoons and a movable spoons, the fixed spoons are integrally formed at one end of the connecting body, the movable spoons are arranged on the connecting body and can slide along the length direction of the connecting body, and the distance between the movable spoons and the fixed spoons is adjusted and then fixed on the connecting body.

In another embodiment of the present invention, the movable scoop arm has an end portion, the end portion has a chute, an inner contour of the chute corresponds to a cross-sectional contour of the connecting body, and the end portion is sleeved with the connecting body by the chute so as to be capable of sliding along the length direction.

In another embodiment of the present invention, the connecting body has a guiding groove on one side different from the two spoon arms, the guiding groove is opened along the length direction of the connecting body, the end part is provided with a convex part corresponding to the guiding groove in the sliding groove, the end part is provided with a tightening piece on one side different from the convex part, and when the end part is sleeved on the connecting body by the sliding groove and the convex part is positioned in the guiding groove, the tightening piece is actuated to clamp the connecting body with the convex part for positioning.

In another embodiment of the present invention, the tightening member is a bolt, and the end portion of the tightening member is provided with a screw hole corresponding to the tightening member, and the tightening member is screwed into the screw hole and can be screwed to abut against the connecting body to clamp the end portion of the protrusion with the connecting body.

In another embodiment of the present invention, the connecting body has a handle, the handle extends perpendicularly to the linear extending direction of the connecting body, the handle is opposite to the extending direction of the two spoons from the connecting body, the handle is located between the two spoons, and the radius of curvature of each of the two spoons in an arc shape is 17mm to 29mm.

In another embodiment of the present invention, the guide cutting member further comprises a guide cutting member having an upper opposing cuff and a lower opposing securing portion, and the guide cutting member has a long slit between the cuff and the securing portion, when the connecting body naturally locates the reference shaft as described above, the handle is sleeved on the sleeve opening with a corresponding thickness, and the fixing part is fixed on the proximal tibia at the position, the long slit is parallel to the reference shaft in the length direction, and the cutting tool extends into the long slit and trims the tibia plateau along the reference shaft.

In another embodiment of the present invention, the guiding cutting member has a mounting groove between the sleeve opening and the fixing portion, the mounting groove is open at one side of the guiding cutting member, the guiding cutting member has a block body with a long slit, and the block body is assembled in the mounting groove from the side of the mounting groove in the open shape and positioned.

In another embodiment of the present invention, the long slit is inclined from high to low on the side with two scoop arms opposite to the side with the handle of the connecting body in the width direction of the block.

In another embodiment of the present invention, the fixing portion has a plurality of through holes, and the surgical bone screw may be inserted through one of the through holes and lock the fixing portion in place on the proximal tibia.

Therefore, the motion axis positioner for artificial knee joint replacement is an operation auxiliary device with simple structure and simple operation, before the joint surfaces of the proximal tibia and the remote femur are trimmed, the reference axes of the motion axes can be positioned by the motion axis positioner, and then the joint surfaces of the proximal tibia and the remote femur can be trimmed.

Drawings

FIG. 1 is a perspective view of a kinematic axis positioner according to an embodiment of the present invention;

FIG. 2 is an exploded configuration view of a kinematic axis positioner according to an embodiment of the present invention;

FIG. 3 is a side cross-sectional view taken along line 3-3 of FIG. 1;

FIG. 4 is a side view of an embodiment of the present invention with two spoons positioned in the sagittal axis of the knee;

FIG. 5 is a schematic front view of an embodiment of the present invention with two spoons positioned in the sagittal axis into the knee joint;

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

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

fig. 8 is a schematic view of a proximal tibial resection of the tibial plateau, with the tibial plateau resected and parallel to the axis of motion.

Description of the reference numerals

100 Motion shaft positioner 10, scoop arm

11 Parts of side wall 20 parts of spoon arm

21 Side wall 22 end

221 Screw hole 23 slide groove

24, Convex part 25, tightening piece

30 Connecting body 31 guide channel

32 Handle 40 guide cutting member

41 Pocket 42 fixing part

421 Perforations 43 long slits

44 Mounting groove 45 block

50 Bone screw K motion axis

F, remote femur IC, medial condyle

Ligament OC, lateral condyle

P tibial plateau T proximal tibia

X reference axis Y sagittal axis

R is curvature radius t and thickness.

Detailed Description

For the convenience of explanation of the central idea of the present invention represented in the above summary, the present invention is expressed in specific embodiments. The various objects in the embodiments are drawn to scale, size, deformation or displacement as appropriate for the description, and not to scale for the actual components, as previously described.

