Biomechanical test of improved retrograde screwed nail / 中国组织工程研究

ABSTRACT

BACKGROUND:At present, humeral fractures can be mainly treated by antegrade screwed intramedul ary nail and traditional interlocking intramedul ary nail, but above methods easily induce rotator cuff injury. Results of relevant study revealed that retrograde intramedul ary nailing can solve the above problems. OBJECTIVE:To analyze biomechanical test results of retrograde improved screwed nail and to provide a basis for the further clinical use. METHODS:(1) According to the anatomical characteristics of the human humerus, specimens of humerus were subjected to biomechanical test. (2) A total of 80 cases of humeral fractures were selected from the Orthopeadic Surgery of Xi’an Red Cross Hospital Affiliated to Xi’an Jiaotong University School of Medicine from December 2013 to January 2015. Patients were randomly divided into improved nail group and prototype nail group (n=40), which were given improved nail and prototype nail, respectively. RESULTS AND CONCLUSION:(1) Anti-axial compression, anti-tension, anti-torsion, and anti-bending functions were significantly better in the improved screwed nail than in the prototype nail (P<0.05). (2) The excel ent and good rate of clinical curative effects was significantly higher in the improved nail group than in the prototype nail group. No infection, metal fracture or internal fixation loosening occurred in al patients of the two groups. These findings suggest that compared with traditional screwed nail, retrograde improved screwed nail had more advantages, more reasonable biomechanical design, more simple operation, and lower incidence of complications, so it is fit for clinical application.