CN113349879B

CN113349879B - Femoral condyle measuring device

Info

Publication number: CN113349879B
Application number: CN202110632509.8A
Authority: CN
Inventors: 王楠; 黄仁宏
Original assignee: Tianyan Medical Equipment Co ltd
Current assignee: Tianyan Medical Equipment Co ltd
Priority date: 2021-06-07
Filing date: 2021-06-07
Publication date: 2022-09-02
Anticipated expiration: 2041-06-07
Also published as: CN113349879A

Abstract

The invention discloses a femoral condyle measurer which comprises a measurer body, wherein the measurer body comprises a fixing part and an adjusting part, a rotating column is arranged at the upper end of the adjusting part, a probe through hole is formed in the upper part of the rotating column, a probe extends into the probe through hole, a locking attachment through hole is formed in the rotating column in the direction perpendicular to the probe through hole, the probe through hole is communicated with the locking attachment through hole, a first locking attachment is arranged in the locking attachment through hole in a sliding mode, a second locking attachment is further arranged in the locking attachment through hole, and a spring is arranged between the first locking attachment and the second locking attachment. In the invention, the action force of the spring on the second locking block enables the probe corresponding groove on the second locking block to generate an interference effect with the probe, and the probe corresponding groove is combined with the probe through hole to lock the probe, so that the tilting, the autorotation and the like of the probe are avoided, and the probe head of the probe is stable and controllable.

Description

Femoral condyle measuring device

Technical Field

The invention relates to the technical field of medical instruments, in particular to a femoral condyle measuring device.

Background

The knee joint is an important weight bearing joint of the lower limb, and the structure and function of the knee joint are the most complicated of the joints of the human body. Degenerative knee joint arthropathy is a common disease of the elderly, and more patients need artificial knee joint replacement for serious knee joint osteoarthritis. Knee replacement can relieve knee pain, improve knee function, correct knee deformity and achieve long-term stability.

In a knee joint replacement operation, the distal femur needs to be cut, then the femoral condyle prosthesis is installed at the distal femur, and the femoral condyle prosthesis is used for replacing the femoral condyle to restore the function of the knee joint. The osteotomy of the distal end of the femur comprises a first platform osteotomy and a second four-in-one osteotomy, after the first platform osteotomy is completed, the femoral condyle measurer is placed at the platform to determine the osteotomy position, the osteotomy amount and the eversion angle of the four-in-one osteotomy, and then the four-in-one osteotomy is completed by the aid of the four-in-one osteotomy block matched with the bone saw.

The current femoral condyle measuring device has some disadvantages:

the measuring method of the femoral condyle measurer comprises the following steps: the femur and the tibia are in a flexion state, and the osteotomy amount is measured by using a probe of a femoral condyle measuring instrument, namely, the lowest position of the anterior condyle osteotomy is detected. When the traditional femur condyle measuring device is used for measuring, the probe and the femur condyle measuring device are in a vertical state, and an elevation angle exists between the upper end surface of the femur condyle prosthesis and the horizontal plane, so that the osteotomy amount measured by the probe is larger than the osteotomy amount theoretically required by using the traditional femur condyle measuring device, and the osteotomy position is inaccurate:

two, ideal thighbone condyle caliber, it only allows rotation and flexible on the horizontal plane to exist between its probe and the caliber body, guarantee promptly that the probe of probe is in the coplanar all the time in adjustment process, so, the osteotomy volume that the probe was measured is the osteotomy volume that the scale is shown, be the osteotomy volume that is closest to theoretical value, and traditional thighbone condyle caliber, its probe has the perk, the clearance of rotation even, there is vertical direction's shake or rotation in the probe that makes the probe, lead to measuring to cut the osteotomy volume and theoretical and cut the osteotomy volume between the error, and then lead to the mismatching between thighbone condyle prosthesis and the thighbone:

thirdly, traditional thighbone condyle caliber, can not dismantle between its caliber body and the probe structure, when arranging thighbone condyle caliber in the thighbone distal end, need adjust earlier the probe and make the probe be higher than the anterior condyle, fixed the caliber body again, adjust the probe at last and confirm the osteotomy volume, operation process is comparatively loaded down with trivial details, and probe is probably to take place to interfere with the anterior condyle in the operation process simultaneously, leads to the fixed process of caliber body to be disturbed, increases operation time.