Referring to fig. 1 to 8, the present invention provides a motion axis positioner 100 for artificial knee joint replacement, which is used for positioning a motion axis during artificial knee joint replacement, and the definition of the motion axis is described in the background art, and will not be repeated herein. The kinematic axis positioner 100 mainly comprises the spoon arms 10, 20 and a connecting body 30, and in a preferred embodiment also comprises a guide cutting member 40, wherein:

The shape of the spoon arms 10 and 20 is symmetrical and is in an arc shape similar to that of a spoon, and the arc shape of the spoon arms 10 and 20 corresponds to the curvature of the medial condyle and the lateral condyle of the femur of the human body on the sagittal sphere. In this embodiment, each of the spoon arms 10 and 20 is flat and smooth in surface, and each of the spoon arms 10 and 20 has side walls 11 and 21 at two sides of the middle portion, the side walls 11 at two sides of the spoon arm 10 are symmetrically arranged, the side walls 21 at two sides of the spoon arm 20 are symmetrically arranged, and top edges of each of the side walls 11 and 21 are flat. The connecting body 30 is provided with the spoon arms 10 and 20 at the same side, the connecting body 30 is long and extends along a straight line in the embodiment, and is a long rectangular block, and the two sides of the connecting body 30 in the width direction are respectively in a plane shape along the straight line extending direction.

The scoop arm 10 is a fixed scoop arm in the present embodiment, and the other scoop arm 20 is a movable scoop arm in the present embodiment, the scoop arm 10 is integrally formed at one end of the connecting body 30, the scoop arm 20 is disposed on the connecting body 30 and can slide along the length direction of the connecting body 30, and the scoop arm 20 can be fixed on the connecting body 30 after adjusting the distance between the scoop arm 20 and the scoop arm 10. Preferably, the scoop arm 20 has an end 22, the end 22 has a chute 23, the inner contour of the chute 23 corresponds to the cross-sectional contour of the connecting body 30, and the end 22 of the scoop arm 20 is sleeved with the connecting body 30 by the chute 23, so that the scoop arm 20 can slide along the length direction of the connecting body 30. The radius of curvature R of the curved portion of the scoop arm 20 is 17mm to 29mm, so as to adapt to the different curvatures of the medial condyle and the lateral condyle of the femur on the sagittal sphere, and naturally reflect the movement axes of the medial condyle and the lateral condyle of the femur when the knee joint performs the extension-flexion movement, while the radius of curvature R of the scoop arms 10 and 20 in the present embodiment is 25mm. In addition, the thickness t of the scoop arms 10, 20 of this embodiment is 1mm at the portion corresponding to the curvature of the medial condyle and the lateral condyle of the femur on the sagittal sphere.

On the other hand, the connecting body 30 of the present embodiment has a guiding groove 31 on the side different from the spoon arms 10 and 20, the guiding groove 31 is also opened along the length direction of the connecting body 30, that is, the guiding groove 31 penetrates through the two ends of the connecting body 30, the end 22 of the spoon arm 20 has a protrusion 24 in the chute 23, the protrusion 24 is provided corresponding to the guiding groove 31, the end 22 is provided with a tightening member 25 on the side different from the protrusion 24, and when the end 22 is sleeved on the connecting body 30 by the chute 23 and the protrusion 24 is located in the guiding groove 31, the operator can clamp the protrusion 24 in the guiding groove 31 between the tightening member 25 and the connecting body 30 by the action of the tightening member 25. The protrusion 24 is provided on the end 22 and cooperates with the guide groove 31 of the connecting body 30, which is only one embodiment of the present invention, and in various embodiments, the protrusion 24 may be provided on the connecting body 30, and the guide groove 31 may be provided on the end 22, or may serve as a restriction when the end 22 slides on the connecting body 30.

Preferably, the tightening member 25 is a bolt in the present embodiment, the end 22 is provided with a screw hole 221 corresponding to the tightening member 25, the tightening member 25 is screwed into the screw hole 221 and can be screwed against the connecting body 30, and when the tightening member 25 is screwed into the screw hole 221 to a certain depth, the tightening member 25 is connected with the protrusion 24 to clamp the end 22 on the connecting body 30, so as to fix the scoop arm 20 on the connecting body 30. In addition, the connecting body 30 of the present embodiment has a handle 32, the handle 32 extends perpendicularly to the linear extending direction of the connecting body 30 (i.e. the handle 32 and the connecting body 30 are connected in a T shape), and the handle 32 extends from the connecting body 30 opposite to the directions in which the spoon arms 10 and 20 extend from the connecting body 30, the handle 32 of the present embodiment extends from the side of the connecting body 30 with the guide groove 31, the handle 32 is located between the spoon arms 10 and 20, and the handle 32 can be held by an operator.

