SU1560182A1 - Knee joint endoprosthesis - Google Patents

Abstract

This invention relates to the field of medicine, in particular to knee joint endoprostheses. The purpose of the invention is to increase the reliability of fastening by ensuring stability of fixation. The knee joint endoprosthesis contains a plate 1 in the form of a half disk with a spherical working surface and a leg 3 in the form of a ball. In the front side of the plate, an inlet channel is created, which passes into a row of through, radially located in the lower part of the leg of the endoprosthesis, channels for cement injection. Over the entire outer surface of the stem in contact with the bone, recesses for bone sprouting are made, and on the lower surface of the plate a number of spikes 7 are created, which are inserted into the created bed of the articular part of the bone. 4 il.

Description

1

This invention relates to medicine, in particular to orthopedics and traumatology, in particular to knee joint endoprostheses.

The purpose of the invention is to increase the reliability of attachment of the endoprosthesis by ensuring stability of fixation.

FIG. Figure 1 shows schematically the endoprosthesis, incision (straight); in fig. 2 - the same, side view; in fig. 3 - endoprosthesis, general view; in fig. 4 - mounting the endoprosthesis in the bone.

The endoprosthesis contains a plate 1 in the form of a half disk (Fig. 1) with a spherical working surface 2. The leg 3 of the endoprosthesis is made in the form of a ball. In the front side of the plate 1, an inlet channel 4 is created, passing into a series of through, radially arranged channels 5 in the lower part of the leg 3. Notches 6 are made on the outer surface of the leg 3 in contact with the bone, and a recess is created on the lower surface of the plate 1 d thorns 7. The endoprosthesis is installed in channel 8.

The endoprosthesis is used as follows.

Parapatelous incision open the articular bag. Patella move respectively medially or laterally. The damaged part of the articular cartilage of the silk of the tibia is removed with a chisel. The cut out composite cartilage and the underlying bone tissue are removed. In the center of the created bone bed, using a drill, a channel 8 is made, 2-3 cm deep and in diameter, corresponding to leg 3 of the endoprosthesis into which the endoprosthesis is inserted. Through the opening of the inlet channel 4, cement is injected, which, passing through the through radial channels 5, fills the free part of the channel (Fig. 4) and securely fixes the endoprosthesis for the coming years. The wound is sutured in layers. In subsequent years, in the grooves 6 (Fig. 3) bone tissue grows. In addition, the shape of the legs in the form of a ball creates a cavity between the ball and the plate 1,

which is also filled with bone tissue that grows and between the spikes 7 (Fig. 1), which also fix the endoprosthesis in the coming years after surgery. Bone germination ensures reliable fixation of the endoprosthesis for the next period of the patient's life.

Claims (1)

Invention Formula Knee joint endoprosthesis, containing a plate with a spherical working surface and a leg, characterized in that, in order to increase the reliability of attachment by ensuring stability of fixation, the plate in it is made in the form of a half disc, and the leg is in the shape of a ball, and in the side plates made an inlet channel, passing into a row of end-to-prosthesis channels for cement injection radially located in the lower part of the leg of the endoprosthesis, with recesses for bone germination on the entire outer surface g of the leg, and overhnosti plate arranged spikes. FIG. 2 FIG A