JP6336811B2 - Artificial knee joint installation jig - Google Patents

Description

  The present invention relates to an implant placement jig, and more particularly to an artificial knee joint placement jig.

  Artificial knee joints are sometimes used to treat patients who have osteoarthritis or chronic rheumatism due to wear of the knee cartilage. FIG. 8 is a schematic side cross-sectional view showing a femur and a tibia in which an artificial knee joint is installed. As shown in FIG. 8, the knee prosthesis 100 includes a femur F so as to cover the tibial tray 102 and the surface liner 104 fixed to the proximal end Ta of the tibia T and the distal end Fa of the femur F. And a femoral component 106 secured to the body. In some cases, a spacer (not shown) is inserted between the tibial tray 102 and the tibia T. The femur F and the tibia T are connected to each other by a ligament (not shown) arranged on both the left and right sides and pulled from each other, whereby the femoral component 106 is pressed against the surface liner 104. In such an artificial knee joint 100, the femoral component 106 slides along the surface liner 104 when the knee is moved between a bent position (flexion position) and an extended position (extension position). Since the size of the femur F varies from patient to patient, several different sizes of knee prosthesis 100 are prepared.

  FIG. 9 is a schematic side view showing the tibia and femur partially cut away for placement of the knee prosthesis. As shown in FIG. 9, the proximal end Ta of the tibia T has an installation surface for removing the worn cartilage and fixing the tibial tray 102 to the tibia T, that is, the proximal end surface Tb. Has been excised to form. Similarly, the distal end Fa of the femur F is used to remove worn cartilage and to form five mounting surfaces Fb1-Fb5 for securing the femoral component 106 to the femur F. Has been excised. The five installation surfaces are a distal end surface Fb1, a front installation surface Fb2 and a rear installation surface Fb3 perpendicular to the distal end surface Fb1, and a distal end surface Fb1, a front installation surface Fb2, and a rear installation surface Fb3. Two inclined installation surfaces Fb4 and Fb5. In general, the proximal end surface Tb of the tibia T and the distal end surface Fb1 of the femur F are formed at predetermined distances LT and LF from the proximal end of the tibia T and the distal end of the femur, respectively. Is done. On the other hand, the positions of the installation surfaces Fb <b> 2 to Fb <b> 5 of the femur F change according to the size of the artificial knee joint 100.

  In recent years, in order to secure an appropriate ligament balance in the installation of an artificial knee joint, an artificial knee joint installation jig (balancer device) is generally used. Thereby, an appropriate installation position of the artificial knee joint 100 is determined. Specifically, the front installation surface Fb2, the rear installation surface Fb3, and the inclined installation surfaces Fb4, Fb5 of the femur F for attaching the femoral component 106 are determined. The position is determined (see, for example, Patent Document 1).

  The artificial knee joint installation jig described in Patent Document 1 uses an intramedullary rod that is inserted into the medullary cavity of the femur as the pivot of the femur.

Japanese Patent Application Laid-Open No. 2007-075517

  In cases where the curvature of the femur is large or in cases where an artificial hip joint stem is inserted, the intramedullary rod may not be inserted into the medullary cavity. However, even in such cases, there is a demand to use an artificial knee joint installation jig in order to ensure an appropriate ligament balance. In recent years, jigs such as intramedullary rods have not been inserted into the medullary canal to reduce the risk of complications (fatty embolism syndrome or bleeding that may occur due to migration of liposcopic bone marrow fragments to the lungs). A technique is required.

  Accordingly, an object of the present invention is to provide an artificial knee joint installation jig that can be used without inserting an intramedullary rod into the medullary cavity.

  Another object of the present invention is to provide an artificial knee joint installation jig that can be used without inserting an intramedullary rod into the medullary cavity and that is easy for an operator to use.

  In order to achieve the above object, an artificial knee joint installation jig according to the present invention is an artificial knee joint installation jig used when the knee is in a flexed position, and includes a femoral attachment part attached to the femur, and a resection A jig body that abuts on the proximal end surface of the tibia formed by the thighbone, and the femoral attachment portion and the jig body for creating a predetermined tension state in the ligament that connects the tibia and the femur The femoral attachment portion is attached to the distal end surface of the femur formed by resection, and is connected to each other so as to be movable in a direction perpendicular to the proximal end surface of the tibia and lockable at an arbitrary relative position. A plate member having a first contact surface that contacts the distal end surface of the femur and a second contact surface opposite to the first contact surface; The jig body is in contact with the second contact surface. That.