Based on the defects, the invention provides the femoral condyle measuring device which can avoid the probe from shaking, has high detection precision and is simple and convenient to use.

Disclosure of Invention

The present invention is directed to a femoral condyle measuring instrument, which solves the above problems of the prior art.

In order to solve the technical problems, the invention provides the following technical scheme: the thighbone condyle measuring device comprises a measuring device body, wherein the measuring device body comprises a fixing part and an adjusting part, the fixing part is fixed on a osteotomy platform obtained by first osteotomy of the far end of a thighbone, the adjusting part can move up and down along the fixing part to drive a probe to move up and down, the osteotomy amount of the four-in-one osteotomy is determined according to the indication of the probe, a rotating column is arranged at the upper end of the adjusting part and is rotatably arranged at the upper end of the adjusting part to drive the probe to rotate in the same plane, a probe through hole is formed in the upper part of the rotating column, the probe is arranged in the probe through hole in an extending mode and is used for detecting the lowest position of the front condyle osteotomy, the position is judged by experience of a doctor, a locking block through hole is arranged on the rotating column in the direction perpendicular to the probe through hole, the probe through hole is communicated with the locking block through hole, and a first locking block is arranged in the locking block through hole in a sliding mode, the first locking block can slide in the through hole of the first locking block, the second locking block is further arranged in the through hole of the first locking block, a spring is arranged between the first locking block and the second locking block, the spring is in a compressed state, the resilience force of the spring acts on the first locking block and the second locking block to form opposite acting force on the first locking block and the second locking block, the upper part of the second locking block is provided with a probe corresponding groove, one side of the probe corresponding groove is provided with a locking inclined plane, the position of the lower part of the probe corresponding to the locking inclined plane is provided with a matching inclined plane, the shapes of the locking inclined plane and the matching inclined plane are complementary, the matching inclined plane and the locking inclined plane are in mutual contact, the acting force of the spring on the second locking block enables the interference effect to be generated between the locking inclined plane on the second locking block and the matching inclined plane of the probe, and the locking inclined plane is combined with the probe through hole to lock the probe, the tilting, the autorotation and the like of the probe are avoided, so that the probe of the probe is stable and controllable; when the telescopic amount of the probe needs to be adjusted, the probe is manually driven, the second locking block drives the locking inclined plane to generate an interference effect on the matching inclined plane under the acting force of the spring, namely the locking inclined plane and the matching inclined plane are in mutual contact, the tilting or autorotation of the probe is limited by combining the effect of the probe through hole on the probe, and the probe is pushed or pulled under a certain limiting effect to complete telescopic adjustment.

Preferably, the post protruding through-hole has been seted up to the rotation post lower part, post protruding through-hole and lock annex through-hole intercommunication, the position that regulating part upper end and post protruding through-hole correspond is provided with the post protruding, the post is protruding to be gone into in the post protruding through-hole, a lock annex lower part is provided with post protruding lock and attaches the groove, post protruding lock attaches groove and post protruding mutual contact, the spring makes the post protruding lock on a lock annex attach the groove on a lock annex and produce the limiting displacement between the post protruding to the effort of a lock annex, and post protruding lock attaches groove combination post protruding through-hole and locks the post protruding, avoids rotating the post and rotates at will, and when needing the turned angle of adjusting probe, manual rotation rotates the post, makes the rotation post rotate under certain limiting displacement, drive the probe rotate can.

Preferably, the column protrusion comprises a base column and a stop, the base column is smoothly connected with the stop, a limiting effect is formed between an inclined plane formed at the smooth connection position and the column protrusion locking groove, the column protrusion locking groove is in contact with the lower end of the stop, and the stop extends into the upper end of the column protrusion locking groove and can prevent the column protrusion from falling out of the rotating column.

Preferably, a lock attaches the piece and includes that two are one number stretch into arm and butt piece No. one, stretch into arm sliding connection in lock attaches the piece through-hole No. one number, No. one the butt piece is located outside the lock attaches the piece through-hole, No. two lock attaches the piece and includes that two are No. two stretch into arms and No. two butt pieces, No. two stretch into in the arm stretches into lock attaches the piece through-hole, No. two the butt piece is located outside the lock attaches the piece through-hole, the spring is in between a butt piece and No. two butt pieces, a butt piece and No. two butt pieces can not stretch into in the lock attaches the piece through-hole, the one end that keeps away from each other of a butt piece and No. two butt pieces is the concave surface, and convenient staff is controlled a lock and attaches the piece No. two.

