JPH0732781B2 - Instruments for total knee arthroplasty - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention provides accurate and accurate replacement of rheumatism, deformable knee joint, or the like, or a knee joint that has been highly deformed or destroyed due to an accident disaster with an artificial knee joint. The present invention relates to a device for total knee arthroplasty used to perform an appropriate osteotomy.

[Conventional technology]

In the conventional knee arthroplasty instruments, when performing bone cutting, for example, as shown in FIG. 5, separate instruments K ₁ and K are attached to the femur F and the tibia T, respectively.
₂ is used to cut off the lesion, or as shown in FIG. 6, only the tibia T or femur F side is cut with the instruments K ₃ and K _{4 first} , and the opposite side is cut. An instrument was used in which the bone cutting position was used as a reference for excision.

[Problems to be solved by the invention]

However, using conventional instruments, it was not possible to cut all the lesions or even healthy bones. In other femurs, tibias, and systems that use separate instruments, the thickness of the artificial joint cannot be taken into consideration.Therefore, when this is replaced, there is a big problem that the sliding contact is too strong or too weak. It was

[Means for solving problems]

In order to solve the above problems, a part of a conventional instrument has a slit for osteotomy in which the thickness of the artificial knee joint component (indicated by l in FIG. 4) is set, and the position is adjusted according to an example. It is characterized by combining variable mechanisms.

[Action]

By having a bone-cutting slit that sets the thickness of the artificial knee joint and being movable, setting it at an appropriate position while observing the balance of the symptoms of the femur and tibia, and cutting the bone through the bone saw, It is possible to perform an appropriate and appropriate amount of osteotomy.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 and FIG. 2 are perspective views of a front surface and a rear surface of an artificial knee joint replacement instrument 1 according to the present invention, respectively.
Has a plate-like portion 2 which is inserted between the joints of the femur F and the tibia T. The plate-like portion 2 is movable by being divided into upper and lower parts by adjusting the tension of the ligament and adjusting the screw a to correct the alignment. It is free. As shown in FIG. 3, when the plate-shaped portion 2 is inserted between the joints of the femur F and the tibia T, an osteotomy slit 3 movable in front of the bone is attached to the base material 4 connected to the plate-shaped portion 2. Has been. This attachment may be performed through a member such as the member 5 or may be directly attached using the base material 4. This bone cutting slit 3 can be fixed at an appropriate position with a screw or the like.
As shown in FIG. 4, the interval of is adjusted to the total thickness l of the femoral-side lower end portion A and the tibial-side upper end portion B of the artificial knee joint component C. It may be provided at several places, or the slits may have variable intervals, and bone cutting is performed by passing the bone saw S through the slits.

Further, it is desirable that an ankle fixing jig 6 is attached to the base material 4 for alignment adjustment.

By providing a movable slit that sets the thickness of the artificial knee joint component in this way, when performing artificial knee joint surgery, set the appropriate osteotomy position while considering the osteotomy balance of the femur and tibia according to the individual case. In addition, bone cutting is possible.

〔The invention's effect〕

As described above, by providing a mechanism in which the osteotomy slit that sets the thickness of the component of the artificial knee joint is movable, osteotomy according to each case can be performed while observing the balance between the femur and tibia. This makes it possible to perform accurate and appropriate artificial knee joint replacement weight, and the sliding on the joint surface is good and there is no discomfort, which is a major contribution to human welfare.

[Brief description of drawings]

1 and 2 are perspective views of a front surface and a rear surface of an artificial knee joint replacement instrument according to the present invention, respectively. FIG. 3 is a perspective view showing a state in which the artificial knee joint replacement instrument according to the present invention is actually mounted. FIG. 4 shows a side view of a knee prosthesis component. 5 (a) and (b) are front views showing the attachment state of the device for performing osteotomy by applying the conventional device to the femur and tibia separately, and FIG. 6 (a) and (b) are the tibia. FIG. 3 is a three-dimensional perspective view for explaining a mounted state of an instrument for cutting bones first and cutting the femur after that. 1: Artificial knee replacement device 2: Plate-shaped part 3: Movable slit 4: Base material 5: Member 6: Ankle fixing jig a: Screw F: Femur T: Tibia

Claims (1)

[Claims] 1. An artificial knee joint component is slidably provided with a bone cutting slit in which the thickness amount of the artificial knee joint component is set in order to set an appropriate bone cutting position and an appropriate bone cutting amount according to the case in the artificial knee joint replacement surgery. An instrument for total knee arthroplasty, which is characterized in that