  According to the artificial knee joint installation jig configured as described above, the plate member is attached to the distal end surface of the femur. The first contact surface of the plate member contacts the distal end surface of the femur, so that the second contact surface of the plate member is disposed in parallel with the distal end surface of the femur. When the jig body abuts on the second abutment surface, the femoral attachment and the jig body are perpendicular to the proximal end surface of the tibia along a second abutment surface parallel to the distal end surface of the femur. Relative movement in any direction. Thus, it is possible to ensure an appropriate ligament balance using the artificial knee joint installation jig without inserting an intramedullary rod into the medullary cavity.

  In the embodiment of the artificial knee joint installation jig according to the present invention, preferably, the plate member extends rearward from the first contact surface and contacts the femur between the two posterior condyles of the femur. A protrusion and a pushing protrusion extending rearwardly from the first abutment surface and being pushed into the distal end surface of the femur.

  In the artificial knee joint installation jig configured as described above, the position between the two posterior condyles of the femur serves as a reference position for attaching the plate member to the femur. Thereby, the attachment position of the plate member with respect to the femur becomes substantially the same for each case, and it becomes possible to ensure an appropriate ligament balance regardless of the case.

  In the embodiment of the artificial knee joint placement jig according to the present invention, preferably, the femoral attachment portion further includes a hook member removably coupled to the plate member, and the jig body includes a proximal end surface of the tibia and The hook member is connected to the hook member so as to be movable in the vertical direction and to be locked at an arbitrary relative position.

  In the artificial knee joint installation jig configured as described above, after the plate member is attached to the femur, the jig body is connected to the plate member in a state where the jig body is connected to the hook member. Can be attached to a member. Thus, an artificial knee joint jig that is easy to use for an operator is provided.

  In the embodiment of the artificial knee joint installation jig according to the present invention, preferably, the hook member has a connecting shaft portion extending in the front-rear direction, the plate member has a long hole for receiving the connecting shaft portion, and the hook member is The connecting shaft portion is rotatable about the connecting shaft portion in a state where the connecting shaft portion is in contact with the upper end portion of the long hole.

  In the artificial knee joint installation jig configured as described above, the hook member can rotate around the connecting shaft portion, so that the jig body can be rotated around the connecting shaft portion according to the tension state of the ligament. is there. The position of the connecting shaft at this time is preferably the position of the medullary cavity of the femur.

  In an embodiment of the artificial knee joint installation jig according to the present invention, preferably, the jig body is provided with a spacer disposed on a proximal end surface of the tibia, a releasably connected to the spacer, and a second of the plate member. A movable block that abuts against the abutment surface, and the femoral attachment portion and the movable block can be moved relative to each other in a direction perpendicular to the proximal end surface of the tibia and can be locked at an arbitrary relative position. Connected to each other.

  In an artificial knee joint installation jig configured in this way, the jig body can be separated into a spacer and a movable block, so even if the part of the patient's knee incised to install the artificial knee joint is small, By first attaching the movable block to the femur and subsequently inserting the spacer, the artificial knee joint placement jig can be placed on the patient's knee. Thereby, an axial term knee joint installation jig easy to use for the surgeon is provided.

  In the embodiment of the artificial knee joint installation jig according to the present invention, preferably, the spacer includes a spacer main body including an upper surface abutting on the movable block, a bracket extending upward from the spacer main body, and a support portion parallel to the upper surface and front and rear. A movable block having a lower surface that contacts the upper surface of the spacer body, an insertion hole into which the pin is inserted in a fitted state in a state where the lower surface and the upper surface of the spacer body are in contact with each other, Have

  In the artificial knee joint installation jig configured as described above, after the movable block is first installed on the femur, the spacer is moved in the front-rear direction while the lower surface of the movable block and the upper surface of the spacer are in contact with each other. By inserting this pin into the insertion hole of the movable block, relative movement in the vertical direction and the horizontal direction between the movable block and the spacer is prevented. Further, the relative movement in the front-rear direction between the movable block and the spacer is also limited by friction between the spacer and the tibia and the movable block. Thus, the artificial knee joint can be easily fixed to the movable block and is easy for the operator to use. The up-down direction is the direction in which the tibia extends, and the front-back direction and the left-right direction are the patient's front-back direction and left-right direction in the tibia, respectively.