Preferably, the position that is located two one numbers in the lock annex through-hole and stretches into between the arm is provided with the guide piece, the guide piece is used for guiding the removal of a lock annex, avoids a lock annex when pressing the spring, appears wrench movement or rotates, two the one end lower part that an arm was kept away from a piece of support is provided with the lug for stretching into, the position that corresponds with the lug in the lock annex through-hole is provided with the guiding groove, lug and guiding groove are used for guiding the removal of a lock annex, avoid a lock annex to deviate from under the effect of spring outside the lock annex through-hole simultaneously.

Preferably, the observation groove has been seted up to the rotation post upper end, observation groove and probe through-hole intercommunication, the position that the probe corresponds with the observation groove is provided with the scale, observation groove and scale are used for assisting doctor to observe the flexible volume of probe, avoid doctor to the great error of the judgement appearance of anterior condyle osteotomy extreme low order.

Preferably, an elevation angle alpha exists between the central axis of the probe and the horizontal plane, the degree of the elevation angle alpha is usually 5 degrees, and the elevation angle is fit with the elevation angle of the upper end surface of the femoral condyle prosthesis, so that the osteotomy amount detected by the probe is close to a theoretical value, and mismatching between the femoral condyle and the femur is avoided.

Preferably, the fixed part lower extreme is provided with the back condyle and embraces the piece tightly, the back condyle is embraced the piece and is used for embracing thighbone distal end back condyle tightly to this is fixed the fixed part, also can further be fixed in the fixed part on the osteotomy platform through screw and screw, the fixed part both sides are stretched out and are provided with down the visual reference surface of osteotomy, the regulation portion both sides are stretched out and are provided with the visual reference surface of osteotomy, the regulation portion removes to drive the visual reference surface of osteotomy and removes, confirms down the distance between the visual reference surface of osteotomy and the visual reference surface of last osteotomy, and size, the model of the volume of cutting the bone and thighbone condyle prosthesis have been decided to this distance.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention discloses a femoral condyle measurer which is provided with a first locking block, a second locking block, a spring, a cylindrical protrusion and other structures, wherein the action force of the spring on the second locking block enables an interference effect to be generated between a locking inclined plane on the second locking block and a matching inclined plane of a probe, the locking inclined plane is combined with a probe through hole to lock the probe, and tilting, autorotation and the like of the probe are avoided; meanwhile, the acting force of the spring on the first locking piece enables an interference effect to be generated between the column convex locking groove and the column convex on the first locking piece, the column convex locking groove is combined with the column convex through hole to lock the column convex, the random rotation of the rotating column is avoided, and the random rotation of the probe is avoided; the probe of the probe is ensured to be always positioned on the same plane in the adjusting process, so that the osteotomy amount measured by the probe is closest to the osteotomy amount of a theoretical value, the detection precision of the probe is improved, and mismatching between the femoral condyle prosthesis and the femur is avoided to a certain extent;

2. according to the femur condyle measurer disclosed by the invention, the elevation angle alpha exists between the central axis of the probe and the horizontal plane, so that the central axis of the probe accords with the central axis of the upper end surface of the femur condyle prosthesis, and the osteotomy amount obtained by measuring by using the probe with the elevation angle is closer to the osteotomy amount theoretically required, namely, the measurement is more accurate;

3. when the femoral condyle measuring device is arranged at the distal end of a femur, the fixed part and the adjusting part can firstly embrace the posterior femoral condyle, namely the fixed part and the adjusting part are fixed, and then the rotating column is pressed on the column protrusion.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of the use of the femoral condylar measurer of the present invention;

FIG. 2 is a perspective view of the femoral condyle measurer of the present invention;

FIG. 3 is a perspective view of the rotating post of the present invention;

FIG. 4 is a perspective view of the first locking block, the second locking block and the spring of the present invention;

FIG. 5 is a perspective view of a second lock attachment block of the present invention;

FIG. 6 is a front view of a probe of the present invention;

FIG. 7 is a perspective view of the first locking piece of the present invention;

