CN213821413U

CN213821413U - Knee joint replacement surgery caliber

Info

Publication number: CN213821413U
Application number: CN202021628729.0U
Authority: CN
Inventors: 徐卫东
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-08-07
Filing date: 2020-08-07
Publication date: 2021-07-30
Anticipated expiration: 2030-08-07

Abstract

The utility model relates to a knee joint replacement surgery measurer, which comprises a connecting positioning shaft, a movable tibial platform supporting plate and a fixed femoral condyle supporting plate; ratchets are distributed on the surface of the connecting and positioning shaft along the axial direction, and a hole is formed in the top end of the connecting and positioning shaft; an opening is formed in the U-shaped bottom plate surface of the movable tibial platform supporting plate; a pawl is further arranged on the movable tibial plateau supporting plate; the U-shaped bottom of the fixed femoral condyle supporting plate is provided with a connecting shaft, and the connecting shaft is provided with an expansion block. The U-shaped bottom of the fixed femoral condyle supporting plate is connected with the connecting shaft through a hinge; the axis extension line of the hinge is collinear with the U-shaped central axis of the fixed femoral condyle supporting plate. A pointer extends out of the top of the connecting shaft; and a dial scale for marking the angle between the pointer and the fixed femoral condyle supporting plate is vertically arranged on the fixed femoral condyle supporting plate. The beneficial effects of the utility model are that can conveniently measure and balance the joint clearance, be convenient for going on of total knee replacement art.

Description

Knee joint replacement surgery caliber

Technical Field

The utility model relates to a joint surgery operation instrument specifically is a knee joint replacement flexion and extension clearance is measured and is adjusted balanced instrument.

Background

The balance of the extension and flexion gaps in the total knee replacement is the key of successful operation, most of the surgeons adopt a measuring osteotomy method to perform femoral posterior condylar osteotomy by utilizing a femoral anatomical marking line at present, the method cannot accurately reflect the extension and flexion gaps and the tension of soft tissues at the inner side and the outer side of the knee joint, the flexion gap is easily larger than the extension gap after the operation, the tension of the inner side and the outer side is unbalanced, and the postoperative joint instability is caused, so that the operation failure is caused. The gap balancer can avoid the above situation as much as possible.

The internal and external tension of the stretching and bending gap and the stretching and bending gap of a stable artificial knee joint should be balanced. Currently, the balance of the straightening gap is performed by a spacer combined force wire rod in the total knee joint replacement operation. This method can only ensure that the straightening gap is a rectangle of equal width and cannot measure and adjust the internal and external tensions of the straightening gap. When the measurement of the osteotomy method is performed, the posterior condylar osteotomy amount, namely the size of the flexion gap, needs to be determined by utilizing the three anatomical mark lines-whitetide's line, the condylar passing line and the posterior condylar connecting line of the distal femur. However, this method has too much uncertainty: firstly, the individual differences of the three anatomical landmark lines are great; secondly, the three anatomical landmark lines determined by each surgeon have subjective differences; thirdly, the size of the buckling gap cannot be determined when the osteotomy is performed according to the method, so that the buckling gap and the straightening gap after the osteotomy are the same, and the tension of the inner side and the outer side of the buckling gap cannot be ensured to be equal.

In summary, the conventional osteotomy method for the extension gap and flexion gap of the total knee joint cannot accurately obtain the equal flexion and extension gap, and cannot obtain the equal flexion and extension gap of the medial and lateral sides.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the not enough of prior art, solve the difficult, balanced inconvenient problem of knee joint clearance measurement.

In order to achieve the purpose of the utility model, the utility model provides a knee joint replacement surgery measurer, which comprises a connecting positioning shaft with scales in the axial direction, a U-shaped movable tibial plateau supporting plate and a U-shaped fixed femoral condyle supporting plate;

ratchets are distributed on the surface of the connecting and positioning shaft along the axial direction; the top end of the connecting positioning shaft is provided with a hole;

an opening for a connecting positioning shaft to penetrate is formed in the surface of the U-shaped bottom of the movable tibial platform supporting plate; the movable tibial plateau supporting plate is also provided with a windowing I which penetrates through the inner wall of the opening, and a pawl which is matched with the ratchet is hinged in the windowing I;

the U-shaped bottom of the fixed femoral condyle supporting plate faces one side and is provided with a connecting shaft used for being fixed to the hole, and an expansion block used for being tightly matched with the hole is arranged on the connecting shaft.