  In an embodiment of an artificial knee joint placement jig according to the present invention, an optional jig for determining the size of the femoral component is preferably attached to the movable block.

  In the artificial knee joint installation jig configured as described above, after securing an appropriate ligament balance, the size of the artificial knee joint can be determined using an option jig that is easy for the operator to use.

  According to the present invention, it is possible to provide an artificial knee joint placement jig that can be used without inserting an intramedullary rod into the medullary cavity. Further, according to the present invention, it is possible to provide an artificial knee joint installation jig that can be used without inserting an intramedullary rod into the medullary cavity and that is easy for an operator to use.

1 is a perspective view of an artificial knee joint jig according to the present invention attached to a knee in a bent position. FIG. 1 is a partially exploded perspective view of an artificial joint jig according to the present invention. FIG. It is sectional drawing of a movable block and a femur attachment part. It is a top view of a movable block. It is a perspective view of the plate member attached to the femur. It is a perspective view of various option jigs. It is a perspective view of the attachment tool which grips a plate member. It is a schematic side sectional view showing a femur and a tibia in which an artificial knee joint is installed. 1 is a schematic side view showing a tibia and a femur partially cut away. FIG.

  Hereinafter, an embodiment of an artificial knee joint installation jig according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an artificial knee joint installation jig which is an embodiment of the present invention attached to a knee in a bent position. FIG. 2 is a partially exploded perspective view of the artificial knee joint installation jig according to the present invention. In the following description of the artificial knee joint installation jig itself, the direction in which the tibia T extends is referred to as the vertical direction A, and the front-rear direction and the left-right direction of the patient in the tibia T are referred to as the front-rear direction B and the left-right direction C, respectively. Therefore, in the bending position, the femur F side with respect to the tibia T is the posterior side.

  As shown in FIG. 1, the jig 1 includes a femur attachment portion 2 attached to the femur F, and a jig body 4 that abuts on a proximal end face Tb of the tibia T formed by resection. . As will be described later, the femoral attachment portion 2 and the jig body 4 are arranged in a direction perpendicular to the proximal end surface Tb of the tibia T in order to generate a predetermined tension state in the ligament that connects the tibia T and the femur F (see FIG. They are connected to each other so that they can move relative to each other in the vertical direction A and can be locked at any relative position.

  As shown in FIG. 2, the femoral attachment 2 includes a plate member 6 and a hook member 8 that is detachably coupled to the plate member 6. The plate member 6 includes a first abutment surface 6a that abuts on the distal end surface Fb1 of the femur F formed by resection, and a second abutment on the opposite side parallel to the first abutment surface 6a. It has a surface 6b. The hook member 8 has a cylindrical portion 8a, and a screw thread 10 is formed on a portion of the cylindrical portion 8a opposite to the plate member 6. Other structures of the plate member 6 and the hook member 8 will be described in detail later.

  The jig body 4 includes a spacer 12 disposed on the proximal end surface Tb of the tibia T, and a movable block 14 that is detachably connected to the spacer 12 and abuts on the second abutment surface 6b of the plate member 6. Yes.

  The spacer 12 has a spacer main body 18 and a plurality of additional spacers 20 (see FIG. 1) rotatably attached to the spacer main body 18 so as to be able to overlap the spacer main body 18.

  The spacer main body 18 has a lower surface 18 a that contacts the proximal end surface Tb of the tibia T, an upper surface 18 b that contacts the movable block 14, and a handle portion 22. The lower surface 18a and the upper surface 18b are arranged in parallel to each other with a predetermined distance therebetween. The lower surface 18a is preferably relatively large in order to ensure the stability of the tibia T and the jig body 4, but the upper surface 18b ensures a view during surgery if the connection with the movable block 14 is ensured. Therefore, it is preferable that it is relatively small. Therefore, in this embodiment, most of the upper surface side portion of the spacer body 18 is removed (see FIG. 2).

