期刊：
INTERNATIONAL JOURNAL OF MEDICAL ROBOTICS AND COMPUTER ASSISTED SURGERY,2011年7(4):469-474 ISSN：1478-5951
通讯作者：
Zhang, Yuan Z.
作者机构：
[Liu, Rui; Zhao, Jian M.; Zhang, Yuan Z.; Yang, Yong] Inner Mongolia Med Coll, Affiliated Hosp, Dept Orthopaed, Hohhot, Peoples R China.;[Chen, Bin] Zhejiang Univ, Sch Med, Affiliated Hosp 1, Dept Orthopaed, Hangzhou 310003, Zhejiang, Peoples R China.;[Lu, Sheng] Kunming Gen Hosp, Dept Orthoped, Kunming, Peoples R China.;[Li, Yan B.] NanHua Univ, Dept Anat, Henyang, Peoples R China.;[Pei, Guo X.] Fourth Mil Med Univ, Xijing Hosp, Dept Orthopaed, Xian 710032, Peoples R China.
通讯机构：
[Zhang, Yuan Z.] I;Inner Mongolia Med Coll, Affiliated Hosp, Dept Orthopaed, Hohhot, Peoples R China.
关键词：
computer-assisted surgery planning;development dysplasia of the hip;total hip arthroplasty;navigation template
摘要：
Background The considerable variation in anatomical abnormalities of hip joints associated with different types of developmental dysplasia of hip (DDH) makes reconstruction in total hip arthroplasty (THA) difficult. It is desirable to create patient-specific designs for THA procedures. In the cases of adult single DDH, an accuracy-improved method has been developed for acetabular cup prosthesis implantation of hip arthroplasty. Methods From October 2007 to November 2008, 22 patients with single DDH (according to the Crowe standard, all dysplasia hips were classified as type I) were scanned with spiral CT pre-operatively. These patients scheduled for THA were randomly assigned to undergo either conventional THA (control group, n = 11) or navigation template implantation (NT group, n = 11). In the NT group, three-dimensional (3D) CT pelvis image data were transferred to a computer workstation and 3D models of the hip were reconstructed using the Mimics software. The 3D models were then processed by the Imageware software. In brief, a template that best fitted the location and shape of the acetabular cup was 'reversely' built from the 3D model, the rotation centre of the pathological hip determined by mirroring that of the healthy site, and a guiding hole in the template was then designed. The navigational templates were manufactured using a rapid prototyping machine. These navigation templates guide acetabular component placement. Results Based on the predetermined abduction angle 45 degrees and anteversion angle 18 degrees, after 1 year follow-up, the NT group showed significantly smaller differences (1.6 degrees +/- 0.4 degrees, 1.9 degrees +/- 1.1 degrees) from the predetermined angles than those in the control group (5.8 degrees +/- 2.9 degrees, 3.9 degrees +/- 2.5 degrees) (P < 0.05). Conclusions The template designs facilitated accurate placement of acetabular components in dysplasia of acetabulum. The hip's center of rotation in DDH could be established using computer-aided design, which provides a useful method for the accurate location of prosthesis with a low cost-performance ratio without excessive technical workload on the surgical team. Copyright (C) 2011 John Wiley & Sons, Ltd.
摘要：
<正>Objective To investigate the changing regularity of thoracic pedicle screw channel （PSC） in different transverse screw angle（TSA）.Methods CT scan images of thoracic vertebrae of a healthy adult ware digitally analyzed by Mimics 10.01 software
摘要：
Total hip resurfacing arthroplasty is increasingly being used. One of its goals is to closely mimic the normal anatomy and normal biomechanics of the hip joint. Prosthesis location has a large impact on implant survival and patient function; but in conventional hip resurfacing arthroplasty, precise positioning sometimes cannot be achieved. We describe a novel method for ensuring accurate prosthesis implantation in hip resurfacing arthroplasty by means of 3-dimensional reconstruction and reverse engineering.
作者机构：
[张元智] Department of Orthopedics, Inner Mongolia Medical College, Hohhot 010050, China;[Lu S.; 徐永清; 师继红] Department of Orthopedics, Kunming General Hospital, Chengdu Military Command, Kunming 650032, China;[李严兵] Department of Anatomy, University of South China, Hengyang 421001, China;[冯子良] Center of Disease Control, Chengdu Military Command, Kunming 650032, China
通讯机构：
[Lu, S.] D;Department of Orthopedics, Kunming General Hospital, Chengdu Military Command, China
摘要：
Objective: To provide a new method in the fixation of sacral fracture by means of three-dimensional reconstruction and reverse engineering technique. Methods: Pelvis image data were obtained from three-dimensional CT scan in patients with sacral fracture. The data were transferred into a computer workstation. The three-dimensional models of pelvis were reconstructed using Amira 3.1 software and saved in STL format. Then the three-dimensional fracture models were imported into Imageware 9.0 software. Different situations of reduction (total reduction, half reduction and non-reduction) were simulated using Imageware 9.0 software. The best direction and location of extract iliosacral lag screws were defined using reverse engineering according to these three situations and navigation templates were designed according to the anatomic features of the postero-iliac part and the channel. The exact navigational template was made by rapid prototyping. Drill guides were sterilized and used intraoperatively to assist in surgical navigation and the placement of iliosacral lag screws. Results: Accurate screw placement was confirmed with postoperative X-ray and CT scanning. The navigation template was found to be highly accurate. Conclusion: The navigation template may be a useful method in minimal-invasive fixation of sacroiliac joint fracture.
