Abstract:

BACKGROUND: Traction bed C-arm X-ray machine is used for closed reduction and internal fixation to treat femoral neck fracture has some errors.
OBJECTIVE: To perspectively analyze the accuracy of closed reduction for femoral neck fractures by assisted C-arm X-ray machine.
METHODS: Complete reduction of artificial femoral neck fractures was realized under direct vision and then fixed by kirschner pins which were knocked in at both fractured ends respectively on lateral femoral neck to be used as metal marker. Femoral neck specimens and C-arm X-ray machine were not removed and then the femoral neck specimens revolved 15° clockwise and 30° anticlockwise respectively. Anterior-posterior of the standard femoral neck was examined by C-arm X-ray machine, then corresponding imaging was collected.
RESULTS AND CONCLUSION: There was no significant difference of the displacement in the both ends of the subcapital femoral neck fractures (around 1 mm both) when the necks were located at the position of 15°, 30° clockwise and anticlockwise respectively. There was significant difference of the displacement in the both ends of the subcapital femoral neck fractures (around 2 mm both) when the necks were located at the position of 30°, 30° clockwise and anticlockwise respectively. It is shown that C-arm X-ray machine is used to observe the subcapital femoral neck fractures and can meet the reduction requirement of Garden scores, but the femur head rotation cannot be identified. As a result, displaced femoral neck fractures necessitate open reduction.