  The additional spacer 20 is rotatably attached to the handle portion 22 via a pin 20a. The thickness of the additional spacer 20 is preferably the same thickness as a spacer (not shown) that is selectively inserted between the tibial tray 102 and the tibia T.

  The spacer 12 further has a connecting portion 24 that connects the spacer 12 and the movable block 14. The connecting portion 24 includes a support portion 26 that extends upward from the spacer body 18, and two pins 28 that extend in the front-rear direction B from the support portion 26 in parallel with the upper surface 18 b of the spacer body 18 and in parallel with each other. A handle 16 is removably attached to the connecting portion 24 of the spacer 12.

  The movable block 14 has a lower surface 14a that contacts the upper surface 18b of the spacer body 18, a rear surface 14b that contacts the second contact surface 6b of the plate member 6, and a front surface 14c opposite to the rear surface. The lower surface 14a, the rear surface 14b, and the front surface 14c are perpendicular to each other, and the rear surface 14b and the front surface 14c are parallel to each other. The lower surface 14a of the movable block 14 is preferably aligned with the posterior installation surface Fb3 of the femur. The support portion 26 of the spacer main body 18 can contact the front surface 14c, and the two pins 28 are inserted in a fitted state with the lower surface 14a of the movable block 14 and the upper surface 18b of the spacer main body 18 in contact with each other. As a result, when the pin 28 is inserted into the insertion hole 30, the vertical direction A and the horizontal direction C between the movable block 14 and the spacer body 18 are blocked, and the front-rear direction The relative movement of B is limited by the friction between the spacer body 18 and the tibia T and the movable block 14. In that sense, the spacer body 18 is fixed to the movable block 14.

  FIG. 3 is a cross-sectional view of the movable block and the femoral attachment part. FIG. 4 is a plan view of the movable block. As shown in FIGS. 3 and 4, the movable block 14 has two holes extending in the vertical direction A and arranged side by side in the front-rear direction B, that is, a front hole 32 and a rear hole 34. The front hole 32 and the rear hole 34 partially overlap each other, and a front slot 36 is formed between them. The rear hole 34 is positioned so as to exceed the rear surface 14b, and a rear slot 38 is formed. The inner diameters of the front hole 32 and the rear hole 34 are equal, and the rear hole 34 receives the cylindrical portion 8a of the hook member 8 so as to be able to be fitted and slidable in the vertical direction A.

  The movable block 14 further includes a drive screw 40 for moving the femoral attachment 2 and the movable block 14 relative to each other, and a support pin 42 (see FIG. 2) that rotatably supports the drive screw 40. ing. The drive screw 40 is slidably and rotatably fitted in the front hole 32, and has an annular recess 40a. Further, the support pin 42 is inserted into a support pin hole 44 provided in the movable block 14 so as to pass through the front hole 32 by shifting the core. The annular recess 40a of the drive screw 40 inserted in the front hole 32 and the support pin 42 inserted in the support pin hole 44 are engaged, and the drive screw 40 is rotatably supported in the front hole 32. Yes.

  The outer diameter of the drive screw 40 and the pitch thereof are respectively equal to the outer diameter of the cylindrical portion 8a and the pitch of the thread 10 formed thereon. Thus, the drive screw 40 and the cylindrical portion 8a are engaged with each other via the front slot 36, and when the drive screw 40 supported by the support pin 42 rotates, the cylindrical portion 8a is in relation to the drive screw 40. It is configured to move in the vertical direction A. The drive screw has a hexagon hole 40b for receiving a hexagon wrench that rotates the drive screw.

  The movable block 14 is further provided with a reference guide hole 46 for forming an installation reference hole common to artificial knee joints of different sizes in the distal end face Fb1 of the femur F, and a thread for attaching various optional jigs. Holes 48 are provided. Three reference guide holes 46 are provided on the left and right. The plate member 6 is configured not to be disposed on the rear side of the reference guide hole 46.

