四象限定位法置钉一次成功率达86.9%，同其他4种定位法比较有显著性差异（P<0·01）。
The successful rate of placement nails one time by the location method of four quadrants technique was 86.9 % , which was significantly different compared with the other 4 location methods ( P < 0.01 ) .
四象限定位法