Abstract:

BACKGROUND: Development of computer-aided design (CAD)-rapid prototyping implements planar image to three-dimensional solid digitization, thus, provides guidance for disease diagnosis, focus location, and operation project confirmation, which significantly enhance the security and quality of operation.
OBJECTIVE: To evaluate the therapeutic effect of CAD-rapid prototyping on treating femoral intertrochanteric fracture.
METHODS: A total of 30 cases of intertrochanteric fracture, aged 18-55 years, were selected from Department of Orthopaedics, General Hospital of Guangzhou Command. All cases were randomly divided into the routine operation and CAD groups. Traction on tibial tubercle was performed in the routine group; in the CAD group, exception of traction on tibial tubercle, CT data were extracted, intertrochanteric fracture mode was constructed by CAD, operation reposition on femoral intertrochanteric fracture was simulated, the module match with Greater trochanter of femur, as well as the screw patch was designed. Operation duration and bleeding amount were recorded in the operation. The therapeutic effect was evaluated by using Harris scores at 1 year follow-up.
RESULTS AND CONCLUSION: Femoral intertrochanteric fracture 1:1 model and screw implanting platen could guide the operation accurately, which elevated operating security. Compared to the routine group, CAD decreased operation duration and bleeding amount, with excellent reposition. Harris scores for hip joint showed that the patients recovered well after operation. There was no deformity of coxa vara or shortened limb. All patients achieved the anticipation of clinic purpose. CAD-rapid prototyping overcome the disadvantages, such as inaccurately, great trauma, and repeated radiation exposure of routine operation, which is more safety to patients and doctors.