  As shown in FIGS. 3 and 5, the plate member 6 includes a contact protrusion that extends rearward from the first contact surface 6 a and contacts the femur F between the two posterior condyles Fc of the femur F. 51, pushing projections 52 and 53 extending rearward from the first contact surface 6a and pushed into the distal end surface Fb1 of the femur F, and a long hole 54 to which the hook member 8 is detachably attached. ing. The contact protrusion 51 has an upper surface 51a that is curved so as to be positioned between the posterior condyles Fc of the femur F, and a flat lower surface 51b. Preferably, a through hole 51c (see FIG. 3) for inserting a pin for fixing the contact protrusion 51 to the femur F is provided in an oblique direction. The pushing protrusions 52 provided on both sides so as to be located at the anterior condyle Fd of the femur F have an elongated pin shape so as to be inserted into the distal end face Fb of the femur F. The pushing protrusion 53 provided at the center in the left-right direction C of the distal end face Fb of the femur F has a vertically long plate shape. The pushing protrusions 52 and 53 do not reach the medullary cavity of the femur.

  As shown in FIG. 3, the hook member 8 has a connecting portion 56 that extends rearward from the cylindrical portion 8 a beyond the rear slot 38 (see FIG. 4). The connecting portion 56 has a cylindrical shape that extends in the front-rear direction B. The connecting shaft portion 56a and a drop prevention portion 56b extending upward from the connecting shaft portion 56a are provided. The long hole 54 of the plate member 6 is elongated in the vertical direction A so as to receive the connecting portion 56, and has an upper end portion 54a that forms a part of the cylindrical surface. Further, a step portion 6 c is provided on the first contact surface 6 a of the plate member 6 so that the drop prevention portion 56 does not protrude rearward from the first contact surface 6 a of the plate member 6. When the hook member 8 attached to the movable block 14 is attached to the plate member 6, the rear surface 14b of the movable block 14 comes into contact with the second contact surface 6b of the plate member 6 and the hook member 8 is prevented from coming off 56b. The plate member 6 and the hook member 8 are configured such that the plate member 6 abuts on the step portion 6 c of the plate member 6. Further, the connecting shaft portion 56a is rotatable in contact with the upper end portion 54a of the long hole 54, and thus the hook member 8 and the movable block 14 (the jig body 4) rotate around the connecting shaft portion 56a. It is configured to be possible. The long hole 54 is preferably arranged in the plate member 6 so that the position of the connecting shaft portion that is in contact with the upper end portion 54a is the position of the medullary cavity of the femur F.

  As shown in FIG. 6, there are a plurality of types of option jigs 60 attached to the movable block 4, for example, a sizing blade 62, a sizing stylus 64, and a sizing block 66. The sizing blade 62 and the sizing stylus 64 are attached to the movable block 4 via a guide 68, and the sizing block is directly attached to the movable block 4.

  The guide 68 has a screw portion 68a fastened to the threaded hole 48 of the movable block 4, and a guide shaft portion 68b extending in the vertical direction A on the lateral side of the screw portion 68a.

  The sizing blade 62 includes a cylindrical portion 62a that can be fitted to the guide shaft portion 68b, a blade 62b that extends from the cylindrical portion 62a onto the femur in a bent position, and a knob that extends from the cylindrical portion 62a to the opposite side of the blade 62b. It has a portion 62c. A plurality of sizing blades are prepared, and the distances from the lower end of the cylindrical portion 62a to the blades 62b are different. That is, when the plurality of sizing blades 62 are attached to the guide shaft portion 68b, the heights of the blades 62b with respect to the movable block 4 are different from each other.

  The sizing stylus 64 has a double cylinder structure, and the inner cylinder 64b can slide in the vertical direction with respect to the outer cylinder 64a. A stylus 64c is attached to the inner cylinder 64b, and a scale 64d is provided on the outer cylinder 64a to indicate the height of the inner cylinder 64b relative thereto. The inner cylinder 64b also has a mounting hole (not shown) that can be fitted to the guide shaft portion 68b.

  The sizing block 66 has a threaded portion 66a fastened to the threaded hole 48 of the movable block 4, and a plurality of slots 66b provided in accordance with the size of the artificial knee joint. A sizing filler blade (not shown) is inserted into the slot 66b.

  Next, a method of using the artificial knee joint installation jig according to the present invention will be described.

