Anti-compression and anti-rotation ability of dynamic hip screw-blade fixation for femoral neck fracture
WU Jun1, YANG Chengwei1, ZHU Liulong2, CHEN Liang1
1.Department of Orthopedics, People’s Hospital of Lin’an District Affiliated to Hangzhou Medical College, Hangzhou 311300, China; 2.Department of Orthopedics, the First People’s Hospital of Hangzhou, Hangzhou 310006, China
WU Jun,YANG Chengwei,ZHU Liulong, et al. Anti-compression and anti-rotation ability of dynamic hip screw-blade fixation for femoral neck fracture[J]. JOURNAL OF WEZHOU MEDICAL UNIVERSITY, 2019, 49(8): 603-605，611.
Abstract：Objective: To compare the anti-compression and anti-rotation ability of dynamic hip screw-blade (DHS-B) fixation in the treatment of femoral neck fractures. Methods: 8 femoral neck fracture specimens from 4 adult cadavers were prepared and divided into 2 groups. The observation group was treated with DHS-B fixation, while the control group was treated with 3 cannulated compression screws (CCS) fixation. Axial compression test, horizontal torsion test and axial compression test were adopted to evaluate the anti-compression and anti-rotation ability of the 2 stationary schemes. Results: With 500N axial load, the axial and medial strain of the femoral head in the observation group was significantly lower than those in the control group (P<0.05), there was no significant difference between the 2 groupsin the displacement of the femoral head (P>0.05). With 6 degrees torsion angle, there was no significant difference in torque between the 2 groups (P>0.05). The maximum axis carrying capacity of the observation group was higher than that of the control group (P<0.05). Conclusion: DHS-B has reliable ability of anti-rotation and anti-compression. It is suitable for the treatment of femoral neck fracture.
