Introduction Core decompression proves effective in early stage of the ischemic necrosis of femoral head. But the accuracy of the drilling turns out to be a problem, because in conventional procedure the pre-operational radiation image only shows one plane of the ischemic areas. A new method based on the computer-assisted technology and rapid prototyping enhance the accuracy of the drilling in core decompression. Methods The core decompression target at femoral head anterolateral was marked by the glass ion, three positioning Kirschner wires were drilled into the top and the bottom of a large rotor. Then the specimen is scanned by CT, CT format image of specimen was imported into Mimics 10.01, after the three-dimensional reconstruction of the specimen and showing the target, the best core decompression channel was designed. A navigational template for specimen was drew by Pro / E software, and then manufactured by rapid prototyping technology. The individual navigation templates was installed on the positioning needle and the drilling of core decompression guide needle was guided by the guide hole on the templates. The distance between the end point of guide needle and the target was measured. Results The average distance of the error range is 1.92mm. Conclusions Simulation core decompression technology by computer-rapid prototyping is reliable and accurate, providing a new idea and methods for precision decompression.
Key words: Core decompression; 3D reconstruction; the surgery simulation; Mimics software
The core decompression, which was proposed by Ficat and Arlet in 1964, is a conservative treatment for ischemic necrosis of femoral head in early stage. It plays an important role in treating the ischemic necrosis in early stage and postpones the progress of the ischemic necrosis [1, 2]. Since this technique is put forward by Ficat and Arlet, core decompression has been developed from the simple core decompression to the multiple...