  First, the hook member 8 and the movable block 14 of the femur attachment part 2 are assembled. Specifically, the drive screw 40 is inserted into the front hole 32, the support pin 42 is inserted into the support pin hole 44 and the annular recess 40 a of the drive screw 40, and the drive screw 40 is rotatably supported in the front hole 32. . Next, when the cylindrical portion 8a of the hook member 8 is inserted into the rear hole 34 and the thread 10 of the cylindrical portion 8a is engaged with the drive screw 40, the drive screw 40 is rotated by a hexagon wrench or the like to The member 8 and the movable block 14 are relatively moved in the vertical direction.

  The plate member 6 of the femoral attachment portion 2 is attached to the distal end face Fb1 of the femur F with the knee bent at 90 degrees. Specifically, an attachment tool 70 shown in FIG. 7 is used. The attachment tool 70 includes a clamp portion 70a capable of gripping the plate member 6, a rigid shaft 70b extending forward from the clamp portion 70a, and a plate-like portion 70c attached to the rear end of the shaft 70b. When the plate member 6 is gripped by the clamp part 70a and the contact protrusion 51 of the plate member 6 is positioned between the posterior condyles Fc of the femur F, the plate-like part 70c is struck backward with a hammer or the like. Thus, the pushing protrusions 52 and 53 of the plate member 6 are pushed into the distal end face Fb1 of the femur F. If necessary, a fixing pin is inserted into the through hole 51 c of the plate member 6.

  Next, by attaching the connecting portion 56 of the hook member 8 to the long hole 54 of the plate member 6, the rear surface 14 b of the movable block 14 is brought into contact with the second contact surface 6 b of the plate member 6. Next, the spacer body 18 and the auxiliary spacer 20 are combined so as to have the same thickness as the predetermined gap between the femur F and the tibia T measured when the knee is in the extended position, and the spacer 12 (18, 20), and this spacer 12 is inserted between the movable block 14 and the proximal end face Tb of the tibia T. The auxiliary spacer 20 that is not used is rotated around the pin 20 a and is separated from the spacer body 18. When inserting the spacer 12, the pin 28 of the spacer 12 and the insertion hole 30 of the movable block 14 are aligned, and the pin 28 is inserted into the insertion hole 30 to connect and fix the movable block 14 and the spacer 12. . Further, the handle 16 is attached to the connecting portion 24 of the spacer 12.

  Next, the drive screw 40 is rotated with a hexagon wrench or the like, and the movable block 14 is lowered with respect to the femoral attachment part 2, that is, the distance between the femur F and the tibia T is widened, and the tension state of the ligament in the bending position is increased. Match with the tension state of the ligament in the extended position. A method for confirming whether the tension state of the ligament in the bending position matches the tension state of the ligament in the extension position is a method of rotating the drive screw 40 until the torque of the hexagon wrench reaches a predetermined value, and There is a method of checking the stability or rattling of the jig body 4 attached between the femur F and the tibia T by holding and shaking the handle 16 attached to the spacer 12 by hand. The latter method is a method that depends on the experience of the operator, but depending on the operator, is one of the very effective methods. In the conventional jig, the jig body can be rotated around the intramedullary rod according to the tension state of the ligament, whereas in the jig 1 of this embodiment, the jig body 4 according to the tension state of the ligament. Can be rotated around the connecting shaft portion 54 a of the connecting portion 54 of the hook member 8.

  When the desired tension state of the ligament is obtained, a drill is inserted into the middle hole of the reference guide hole 46 provided on each of the left and right of the movable block 14, and the reference hole provided in the distal end face Fb1 of the femur F is inserted. Form. When re-opening the installation reference hole, another reference guide hole 46 may be used.

  Next, the size of the artificial knee joint is determined.

  When the sizing blade 62 is used, the guide 68 is attached to the movable block 4 using the screw portion 68a. The cylindrical portion 62 a of the sizing blade 62 is inserted into the guide shaft portion 68 b of the guide 68. Using the knob portion 62c, the sizing blade 62 is rotated around the guide shaft portion 68b, and the sizing blade 62 having a size such that the blade 62b touches the femur is selected. The size of the artificial knee joint is determined by the size of the selected sizing blade 62.

  When the sizing stylus 64 is used, the guide 68 is attached to the movable block 4 using the screw portion 68a. The guide shaft of the guide 68 is inserted into a mounting hole (not shown) of the sizing stylus 64. The size of the artificial knee joint is determined by the size indicated by the scale 64d when the tip of the stylus 64c is placed on the femur.