The movable tibial plateau supporting plate and the fixed femoral condyle supporting plate pointed by the position are both in U-shaped structures, wherein two branches at the same top of the U-shaped structures are positioned on the same plane and used for supporting the corresponding parts. The bearing surface of the movable tibial plateau supporting plate after connection and the bearing surface of the fixed femoral condyle supporting plate after connection are approximately vertical to the connection positioning shaft. The U-shaped bottom of the fixed femoral condyle supporting plate is connected with the connecting and positioning shaft through the matching of the connecting shaft and the hole. When the ratchet and the pawl are matched, the moving tibial plateau supporting plate can be blocked from moving towards the top end of the connecting and positioning shaft. The expansion block expands in the hole, so that the connecting shaft is relatively positioned on the connecting positioning shaft, and the connecting shaft can be generally in the form of an elastic metal ring hoop.

Preferably, the surface of the side wall of the connecting and positioning shaft is provided with teeth along the axial direction; the movable tibial plateau supporting plate is also provided with a window II which penetrates through the inner wall of the opening, a rotating shaft is arranged in the window II, and a gear which is meshed with the teeth is coaxially fixed on the rotating shaft; the rotating shaft penetrates out of the side face of the movable tibial platform supporting plate, and a clamping head used for applying rotating force to the rotating shaft is arranged at the penetrating end.

The gear referred to here drives the mobile tibial plateau pallet to move along the connecting and positioning shaft by meshing and moving on the teeth. The dop is supporting to be equipped with the spanner, generally adopts torque wrench, forms rotatoryly through operating the spanner drive pivot outside removing shin bone platform layer board, can save effort and drive the removal of gear on the tooth.

Preferably, a guide structure is further fixed on the inner wall of the opening; and the surface of the side wall of the connecting and positioning shaft is provided with a guide rail matched with the guide structure along the axial direction.

The guide structure that this department pointed can be forms such as lug, recess, and the cooperation of guide structure and guide rail makes when removing tibial plateau layer board and can follow the removal of connecting the location axle, avoids rotatory slippage.

Preferably, a guide block is vertically arranged on the other side of the fixed femoral condyle supporting plate, and a drill guide hole facing the installation part of the femoral condyle osteotomy plate is formed in the guide block.

The drill guide hole penetrates through the guide block, and when the balancer is arranged in place, a drill is inserted into the drill guide hole, so that the femoral condyle can be precisely drilled.

Preferably, the guide block further comprises an eccentric guide wheel, and the guide block comprises a guide plate fixed with the fixed femoral condyle supporting plate and an outer sleeve sleeved on the guide plate; a wheel body of the eccentric guide wheel penetrates through the side wall of the outer sleeve; a long round hole vertical to the connecting positioning shaft is formed in the guide plate, and a mandrel of the eccentric guide wheel penetrates through the long round hole; a locking mechanism is also arranged between the outer sleeve and the guide plate; the drill bit guiding hole is arranged on the outer sleeve.

The long round hole perpendicular to the connecting and positioning shaft means that the length direction of the long round hole is perpendicular to the axis of the connecting and positioning shaft. Generally, an eccentric guide wheel may be manufactured in one piece to ensure its integrity and strength, and the eccentric guide wheel referred to herein may generally be composed of a wheel body and a spindle, the spindle being parallel to the axis of the wheel body, the spindle rotating about the axis of the wheel body when the wheel body rotates. The locking mechanism can be in the forms of a bolt penetrating through the outer sleeve and abutting against the guide plate, magnetic attraction fixation and the like, and can conveniently lock, fix and unlock the outer sleeve and the guide plate.

Preferably, the surface of the guide plate is provided with a convex block, the convex block penetrates out of the side wall of the outer sleeve, and the surface of the convex block is drawn with a scale corresponding to the side wall of the outer sleeve.

The convex block can be visually observed outside the outer sleeve. When the position of the drill guide hole is finely adjusted, the scale on the lug moves relative to the side wall of the outer sleeve. The scale setting can be in a specific form that the convex block is provided with scales, the corresponding side wall of the outer sleeve is provided with a scale needle, or the convex block is provided with the scale needle, and the corresponding side wall of the outer sleeve is provided with scales.

Preferably, an intramedullary rod for penetrating into the femur is connected to the guide block.

Preferably, the guide block is provided with a guide groove parallel to the connecting positioning shaft; a cylindrical sliding block is fixed at one end of the intramedullary rod and is arranged in the guide groove in a sliding mode.

