A biomechanics study of A-P Gamma nail

doi:10.3969/j.issn.1001-9448.2001.05.003

Abstract：Objective　To study the complications and cuases of Gamma nail for the treatment of peritrochanteric fracture of femur by biomechanics test.Methods　16 fresh femoral specimens were divided into two groups, each consisting of eight specimens. One group was as control, another was as A-P Gamma nail. Evans typy Ⅰ intertrochanteric fracture were produced and fixed with A-P Gamma nial. In the standing position, press test were carried out on MST tested instrument for to compare the biomechanical property of A-P Gamma nail with the control.Results　 When press was 300N, press strength of control was (1 568.06±365.81) N/mm, was better than that of Gamma nail, which was (224.11±66.45) N/mm; When torsion angle was 5°, torsion strength of control was (1.141±0.191) Nm/du, was better than that of Gamma nail, which was (0.114±0.065) Nm/du. Both press and torsion property were significantly different between two kinds of nail. Conclusion　Control is better than that of A-P Gamma nail in both press and torsion property. It may be the main cause that A-P Gamma nail possesses unstability for the treatment of peritrochanteric fracture of femur.