Chinese Journal of Tissue Engineering Research ›› 2016, Vol. 20 ›› Issue (26): 3811-3816.doi: 10.3969/j.issn.2095-4344.2016.26.002

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Total hip arthroplasty for determining the position of the prosthesis and the biomechanical properties

Qi Da-chun1, An Xin-rong2   

  1. 1Department of Bone and Joint Surgery, 2Department of Endocrinology, Affiliated Hospital of Binzhou Medical University, Binzhou 256603, Shandong Province, China
  • Revised:2016-04-28 Online:2016-06-24 Published:2016-06-24
  • About author:Qi Da-chun, Master, Associate chief physician, Department of Bone and Joint Surgery, Affiliated Hospital of Binzhou Medical University, Binzhou 256603, Shandong Province, China

Abstract:

BACKGROUND: During total hip arthroplasty, it is difficult to accurately determine the exact orientation of the pelvis. Pelvic position is prone to change during treatment. After prosthesis implantation, angle deviation easily occurs. The surgeon is difficult to accurately determine the position and orientation of the prosthesis.

OBJECTIVE: To investigate the effects of prosthesis position during total hip arthroplasty by using three-dimensional computer-aided technique, and to analyze the biomechanical properties of the prosthesis in total hip arthroplasty.
METHODS: Data of ten patients undergoing total hip arthroplasty in the Affiliated Hospital of Binzhou Medical University from January to November 2015 were analyzed. SIEMENS/DEFINITION dual source CT was used to scan the skeleton of patients. CT data were collected as a basis for data in modeling. Slice thickness was 0.732 mm; resolution of the inner surface was 512 × 512. CT data were imported in three-dimensional reconstruction software of a computer. The models of femur and pelvis were established. According to the type of fracture, false models of total hip arthroplasty were established. Simultaneously, biomechanical prosthesis models were established. We determined research methods of prosthesis position by computer-aided techniques and analyzed biomechanical properties in total hip arthroplasty. 
RESULTS AND CONCLUSION: (1) The use of computer-aided technology could clearly show the defect site. After determining the defect position using computer-aided techniques, prosthesis implantation and repair effect could be simulated in the software. (2) The computer-aided through technology could accurately determine the vertical weight of the human. The acetabular center of rotation was used as the origin. A vertical parallel line was generated. The sagittal and coronal planes of the prosthesis could be set in new coordinates. (3) With the aid of computer, total hip prosthesis models were constrained and loaded, which lay the foundation for the operation through the model development. (4) The 10 patients achieved successful surgery. The position of prosthesis was correct in nine patients, with a success rate of 90%. Patients were followed up for 3 months. The patients did not have other complications. (5) These results suggest that computer-aided technology can do three-dimensional construction and analysis of the prosthesis, and can construct the position of the prosthesis during total hip arthroplasty according to three-dimensional reconstruction of the digitized pelvis model so as to achieve precise positioning of surface hip prostheses, which can prevent excessive wear of the joint, make pelvis closer to the physiological state of the mechanical distribution, and achieve the desired effect.

中国组织工程研究杂志出版内容重点:人工关节;骨植入物;脊柱骨折;内固定;数字化骨科;组织工程

Key words: Arthroplasty, Replacement, Hip, Prosthesis Implantation, Biomechanics, Tissue Engineering

CLC Number: