(1) Objective: Discussion calcaneum bone fracture multi - layered screw CT performance and clinical value.

(2) Method: Analyzing 30 example calcaneum bone fracture screw CT three dimensional reconstruction performance, the CT type, according to type instruction clinical choice suitable treatment plan.

(3) Objective To determine the calcaneum bone density of pregnant women's in meta late-phase with ultrasonic bone density apparatus.

(4) Method: And so on carries on the analysis using the CUBA dry type supersonic calcaneum bone density analyzer to the bone density and the proliferation situation.

(5) Methods 280 cases gravidas in different gestation were determined in calcaneum bone density by using the apparatus. 30 cases normal healthy non-pregnant women were selected as the control group.