Experimental studies on treatment of femoral neckf racture by unproved internal fixation

Abstract

Objective To observe the therapeutic effect of treating femoral neck fracture after improved the fixation methods. Methods The bilateral femoral neck fractures model of 18 goats were resulted by operation. The experimental side was fixed using a modified method, and the control side was fixed using the traditional internal fixation techniques. The three-phase radionuclide bone imaging examination was performed 5 times in the pre- and 4,6,8,12 weeks after operation. The femoral head and neck of the goats which were killed in the 4,8,12 weeks after operation were observated by histology. And the treatment effect of femoral neck fractures with modified fixation was evaluated through X-ray examination. Results(1) Blood flow and pool curve showed the blood flow in the artery and the vein of the experimental side was better than that of the control side. Radionuclide bone imaging appear the femoral head blood flow and me-tabolization rate of the experimental side was higher than that of the control side. In the 4th,6thweek after the operation,the bone tissue repaired process was quickly in the experimental side. (2) Histology observation results show that the vascular remodeling and woven bone formation in the experiment side was more rapid than thatof the control side. The clearance of necrosis bone chips in the experiment sidewas accelerated. Conclusion The modified fixation method which in the basis of increasing the stability reduced the intramedullary pressure of femoral neck and protected the residual blood supply, which was conducive to fracture healing, the early reconstruction of femoral head blood supply and promoting bone tissue repair. Key words: Femoral neck fracture; Healing; Femoral head necrosis; Internal fixation; Improvement