The guide groove is matched with the cylindrical sliding block, the section of the groove is in an arc shape adapting to the cylindrical wall surface, and the intramedullary rod extends out of the opening surface of the guide groove.

Preferably, the U-shaped bottom of the fixed femoral condyle supporting plate is connected with the connecting shaft through a hinge; the axis extension line of the hinge is collinear with the U-shaped central axis of the fixed femoral condyle supporting plate.

The two sides of the position of the articulated shaft at the U-shaped bottom of the fixed femoral condyle supporting plate pointed by the position can also be convexly provided with a stop block for stopping the fixed femoral condyle supporting plate from rotating excessively. The fixed femoral condyle supporting plates are symmetrical on two sides of the central axis.

Preferably, a pointer extends out of the top of the connecting shaft; and a dial scale for marking the angle between the pointer and the fixed femoral condyle supporting plate is vertically arranged on the fixed femoral condyle supporting plate.

The pointer referred to here can swing along the articulated shaft.

Preferably, a scale is erected on the fixed femoral condyle supporting plate, and a sliding ruler for clinging to the cortex of the femoral anterior condyle is arranged on the scale.

The sliding ruler slides along the scale, during measurement, the sliding ruler is abutted to the cortex of the femoral anterior condyle from far to near, and the observation scale can conveniently read the moving distance of the sliding ruler, so that the thickness of the anterior condyle of the femoral condyle is obtained.

The gap between the tibial platform and the femoral condyle can be adjusted during operation by adjusting the distance between the movable tibial platform supporting plate and the fixed femoral condyle supporting plate. When the balancer is installed in place during operation, the gap can be opened by sliding and moving the tibial platform supporting plate, and when the balancer needs to be recovered, the state of the pawl can be adjusted to naturally relax the balancer under the pressure of human soft tissues. The movable tibial plateau supporting plate moves upwards in a one-way mode through the connecting positioning shaft, the movable tibial plateau supporting plate stops moving after reaching a target state, and the scale displayed on the connecting positioning shaft is the size of the gap under the current tension. And the expansion block is matched with the hole, so that the fixed femoral condyle supporting plate can be replaced conveniently.

Through the cooperation of gear and tooth for the removal and the adjustment of removing tibial plateau layer board are more accurate. By rotating the chuck, the gear can be conveniently rotated; after the torque wrench is matched, the balancer can be ensured to provide specific tension force, and the human body is prevented from being damaged.

The femoral condyle is punched after penetrating the drill guide hole, so that the bone cutting plate can be accurately configured on the femoral condyle.

The mandrel of the eccentric guide wheel reciprocates in the long shaft of the long round hole to drive the outer sleeve to reciprocate parallel to the connecting and positioning shaft, so that the position of the drill guide hole can be finely adjusted conveniently.

Through the setting of scale, can demonstrate the moving direction and the distance of overcoat relative deflector directly perceivedly to be convenient for discern the range of fine setting.

The arrangement of the intramedullary rod increases the axial stability of the balancer, the balancer is difficult to shift when the gap is opened, and the deviation of osteotomy positioning is avoided.

The intramedullary rod can slide in the guide groove under the action of the cylindrical sliding block, so that the adaptability of the intramedullary rod to different femur sizes is improved. The guide groove has the restriction of bead mouth, also lets the intramedullary rod when can follow cylindrical slider circumference rotation, avoids the intramedullary rod to excessively rotate in the guide groove.

The hinge joint between the fixed femoral condyle supporting plate and the connecting shaft allows the fixed femoral condyle supporting plate to form certain swing relative to the connecting shaft.

The rotating amplitude and direction of the fixed femoral condyle supporting plate can be measured by contrasting the pointer and the dial and observing the swinging of the pointer, so that the inner and outer side balance conditions of the straightening gap can be visually observed.

Through the cooperation of scale and slide rule, according to the anterior condyle thickness of femoral condyle, can conveniently select the femoral prosthesis of suitable size.

The beneficial effects of the utility model are that can conveniently measure and balance the joint clearance, be convenient for going on of total knee replacement art.

