Abstract:

BACKGROUND: Acetabular bone defects in hip arthroplasty are often difficult to locate and quantify, and therefore the use of computer-aided design and computer-aided processing technology for preoperative preparation can reduce the difficulty and risk of acetabular reconstruction.
OBJECTIVE: To investigate the application and significance of Mimics software for individual revision of total hip prothesis. 
METHODS: The hip CT scan image data of patients with total hip arthroplasty was input into Mimics software to reconstruct the three-dimensional hip joint model. The anteversion, valgus angle, neckshaft angle, femoral head diameter, acetabular wall thickness/diameter and loosening broken case of the hip prosthesis were measured; the range of acetabular bone defect was located and quantified. Meanwhile, through the simulation of the renovation, the range of bone and the implanted total hip prosthesis size were designed.
RESULTS AND CONCLUSION: Mimics three-dimensional window was used to precisey locate the broken prosthesis; the maximum longitudinal diameter of the debris was forecasted to 33.68 mm, the distance from the debris to the femoral head prosthesis was 48.93 mm, the distance from the debris to the acetabular component was 20.14 mm. The average threshold of acetabular selected 130.47 mm2 viewable area was 339.98, the average threshold of 130.47 mm2 viewable area in bone defect area was -481.25, and the defect area was 21.41 mm×21.38 mm. The bone defects were evaluated according to three-dimensional model assessment and classified: American Academy of Orthopaedic Surgeons classification type ⅠB, Gross classification type ⅡA, Engh classification type Ⅰ. Results confirm that Mimics software can optimize solutions and ways of hip arthroplasty and reduce complications and the risk of surgery.