| Popis: |
In order to help orthopedists evaluate the morphological characteristics of the acetabulum of patients with osteoarthritis of the hip more efficiently and accurately to identify the type of acetabular deformities which benefits the personalized preoperative planning, a 3-dimensional (3D) acetabular morphologic parameters measurements software dedicated to the hip was developed. The system includes four modules: 1) Identify the anterior pelvic plane (APP) of the pelvis model; 2) Identify the circular rim of the acetabular wall; 3) Automatically measure the 3D morphological parameters of the dysplastic acetabulum; 4) Interactively measure the 3D morphological parameters of the dysplastic acetabulum. The automatic parameter measurement function of this software could fast and accurately measure the 3D morphological parameters of the dysplastic acetabulum. These automatically measured parameters were close to those measured manually with error generally less than 2mm, and their average measurement time was nearly 10 times faster than that using the Mimics 17.0 system. For patients with large osteophyte, the 3D morphological parameters of the dysplastic acetabulum could be efficiently measured using the interactive measurement function of this software with simple operations. This software was used to measure acetabular morphological parameters in 61 patients. Two types of dysplastic acetabula were identified by the thickness of the medial wall on the lower margin of the acetabulum Tb: type I was a thin acetabulum (35 cases, $Tb \leqslant 10.0$ mm) and type II was a thick acetabulum (26 cases, $Tb > 10.0$ mm). According to the result of the acetabular morphological characteristic analysis, it can be found that the thickness of the medial wall is an important morphological characteristic for the THA preoperative surgical planning, and the thickened medial wall could be a misleading factor for the suboptimal placement of the cup |