In practical operation, the motion axis positioner 100 of the above embodiment takes the left foot as an example, when a patient cuts the skin and flesh tissue at the knee joint, and the joint portions of the proximal tibia T and the distal femur F can be seen, the scoop 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), at this time, since the proximal tibia T and the distal femur F are held by the ligaments L (including the lateral collateral ligament and the cruciate ligament), the proximal tibia T and the distal femur F can maintain a pulling force in opposite directions, the scoop arms 10 and 20 can maintain contact between the tibia plateau P and the medial condyle IC and the lateral condyle OC of the femur, and the medial condyle IC and the lateral condyle OC can clamp the scoop arms 10 and 20 on the tibia plateau P with corresponding curvatures, respectively (as shown in fig. 5), and as the scoop arms 10 and 20 are parallel or have a height difference in the horizontal direction, the joint body 30 naturally positions a reference axis X according to the position where the scoop arms 10 and 20 are clamped, the reference axis X is naturally positioned, the reference axis X and the medial condyle and the lateral condyle OC is parallel to the tibia plateau relative to the proximal tibia plateau P and the proximal femur P (see fig. 8).

To perform artificial knee arthroplasty in conjunction with the motion axis positioner 100 of the above-described embodiment, the present invention further includes, in a preferred embodiment, a guide cutter 40 to assist in the revision of the tibial plateau P after the reference axis X is positioned by the coupling body 30. The guiding cutter 40 has a socket 41 and a fixing portion 42, the socket 41 is opposite to the guiding cutter 40, the fixing portion 42 is opposite to the guiding cutter 40, and the guiding cutter 40 has a long slit 43 between the socket 41 and the fixing portion 42.

Preferably, the guiding and cutting member 40 has a mounting groove 44 between the socket 41 and the fixing portion 42, the mounting groove 44 is open at one side of the guiding and cutting member 40, the guiding and cutting member 40 has a block 45 with a long slit 43, the block 45 is assembled in the mounting groove 44 from the open side of the mounting groove 44, and the block 45 is positioned in the mounting groove 44.

On the support, the fixing portion 42 has a plurality of through holes 421, and each through hole 421 is configured for the surgical bone screw 50 to pass through, so as to lock the fixing portion 42 in the proper position of the proximal tibia T. Moreover, the long slit 43 is formed on the block 45, and the side with the handle 32 of the connecting body 30 is inclined from high to low toward the side with the spoons 10 and 20 (as shown in fig. 3), and the block 45 can be separated from the guiding and cutting member 40 and assembled again, so that the long slit 43 of the block 45 can be designed with different inclinations, and the block 45 with the long slit 43 with different inclinations can be assembled on the guiding and cutting member 40 according to the actual situation, thereby facilitating the smooth performance of the artificial joint replacement.

Continuing with the practical operation of the aforementioned kinematic axis positioner 100, when the connecting body 30 has naturally positioned the reference axis X according to the position of the spoon arms 10 and 20 when being clamped, the shank 32 extends out corresponding to the position of the connecting body 30, at this time, the socket 41 of the guiding cutting member 40 is sleeved with the shank 32 with a corresponding thickness (as shown in fig. 6), the guiding cutting member 40 is positioned along the shank 32 towards the proximal tibia T, then the bone screw 50 is used to select a suitable through hole 421 to be threaded through and locked to the proximal tibia T (as shown in fig. 7), the fixing portion 42 of the guiding cutting member 40 can be fixed on the proximal tibia T at the position, the long slit 43 on the block 45 is parallel to the reference axis X in the length direction, the cutting tool (not shown in the figure) extends into the long slit 43, and the tibial plateau P is resected along the reference axis X, at this time, the articular surface between the proximal tibia T and the distal tibia F is finished, and after the proximal tibia T is resected by the revision resection plateau, a plane parallel to the motion axis K (i.e. the reference axis X) can be obtained.