  When the sizing block 66 is used, the sizing block 66 is attached to the movable block 4 using the screw portion 66a. The size of the knee prosthesis is determined by inserting the filler blade into the slot 66b and inserting the slot 66b so that the filler blade indicates the most suitable femoral position. Thereafter, a blade for cutting bone may be inserted into the slot 66b to form the anterior installation surface Fb2 of the femur F.

  Next, the artificial knee joint installation jig 1 is removed. When the plate member 6 is removed, the plate member 6 is gripped by the clamp portion 70a of the attachment tool 70, and the plate-like portion 70c is struck forward with a hammer or the like, so that the pushing protrusions 52 and 53 of the plate member 6 are removed. The distal end surface Fb1 of the femur F is pulled out.

  Finally, using an installation reference hole formed in the femur F, for example, a bone resection jig is fixed to the distal end surface Fb1 of the femur F to form femoral installation surfaces Fb2 to Fb5.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the invention described in the claims. Needless to say, these are also included within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Jig for artificial knee joint installation 2 Femur attachment part 4 Jig main body 6 Plate member 6a 1st contact surface 6b 2nd contact surface 6c Step part 8 Hook member 12 Spacer 14 Movable block 18 Spacer main body 18b Spacer main body Upper surface 26 Support portion 28 Pin 14a Lower surface 30 of movable block Insertion hole 51 Abutting protrusion 52, 53 Pushing protrusion 54 Long hole 54a Upper end 56a Connecting shaft 70 Option jig A Vertical direction F Femur Fb1 Distal of femur End face Fc posterior condyle T femur Tb proximal end face of tibia

Claims (6)

An artificial knee joint placement jig used when the knee is in a flexed position,
A femoral attachment portion attached to the femur;
A jig body that abuts on the proximal end surface of the tibia formed by resection, and
The femoral attachment part and the jig body are movable relative to each other in a direction perpendicular to the proximal end surface of the tibia in order to generate a predetermined tension state in the ligament that connects the tibia and the femur, and at any arbitrary relative position. Can be locked together with each other,
The femoral attachment portion includes a plate member attached to a distal end surface of the femur formed by resection, and the plate member includes a first abutting surface that abuts on the distal end surface of the femur; and a second contact surface of said first abutment surface and parallel to the opposite side, the jig body, and abuts against the second abutment surface,
The plate member extends rearward from the first abutment surface and abutment protrusions that abut against the femur between the two posterior condyles of the femur, and extend rearward from the first abutment surface. and knee joint installation jig characterized by have a push protrusion pushed to the distal end surface of the femur. The femoral attachment portion further includes a hook member that is detachably connected to the plate member, and the jig body is relatively movable in a direction perpendicular to the proximal end surface of the tibia and at an arbitrary relative position. coupled to lockably said hook member, knee joint installation jig according to claim 1. The hook member has a connecting shaft portion extending in the front-rear direction, the plate member has a long hole for receiving the connecting shaft portion, and the hook member has the connecting shaft portion at an upper end portion of the long hole. The artificial knee joint installation jig according to claim 2 , wherein the jig can be rotated around the connecting shaft portion in a contact state. The jig body includes a spacer disposed on a proximal end surface of the tibia, and a movable block that is detachably connected to the spacer and abuts against a second abutment surface of the plate member,
Claim 1-3, wherein the femoral attachment part and said movable block, characterized in lockably be connected to each other at the proximal end face and relatively movable and any relative position in the direction of the vertical tibia The jig for installing an artificial knee joint according to any one of the above. The spacer includes a spacer main body including an upper surface that contacts the movable block, a support portion extending upward from the spacer main body, and a pin extending in the front-rear direction in parallel to the upper surface from the support portion, and is movable. The block includes a lower surface contacting the upper surface of the spacer body, and an insertion hole into which the pin is inserted in a fitted state in a state where the lower surface and the upper surface of the spacer body are in contact with each other. The artificial knee joint installation jig according to claim 4 . The artificial knee joint installation jig according to claim 4 or 5 , wherein an optional jig for determining a size of a femoral component is attached to the movable block.

Images