Drawings

Fig. 1 is a schematic view of the knee replacement surgery measuring device of the present invention after the fixed femoral condyle supporting plate is detached;

FIG. 2 is a schematic view of the first embodiment of the knee joint replacement surgery measuring device of the present invention;

FIG. 3 is an exploded view of the second embodiment of the knee replacement surgery measurement device of the present invention; wherein:

1-connecting positioning shaft 11-scale 12-ratchet

13-hole 14-tooth 2-mobile tibial plateau supporting plate

21-windowing I22-pawl 23-windowing II

24-rotating shaft 25-gear 26-chuck

3-fixed femoral condyle supporting plate 31-connecting shaft 32-expansion block

33-drill guide hole 34-eccentric guide wheel 341-wheel body

342-mandrel 35-guide plate 351-oblong hole

352-lug 353-guide groove 36-outer sleeve

37-pointer 38-dial 4-intramedullary rod

41-slider 5-hinge 6-staff gauge

61-slide rule

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

The knee joint replacement surgery measurer shown in fig. 1 to 3 comprises a connecting positioning shaft 1 with scales 11 in the axial direction, a U-shaped movable tibial plateau supporting plate 2 and a U-shaped fixed femoral condyle supporting plate 3; the surface of the connecting and positioning shaft 1 is provided with ratchets 12 along the axial direction; the top end of the connecting and positioning shaft 1 is provided with a hole 13; an opening for a connecting positioning shaft 1 to penetrate is formed in the surface of the U-shaped bottom of the movable tibial platform supporting plate 2; the movable tibial plateau supporting plate 2 is also provided with a window I21 penetrating to the inner wall of the opening, and the window I21 is hinged with a pawl 22 matched with the ratchet 12; the U-shaped bottom of the fixed femoral condyle supporting plate 3 faces one side to be provided with a connecting shaft 31 used for being fixed to the hole 13, and the connecting shaft 31 is provided with an expansion block 32 used for being tightly matched with the hole 13.

The surface of the side wall of the connecting and positioning shaft 1 is provided with teeth 14 along the axial direction; the movable tibial plateau supporting plate 2 is also provided with a window II23 penetrating to the inner wall of the opening, a rotating shaft 24 is arranged in the window II23, and a gear 25 engaged with the teeth 14 is coaxially fixed on the rotating shaft 24; the rotating shaft 24 penetrates out of the side face of the movable tibial plateau supporting plate 2, and an inner hexagonal chuck 26 for applying rotating force to the rotating shaft 24 is arranged at the penetrating end.

The U-shaped bottom of the fixed femoral condyle supporting plate 3 is connected with the connecting shaft 31 through a hinge 5; the axis extension line of the hinge 5 is collinear with the U-shaped central axis of the fixed femoral condyle supporting plate 3.

According to a first embodiment of the measurer for knee replacement surgery shown in fig. 1 to 2, a pointer 37 extends from the top of the connecting shaft 31; a scale 38 for marking the angle between the pointer 37 and the fixed femoral condyle supporting plate 3 is erected on the fixed femoral condyle supporting plate 3.

According to a second embodiment of the knee joint replacement surgery measuring device shown in fig. 1 and 3, the fixed femoral condyle supporting plate 3 is provided with a guide block towards the other side, and the guide block is provided with a drill guide hole 33 towards the installation part of the femoral condyle osteotomy plate. The eccentric guide wheel 34 is further included, and the guide block comprises a guide plate 35 fixed with the fixed femoral condyle supporting plate 3 and an outer sleeve 36 sleeved on the guide plate; a wheel body 341 of the eccentric guide wheel 34 is arranged in the side wall of the outer sleeve 36 in a penetrating way; an oblong hole 351 vertical to the connecting positioning shaft 1 is formed in the guide plate 35, and the mandrel 342 of the eccentric guide wheel 34 penetrates through the oblong hole 351; a locking mechanism is also arranged between the outer sleeve 36 and the guide plate 35; the drill guide hole 33 is provided in the outer sleeve 36. The surface of the guide plate 35 is provided with a projection 352, the projection 352 penetrates through the side wall of the outer sleeve 36, and the surface of the projection 352 is drawn with a scale corresponding to the side wall of the outer sleeve 36. The guide plate 35 of the guide block is connected with an intramedullary rod 4 for penetrating into the femur, and the guide block is provided with a guide groove 353 parallel to the connecting and positioning shaft 1; a cylindrical sliding block 41 is fixed at one end of the intramedullary rod 4, and the sliding block 41 is slidably arranged in the guide groove 353. A scale 6 is vertically arranged on the guide plate 35 of the fixed femoral condyle supporting plate 3, and a sliding ruler 61 for clinging to the cortex of the femoral anterior condyle is arranged on the scale 6.