From the above description, it is apparent that the motion axis positioner 100 for artificial knee joint replacement according to the present invention is constructed by using the scoop arms 10 and 20 and the connecting body 30, and is a simple operation aid, and before the joint surfaces of the proximal tibia and the distal femur are trimmed, the reference axis X of a reference motion axis can be positioned by the medial condyle IC and the lateral condyle OC respectively pressing against the scoop arms 10 and 20 on the tibial plateau P with corresponding curvatures, so that the joint surfaces of the proximal tibia T and the distal femur F can be trimmed continuously, and clinical experiments prove that the joint surfaces of the proximal tibia T and the distal femur F are trimmed as precisely as the joint surfaces of the proximal tibia and the distal femur using the personalized operation tool described in the prior art, and the problem that balance can be achieved only by repeatedly trimming the joint surfaces of the proximal tibia and the distal femur is avoided, even if not experienced, the surgeon can simply position the reference axis X of the reference axis of the reference motion axis can be positioned by the motion axis positioner 100 according to the present invention, thereby achieving the purposes of saving time and money consumed for operation model verification and mold opening.

The above examples are only for illustrating the present invention and are not intended to limit the scope of the present invention. All modifications and variations which do not depart from the spirit of the invention are intended to be within the scope of the invention.

Claims

1. A motion axis positioner for artificial knee replacement, characterized in that it comprises two spoon arms and a connecting body, wherein the two spoon arms are arranged on the same side of the connecting body, and the two spoon arms are symmetrical in shape and are respectively curved to correspond to the curvature of the medial condyle and lateral condyle of the human femur on the sagittal spherical surface, 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 restrained by ligaments, the medial condyle and the lateral condyle are respectively clamped against the two spoon arms on the tibial platform with corresponding curvatures, and the connecting body is automatically adjusted according to the positions of the two spoon arms when being clamped. Then a reference axis is positioned, the reference axis is parallel to the movement axis of the relative pivoting of the medial condyle and the lateral condyle on the tibial platform, and the articular surface between the proximal tibia and the distal femur is trimmed according to the reference axis; wherein 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 movable spoon arm is arranged on the connecting body and can slide along the length direction of the connecting body, and the movable spoon arm is fixed to the connecting body after adjusting the distance between the movable spoon arm and the fixed spoon arm; the connecting body has a handle;

The motion axis locator also includes a guide cutting piece, which has a relatively upper sleeve and a relatively lower fixing portion, and the guide cutting piece has a long slit between the sleeve and the fixing portion. When the connecting body locates the reference axis, the handle is sleeved on the sleeve with a corresponding thickness and is fixed to the proximal tibia at the location by the fixing portion. The long slit is parallel to the reference axis in the length direction, and the cutting tool extends into the long slit and trims the tibial plateau along the reference axis.

2. The motion axis locator for artificial knee replacement as described in claim 1 is characterized in that the movable spoon arm has an end portion, the end portion has a slide groove, the inner contour of the slide groove corresponds to the cross-sectional contour of the connecting body, and the end portion is sleeved on the connecting body by the slide groove and can slide along the length direction.

3. The motion axis positioner for artificial knee replacement as described in claim 2 is characterized in that the connecting body has a guide groove on a side different from the two spoon arms, and the guide groove is opened along the length direction of the connecting body. The end has a convex portion in the slide groove corresponding to the guide groove, and the end is also provided with a clamping piece on a side different from the convex portion. When the end is mounted on the connecting body by the slide groove and the convex portion is in the guide groove, the clamping piece is actuated to clamp the connecting body with the convex portion to position it.

4. The motion axis locator for artificial knee replacement as described in claim 3 is characterized in that the tightening piece is a bolt, and a screw hole is provided at the end corresponding to the tightening piece, and the tightening piece is screwed into the screw hole and can be screwed to abut against the connecting body and clamp the end on the connecting body with the protrusion.

5. The motion axis locator for artificial knee replacement as described in claim 2 is characterized in that the handle is extended perpendicularly to the straight extension direction of the connecting body, and the handle is opposite to the direction in which the two spoon arms extend from the connecting body, and the handle is arranged between the two spoon arms; the curvature radius of each of the spoon arms is 17mm to 29mm.

6. The motion axis locator for artificial knee replacement as described in claim 1 is characterized in that the guide cutting piece has a mounting groove between the sleeve and the fixing portion, the mounting groove is open on one side of the guide cutting piece, the guide cutting piece has a block with the long slit, and the block is assembled in the mounting groove from the open side of the mounting groove and positioned.

7. The motion axis locator for artificial knee replacement as described in claim 6 is characterized in that the long slit is inclined from high to low in the width direction of the block, relative to the side of the connecting body with the handle toward the side with the two spoon arms.

8. The motion axis positioner for artificial knee replacement as claimed in claim 1, characterized in that the fixing portion has a plurality of through holes for passing bone screws used in surgery.