[The effect of V-shaped nitinol alloy implantation on acetabular dysplasia: an experimental study].

OBJECTIVE

To observe the effect of V-shaped nitinol alloy implantation into the acetabular roof of puppies with acetabular dysplasia on acetabular dysplasia.

METHODS

The puppies with acetabular dysplasia were divided randomly into two groups. Osteotomy was begun about 0.5 cm above the acetabulum, using a curved osteotome this cut must proceed between the medial wall of the ilium and medial wall of the acetabulum. The osteotomy does not have to be carried to the triradiate cartilage. When the osteotomy is completed, the superior aspect of the acetabulum can be hinged downward by curved osteotome. The V-shaped nitinol alloy was wedged securely in the osteotomy site. Roentgenogram was made 4 and 12 weeks after operation in all animals.

RESULTS

The inclination of the acetabular roof was redirected and the acetabular index was decreased. Microscopic study showed a marked proliferation of cartilaginous cells of the acetabular cartilage.

CONCLUSION

The V-shaped nitinol alloy implantation into the acetabular roof can correct the sloping acetabular roof, increase the coverage on the femoral head, and improve the growth of the acetabulum.