FIG. 8 is a perspective view of the adjustment portion of the present invention;

FIG. 9 is a side view of the femoral condylar gauge of the present invention;

in the figure: a fixed part-1; an adjustment part-2; a rotating column-3; a probe through hole-4; probe-5; a locking block through hole-6; a first lock attachment block-7; a second locking block-8; a spring-9; the probe corresponds to the groove-10; a column convex through hole-11; column convex-12; a post convex locking attachment groove-13; a pillar-14; a stop-15; the first arm extends into the arm-16; the first abutting block-17; the second arm extends into the arm-18; a second abutting block-19; a guide block-20; a bump-21; a guide groove-22; observation tank-23; scale-24; posterior condylar fastening sheet-25; lower osteotomy visual reference plane-26; upper osteotomy visual reference plane-27; locking inclined plane-28; distal femur-29; tibia-30; matching ramp-31.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment is as follows: the invention provides a technical scheme, as shown in figures 1-6, a femoral condyle measuring device comprises a measuring device body, the measuring device body comprises a fixing part 1 and an adjusting part 2, the fixing part 1 is fixed on a osteotomy platform obtained by first osteotomy of the distal end of a femur, the adjusting part 2 can move up and down along the fixing part 1 to drive a probe 5 to move up and down, the osteotomy amount of the four-in-one osteotomy is determined according to the indication of the probe, a rotating column 3 is arranged at the upper end of the adjusting part 2, the rotating column 3 is rotatably arranged at the upper end of the adjusting part 2 to drive the probe 5 to rotate in the same plane, a probe through hole 4 is arranged at the upper part of the rotating column 3, the probe through hole 4 is internally provided with the probe 5 in a stretching way, the probe 5 is used for detecting the lowest position of the anterior condyle osteotomy, the position is judged by the experience of a doctor, a locking block through hole 6 is arranged on the rotating column 3 in the direction vertical to the probe through hole 4, the probe through hole 4 is communicated with the locking block through hole 6, a first locking block 7 is arranged in the locking block through hole 6 in a sliding manner, the first locking block 7 can slide in the locking block through hole 6, a second locking block 8 is arranged in the locking block through hole 6, a spring 9 is arranged between the first locking block 7 and the second locking block 8, the spring 9 is in a compressed state, the resilience force of the spring 9 acts on the first locking block 7 and the second locking block 8 to form opposite acting force on the first locking block 7 and the second locking block 8, a probe corresponding groove 10 is arranged at the upper part of the second locking block 8, a locking inclined plane 28 is arranged at one side of the probe corresponding groove 10, a matching inclined plane 31 is arranged at the position of the lower part of the probe 5 corresponding to the locking inclined plane 28, the locking inclined plane 28 is complementary with the matching inclined plane 31 in shape, the matching inclined plane 31 of the probe 5 is contacted with the locking inclined plane 28, and the acting force of the spring 9 on the second locking block 8 enables the locking inclined plane 28 on the second locking block 8 to generate an interference effect with the matching inclined plane 31 of the probe 5, the locking inclined plane 28 is combined with the probe through hole 4 to lock the probe 5, so that the tilting, autorotation and the like of the probe 5 are avoided, and the probe of the probe 5 is stable and controllable.

As shown in fig. 3 and 7-8, a column convex through hole 11 is formed in the lower portion of the rotating column 3, the column convex through hole 11 is communicated with the locking attachment through hole 6, a column protrusion 12 is arranged at a position, corresponding to the column convex through hole 11, of the upper end of the adjusting portion 2, the column protrusion 12 extends into the column convex through hole 11, a column convex locking attachment groove 13 is formed in the lower portion of the first locking attachment 7, the column convex locking attachment groove 13 is in contact with the column protrusion 12, the column convex locking attachment groove 13 and the column protrusion 12 are in interference action with the acting force of the spring 9 on the first locking attachment 7, the column convex locking attachment groove 13 is combined with the column convex through hole 11 to lock the column protrusion 12, the rotating column 3 is prevented from rotating randomly, when the rotating angle of the probe 5 needs to be adjusted, the rotating column 3 is manually rotated, so that the rotating column 3 rotates under certain interference action to drive the probe 5 to rotate.

