Choice of the loading stress during the fracture fixation of humerus using Swain Memory Compression Bone Reduction Apparatus

Jiacan SU; Ruiguan WANG; Chuncai ZHANG; Zhaojun XUE; Jianguo WU; Zuquan DING

ABSTRACT

BACKGROUND:

During the therapy of the fracture of humerus, the main problem is the loading direction and power of the stress.

OBJECTIVE:

To analyze the choice of the different loading manners using Swain Memory Compression Bone Reduction Apparatus so as to provide the clinical evidence for the set position of the internal fixation apparatus, the loading direction and power during the therapy of the fracture of humerus.

DESIGN:

To construct the three-dimensional finite element model of the fracture of humerus with different loading manners.

SETTING:

Department of Orthopaedics of Changhai Hospital of Second Military Medical University of Chinese PLA; College of Life Sciences and Bioengineering of Tongji University,MATERIALS The study was conducted during the period from January 2001 to May 2003 in the Orthopedic Laboratory of Changhai Hospital of Second Military Medical University of Chinese PLA and the laboratory of Life Science and Bioengineering Academy of Tongji University. The samples of the humerus taken from the wet adult cadavers, and the Swain Memory Compression Bone Reduction Apparatuses of the corresponding size were prepared.

METHODS:

The CT scanning was done on the samples of the wet humerus to obtain the cross section image of each layer of the humerus.The images were analyzed by a large-scale finite element analysis software ANSYSS.6 to construct the three-dimensional model of the humerus, Swain Memory Bone Reduction Apparatus and the fixed humerus using Swain Memory Bone Reduction Apparatus.MAIN OUTCOME

MEASURES:

To get the reference values for the clinical therapy through the comparison of the power endurance with different loading manners.

RESULTS:

The three-dimensional model of the fixed humerus using Swain Memory Bone Reduction Apparatus reflects the real anatomical configuration and the biomechanics behavior; meanwhile the status of the power endurance of humerus with different loading manners is also obtained.

CONCLUSION:

The three-dimensional model of the fixed humerus using Swain Memory Bone Reduction Apparatus may provide an accurate model for the basic study of the biomechanics behavior of the normal and fixed humerus after the fracture.