JPS6031705Y2 - acetabular socket of artificial hip joint - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a palatal socket for an artificial hip joint used particularly in orthopedic medicine.

The installation method of the artificial hip joint is as shown in Fig. 1.
The femoral head ball 4 provided at the tip of the femoral stem 3 is inserted into the bone and fixed with the bone cement 2, and the bone cement 7 is inserted into the recess 6 formed in the coxal bone 5, which is a part of the pelvis.
The palatal socket 8 is rotatably fitted into the palatal socket 8 which is fixed to the palatal socket 8.

In this way, the femoral stem 3 and the palatal socket 8, which movably connect the femur 1 and hip bone 5, are fixed to the bone with bone cements 2 and 7, respectively.

Therefore, when such an artificial hip joint is used, the load of the body is applied to the femur 1 through the layers of the bone cements 2 and 7, so the layers of the fixed bone cement 2 and 7 are placed at the positions where the load is applied. Depending on the bone cement 7, the thickness of the bone cement 7 that fixes the palatal socket 3 and the hip bone 5 is uneven, the layers of the bone cement 7 may crack, and the adhesive surface may become damaged. It has been clinically confirmed that delamination of the artificial hip joint occurs, and the strain and eccentric load caused by these causes rattling and loosening of the artificial hip joint, which ultimately leads to destruction and the need for revision surgery. It has become unavoidable.

Therefore, although it is well recognized that it is important to interpose and adhere a layer of bone cement 7 almost uniformly between the palatal socket 8 and hip bone 5 during surgery, Positioning that required intervention was extremely difficult and had to be done by feeling.

In view of the above, this proposal is based on the idea that when fixing the palatal socket to the hip bone during surgery, the gap between the socket and the hip bone is set uniformly, so a bone cement layer is inevitably inserted in the gap for fixation. The present invention aims to provide a palatal socket for an artificial hip joint having a structure that has a substantially uniform thickness, and examples thereof will be described below with reference to the drawings.

If the same parts as the conventional example are given the same symbols, the second
As shown in the side and rear views of the palatal socket 8 in FIG. An annular groove 9 is formed therein, and a vertical groove 10 is formed in the vertical direction perpendicular to the annular groove 9 to prevent rotation and increase stability when bonded.

In this way, the stud 11 can be inserted into and removed from the vertical groove 10 (or annular groove 9) formed on the side of the palatal socket 8 that is fixed to the hip bone 5, as shown in FIG. The palatal socket 8 can be attached freely to the desired location.
The stud 11 protrudes from the surface of the hip bone 5 that is fixed to the hip bone 5, and serves as a spacer.

Therefore, during surgery, the tip of the stud 11 comes into contact with the wall surface of the recessed hole 6 formed in the hip bone 5, so that the gap between the palatal socket 8 and the hip bone 5 is set to be approximately equal. As shown in FIG. 4, the bone cement 2 interposed in the gap is attached to the palatal socket 8 with a nearly uniform adhesive layer.
can be adhered and fixed to the hip bone 5.

The stud 11 to be attached to the palatal socket 8 is removable from the palatal socket 8, and by appropriately selecting and using a long or short stud, the stud 11 can be attached to the concave hole 6 of the hip bone 5. The gap formed between the wall surface of the socket 8 and the palatal socket 8, that is, the thickness of the bone cement 2, can be freely set.

Further, if it is necessary to compensate for the lack of bone mass at the upper edge of the acetabulum, which is often seen in patients with subluxation or high dislocation of the hip joint, a stud 11 with a relatively large volume may be used.

As described above, according to the present invention, a stud is attached to the side of the palatal socket that is bonded to the bone, forming a predetermined gap between the studs and the bone, and forming a layer of approximately uniform thickness of bone cement used for bonding. Therefore, the bone cement layer has excellent mechanical strength and does not crack or peel, which can greatly reduce loosening and breakage of the artificial hip joint due to these problems. Furthermore, regardless of the skill level of the surgeon, it can always be attached reliably, making a great contribution to the field of orthopedic surgery and ultimately to human society.

It should be noted that the present invention is of course applicable not only to the hip joint but also to artificial hip joints attached to other parts that are fixed using bone cement.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a state in which a conventional artificial hip joint is installed, and FIG. FIG. 3 is a partially enlarged view showing a state in which a stud is attached to the palatal socket according to the present invention, and FIG. 4 is a sectional view showing a state in which an artificial hip joint using the palatal socket according to the present invention is installed. 1: Femur, 2, 7: Bone cement, 3: Femoral stem, 5: Hip bone, 6: Recessed hole, 8: Palatal socket, 9: Annular groove, 10: Longitudinal groove, 11: Stud.

Claims (1)

[Scope of utility model registration request] A palatal socket for an artificial hip joint, characterized in that a spacer is detachably provided on the side of the hip bone of the palatal socket, which is attached to the hip bone as an artificial hip joint.