As shown in fig. 8, the stud protrusion 12 includes a base stud 14 and a stop 15, the base stud 14 and the stop 15 are connected smoothly, an interference effect is formed between an inclined surface formed at the smooth connection and the stud protrusion locking groove 13, the stud protrusion locking groove 13 contacts with the lower end of the stop 15, and the stop 15 extends into the upper end of the stud protrusion locking groove 13, so as to prevent the stud protrusion 12 from falling out of the rotary stud 3.

As shown in fig. 4, the first locking piece 7 comprises two first extending arms 16 and a first abutting block 17, the first extending arm 16 is slidably connected into the locking piece through hole 6, the first abutting block 17 is located outside the locking piece through hole 6, the second locking piece 8 comprises two second extending arms 18 and a second abutting block 19, the second extending arm 18 extends into the locking piece through hole 6, the second abutting block 19 is located outside the locking piece through hole 6, the spring 9 is located between the first abutting block 17 and the second abutting block 19, the first abutting block 17 and the second abutting block 19 cannot extend into the locking piece through hole 6, one end, away from each other, of the first abutting block 17 and the second abutting block 19 is a concave surface, and the first locking piece 7 and the second locking piece 8 can be conveniently held by a hand.

As shown in fig. 3 and 7, a guide block 20 is arranged at a position between two first extension arms 16 in the locking block through hole 6, the guide block 20 is used for guiding the movement of the first locking block 7, so that the first locking block 7 is prevented from twisting or rotating when the spring 9 is pressed, a bump 21 is arranged at the lower part of one end of each of the two first extension arms 16, which is far away from the first abutting block 17, a guide groove 22 is arranged at a position in the locking block through hole 6, which corresponds to the bump 21, the bump 21 and the guide groove 22 are used for guiding the movement of the first locking block 7, and the first locking block 7 is prevented from being separated from the locking block through hole 6 under the action of the spring 9.

As shown in fig. 2 and 3, the upper end of the rotating column 3 is provided with an observation groove 23, the observation groove 23 is communicated with the probe through hole 4, the probe 5 is provided with a scale 24 at a position corresponding to the observation groove 23, and the observation groove 23 and the scale 24 are used for assisting a doctor to observe the expansion and contraction amount of the probe 5, so that the doctor is prevented from making a large error in the judgment of the lowest position of the anterior condyle osteotomy.

As shown in fig. 9, an elevation angle α exists between the central axis of the probe 5 and the horizontal plane, the degree of the elevation angle α is usually 5 °, and the elevation angle fits the elevation angle of the upper end surface of the femoral condyle prosthesis, so that the osteotomy amount detected by the probe 5 approaches to a theoretical value, and the mismatch between the femoral condyle and the femur is avoided.

As shown in fig. 2, the lower end of the fixing part 1 is provided with a posterior condylar fastening sheet 26, the posterior condylar fastening sheet 26 is used for fastening the distal posterior condyles of the femur, so as to fix the fixing part 1, the fixing part 1 can be further fixed on the osteotomy platform through screw holes and screws, lower osteotomy visual reference surfaces 27 are arranged on two sides of the fixing part 1 in an extending manner, upper osteotomy visual reference surfaces 28 are arranged on two sides of the adjusting part 2 in an extending manner, the adjusting part 2 moves to drive the upper osteotomy visual reference surfaces 28 to move, and the distance between the lower osteotomy visual reference surfaces 27 and the upper osteotomy visual reference surfaces 28 is determined, and the distance determines the osteotomy amount and the size and the model of the femoral condylar prosthesis.

The working principle of the invention is as follows: referring to fig. 1, the fixing part 1 and the adjusting part 2 are fixed on the osteotomy platform obtained by the first osteotomy of the distal femur 29, namely, the posterior condylar fastening piece 25 extends into the posterior condyle, the fixing part 1 can be further fixed on the osteotomy platform through a screw hole and a screw, then the rotating column 3 is pressed on the column projection 12 in a pressing mode, the probe 5 is adjusted, the probe 5 drives the adjusting part 2 to move up and down, and when the probe 5 detects the lowest position of the anterior condylar osteotomy, the distance between the lower osteotomy visual reference surface 27 and the upper osteotomy visual reference surface 28 determines the osteotomy amount and the size and the model of the femoral condylar prosthesis;

