Chinese Journal of Tissue Engineering Research ›› 2013, Vol. 17 ›› Issue (13): 2439-2446.doi: 10.3969/j.issn.2095-4344.2013.13.022

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Biomechanical changes and clinical effect of internal fixator placement for the treatment of distal femoral fractures

Guan Ji-kui1, Guan Yu2, Zhao Li1, Wang Hui1, Kong Li1, Li Jing1, Liu Jian-guo3   

  1. 1Department of Orthopedics, Daqing Oilfield General Hospita, Daqing 163001, Heilongjiang Province, China
    2 Department of Stomatology, Beijing Chaoyang Hospital, Beijing 100020, China
    3 Department of Orthopedics, the First Hospital of Jilin University, Changchun 130021, Jilin Province, China
  • Received:2012-10-10 Revised:2013-01-20 Online:2013-03-26 Published:2013-03-26
  • Contact: Liu Jian-guo, Doctor, Professor, Doctoral supervisor, Chief physician, Department of Orthopedics, the First Hospital of Jilin University, Changchun 130021, Jilin Province, China Jgliu.2005@yahoo.com.cn
  • About author:Guan Ji-kui★, Master, Associate chief physician, Department of Orthopedics, Daqing Oilfield General Hospita, Daqing 163001, Heilongjiang Province, China Guan1858@163.com

Abstract:

BACKGROUND: Placement of internal fixators is one of the preferred methods for the treatment of distal femoral fractures.
OBJECTIVE: To evaluate the biomechanical changes of different internal fixators after distal femoral fracture due to the complexity of the anatomical structure of distal femoral fractures, in order to guide the clinical application.
METHODS: Compressive stiffness and bending strength of less invasive stabilization system steel plate, dynamic condylar screw and retrograde interlocking intramedullary nail internal fixation for the treatment of distal femoral fractures were detected, and the biomechanical changes of the three internal fixations were compared. Patients with distal femoral fractures who were treated with less invasive stabilization system steel plate, dynamic condylar screw and retrograde interlocking intramedullary nail internal fixations were followed-up to identify the clinical effect of three internal fixators and the clinical effects were compared.
RESULTS AND CONCLUSION: Biomechanical testing showed that during the treatment of distal femoral fractures with internal fixators, dynamic condylar screw had higher stress shielding, while the retrograde interlocking intramedullary nail had lower stiffness. Less invasive stabilization system steel plate had a certain degree of deformability which can conduct the stress through bone, and it also had strong rigidity, which can provide better stability for the internal fixation of fracture. The follow-up of the patients with distal femoral fractures showed that less invasive stabilization system steel plate had shorter fracture healing time, lower incidence of complications and higher excellent and good rate of knee joint, which is considered as the best method for the treatment of distal femoral fractures.

Key words: bone and joint implants, academic discussion of bone and joint implants, distal femoral fractures, internal fixation, biomechanics, less invasive stabilization system steel plate, dynamic condylar screw, retrograde interlocking intramedullary nail, knee joint, knee varus, complications

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