The use process of the gap measuring balancer in the knee joint replacement surgery comprises the following steps:

a first part: measurement of the straightening gap, using the gap-measuring balancer of the first embodiment

When the extension gap is measured, the osteotomy of the distal femur and the tibial plateau is required to be completed, and the distal femur and the tibial plateau are flat bone surfaces, so that the supporting plate of the gap balancer can be conveniently placed.

Firstly, the knee joint is straightened, and the assembled movable tibial plateau supporting plate 2 and the fixed femoral condyle supporting plate 3 are inserted into the joint gap. The U-shaped gap of the supporting plate is used for the posterior cruciate ligament to pass through. The initial scale corresponding to the moving tibial plateau supporting plate 2 on the connecting and positioning shaft 1 is zero.

The chuck 26 is rotated by a torque wrench until a torque of 30 to 40 pounds (which is close to the natural tension of the ligaments in the straightened state of the knee joint) is reached, and the scale value I indicated by the connecting and positioning shaft 1 is recorded. At the moment, the width from the plane osteotomy surface of the resected femoral anterior condyle to the plane osteotomy surface of the tibial plateau can be measured, and the thickness of the gasket matched with the needed prosthesis can be conveniently calculated.

Then, the deflection angle pointed by the pointer 37 is observed, and if the angle pointed by the pointer 37 is 0, the distal femur osteotomy surface is parallel to the tibial plateau osteotomy surface. If the angle pointed by the pointer 37 is not zero, the instrument is taken out, the inner soft tissue or the outer soft tissue of the knee joint is loosened according to the angle deviation direction, the instrument is put in again after the loosening, the gap is opened by the same torsion, and the angle pointed by the pointer 37 is observed. The above steps are repeated until the pointer 37 points to the zero scale, at which time the tension of the medial and lateral soft tissues is balanced, and the distal femoral osteotomy surface is parallel to the tibial plateau osteotomy surface.

And recording the measured value of the straightening gap on the connecting and positioning shaft 1, and taking out the instrument.

A second part: measurement of buckling gap, with the gap-measuring balancer of the second embodiment

The knee joint is bent by 90 degrees, the intramedullary rod 4 is inserted into the femur along the femoral medullary cavity, and the intramedullary rod 4 moves up and down in the guide groove 353 so as to adapt to the front and rear shafts of the femur with different sizes. And simultaneously, the assembled movable tibial plateau supporting plate 2 and the fixed femoral condyle supporting plate 3 are inserted into the joint gap. The U-shaped gap of the supporting plate is used for the posterior cruciate ligament to pass through. All scale initial scales return to initial values.

The chuck 26 is rotated using a torque wrench until the amount of torque used to straighten the gap before is reached. The scale value II indicated by the coupling alignment shaft 1 is recorded. If the scale value II is the same as the scale value I, the straightening gap and the buckling gap are equal under the same tension condition, and adjustment is not needed. At the moment, the femur is automatically positioned by the external rotation angle, and then the punching of the positioning hole of the four-in-one osteotomy plate of the femoral condyle can be carried out. The internal and external tensions of the flexion gap after osteotomy are equal, and the flexion gap is the same as the extension gap.

If the scale value II is greater or less than the scale value I, the scale value III indicated by the scale should be adjusted by rotating the eccentric guide wheel (34), and the drill guide hole 33 should be moved downward or downwardly so that the sum of the scale value III and the scale value II is equal to the scale value I. At the moment, the femur is automatically positioned by the external rotation angle, and then the punching of the positioning hole of the four-in-one osteotomy plate of the femoral condyle can be carried out. The internal and external tensions of the flexion gap after osteotomy are equal, and the flexion gap is the same as the extension gap.

And after the adjustment is finished, the instrument is taken out, and the femoral condyle four-in-one osteotomy plate is installed according to the position of the positioning hole to perform femoral condyle osteotomy.

The scheme has the advantages over the existing knee joint replacement surgery equipment:

in the prior art, the condyle holding device with similar functions sets the external rotation angle of the femur by using anatomical marks of the femur, the flexion gap osteotomy is unrelated to the extension gap, and the flexion gap soft tissue balance is needed after the osteotomy. In contrast, the gap measuring balancer of the present scheme: 1. the positioning is not carried out by anatomical markers, so that individual difference and subjective feeling difference of operators are avoided; 2. when the flexion and extension clearance is cut, the proximal tibial cut surface is used as a reference, the femoral external rotation cutting is performed parallel to the tibial bone surface, the femoral external rotation angle is automatically positioned according to the tension, and flexion and extension, and the internal and external clearance balance can be ensured after the cutting; 3. the stretching and bending gaps after osteotomy are rectangles with equal width, and the tensions of the inner ligament and the outer ligament are equal.