when the telescopic amount of the probe 5 needs to be adjusted, the probe 5 is manually driven, the second locking block 8 drives the locking inclined plane 28 to generate an interference effect on the matching inclined plane 31 under the action of the spring 9, namely, the locking inclined plane 28 and the matching inclined plane 31 are mutually contacted, and the probe 5 is limited from tilting or autorotation under the action of the probe through hole 4 on the probe 5, so that the probe 5 is pushed or pulled under a certain limiting effect, and the telescopic adjustment is completed;

when the rotation angle of the probe 5 needs to be adjusted, the rotating column 3 is manually rotated, so that the rotating column 3 rotates under a certain interference effect, and the probe 5 is driven to rotate.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Thighbone condyle caliber, including the caliber body, its characterized in that: the measurer body comprises a fixing part (1) and an adjusting part (2), a rotating column (3) is arranged at the upper end of the adjusting part (2), a probe through hole (4) is formed in the upper part of the rotating column (3), a probe (5) is arranged in the probe through hole (4) in a stretching mode, a locking block through hole (6) is formed in the rotating column (3) in a direction perpendicular to the probe through hole (4), the probe through hole (4) is communicated with the locking block through hole (6), a first locking block (7) is arranged in the locking block through hole (6) in a sliding mode, a second locking block (8) is further arranged in the locking block through hole (6), a spring (9) is arranged between the first locking block (7) and the second locking block (8), a probe corresponding groove (10) is formed in the upper part of the second locking block (8), a locking inclined plane (28) is arranged on one side of the probe corresponding groove (10), the probe is characterized in that a matching inclined surface (31) is arranged at the position, corresponding to the locking inclined surface (28), of the lower portion of the probe (5), the locking inclined surface (28) is complementary to the matching inclined surface (31), the matching inclined surface (31) is in contact with the locking inclined surface (28), and the spring (9) acts on the second locking block (8) to enable the locking inclined surface (28) on the second locking block (8) to generate an interference effect with the matching inclined surface (31) of the probe (5).

2. The femoral condylometer of claim 1, wherein: the rotary column is characterized in that a column convex through hole (11) is formed in the lower portion of the rotary column (3), the column convex through hole (11) is communicated with a locking block through hole (6), a column convex groove (12) is formed in the position, corresponding to the column convex through hole (11), of the upper end of the adjusting portion (2), a column convex locking block attaching groove (13) is formed in the lower portion of the locking block (7), and the column convex locking attaching groove (13) and the column convex groove (12) are in mutual contact.

3. The femoral condylometer of claim 2 wherein: the column protrusion (12) comprises a base column (14) and a stop (15), the base column (14) and the stop (15) are smoothly connected, and the column protrusion locking groove (13) is in contact with the lower end of the stop (15).

4. The femoral condylometer of claim 1, wherein: a lock attaches piece (7) and includes that two are stretched into arm (16) and butt piece (17) No. one, stretch into arm (16) sliding connection in lock attaches piece through-hole (6) No. one, butt piece (17) are located outside lock attaches piece through-hole (6), No. two lock attaches piece (8) including two stretch into arm (18) and No. two butt piece (19), No. two stretch into arm (18) and stretch into in lock attaches piece through-hole (6), No. two butt piece (19) are located outside lock attaches piece through-hole (6), spring (9) are in between butt piece (17) and No. two butt piece (19).

5. The femoral condylometer of claim 4, wherein: the position that is located two one numbers in lock annex through-hole (6) and stretches into between arm (16) is provided with guide block (20), two one number stretches into arm (16) and keeps away from one end lower part of piece (17) and is provided with lug (21), the position that corresponds with lug (21) in lock annex through-hole (6) is provided with guiding groove (22).

6. The femoral condylometer of claim 1, wherein: an observation groove (23) is formed in the upper end of the rotating column (3), the observation groove (23) is communicated with the probe through hole (4), and scales (24) are arranged at the positions, corresponding to the observation groove (23), of the probe (5).

7. The femoral condylometer of claim 1, wherein: an elevation angle alpha exists between the central axis of the probe (5) and the horizontal plane.

8. The femoral condylometer of claim 1, wherein: the fixing part (1) lower extreme is provided with back condyle cohesion piece (25), fixed part (1) both sides are stretched out and are provided with down osteotomy visual reference surface (26), regulation portion (2) both sides are stretched out and are provided with upper osteotomy visual reference surface (27).