While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited to the embodiments disclosed, and that various changes and modifications may be made, which are within the scope of the appended claims.

Claims

1. A knee joint replacement surgery measurer is characterized by comprising a connecting positioning shaft (1) with scales (11) in the axial direction, a U-shaped movable tibial plateau supporting plate (2) and a U-shaped fixed femoral condyle supporting plate (3);

the surface of the connecting and positioning shaft (1) is provided with ratchets (12) along the axial direction; a hole (13) is formed at the top end of the connecting and positioning shaft (1);

an opening for a connecting positioning shaft (1) to penetrate is formed in the surface of the U-shaped bottom of the movable tibial platform supporting plate (2); the movable tibial plateau supporting plate (2) is also provided with a windowing I (21) penetrating through the inner wall of the opening, and a pawl (22) of the ratchet (12) is hinged in the windowing I (21);

the U-shaped bottom of the fixed femoral condyle supporting plate (3) faces one side to be provided with a connecting shaft (31) used for being fixed to the hole (13), and an expansion block (32) used for being in close fit with the hole (13) is arranged on the connecting shaft (31).

2. Knee replacement surgery measurer as in claim 1, characterized by the fact that the lateral surface of the connection positioning shaft (1) is axially provided with teeth (14); a windowing II (23) penetrating through the inner wall of the opening is further arranged on the movable tibial platform supporting plate (2), a rotating shaft (24) is arranged in the windowing II (23), and a gear (25) meshed with the teeth (14) is coaxially fixed on the rotating shaft (24); the rotating shaft (24) penetrates out of the side face of the movable tibial plateau supporting plate (2), and a clamping head (26) used for applying rotating force to the rotating shaft (24) is arranged at the penetrating end.

3. Knee replacement surgery measurer as in claim 1 characterized by that the fixed femoral condyle supporting plate (3) is erected with a guide block towards the other side, and the guide block is opened with a drill guide hole (33) towards the femoral condyle osteotomy plate mounting part.

4. The knee replacement surgery measurer as recited in claim 3, further comprising an eccentric guide wheel (34), wherein the guide block comprises a guide plate (35) fixed with the fixed femoral condyle supporting plate (3) and an outer sleeve (36) sleeved on the guide plate; a wheel body (341) of the eccentric guide wheel (34) penetrates through the side wall of the outer sleeve (36); an oblong hole (351) which is vertical to the connecting and positioning shaft (1) is formed in the guide plate (35), and a mandrel (342) of the eccentric guide wheel (34) penetrates through the oblong hole (351); a locking mechanism is further arranged between the outer sleeve (36) and the guide plate (35); the drill guide hole (33) is arranged on the outer sleeve (36).

5. Knee replacement surgery measurer as in claim 4, characterised by that the guide plate (35) is provided with a projection (352) on its face, said projection (352) protruding through the side wall of the casing (36), said projection (352) being provided with a surface which is graduated in correspondence with the side wall of the casing (36).

6. Knee replacement surgery measurer as in claim 3, characterized by the fact that an intramedullary rod (4) for femoral penetration is attached to the guide block.

7. Knee replacement surgery measurer as in claim 6, characterized by the fact that the guide block is provided with a guide slot (353) parallel to the connection positioning axis (1); a cylindrical sliding block (41) is fixed at one end of the intramedullary rod (4), and the sliding block (41) is arranged in the guide groove (353) in a sliding mode.

8. Knee replacement surgery gauge according to claim 1, characterized in that the U-shaped bottom of the fixed femoral condyle plate (3) is connected with the connecting shaft (31) by a hinge (5); the shaft extension line of the hinge (5) is collinear with the U-shaped central axis of the fixed femoral condyle supporting plate (3).

9. Knee replacement surgery measurer according to claim 8, characterised in that a pointer (37) extends from the top of the connection shaft (31); and a dial (38) for marking the angle between the pointer (37) and the fixed femoral condyle supporting plate (3) is vertically arranged on the fixed femoral condyle supporting plate (3).

10. Knee replacement surgery measurer as in claim 1 characterized by that on the fixed femoral condyle support plate (3) a scale (6) is erected, on said scale (6) a sliding ruler (61) is provided for abutting the anterior femoral condyle cortex.