Ordinary Cannulated Compression Screws or Headless Cannulated Compression Screws? A Synthetic Bone Biomechanical Research in the Internal Fixation of Vertical Femoral Neck Fracture

Table 2

The results of maximum load to failure in two groups.

Pauwels angle	50	60	70
Maximum failure load (N)
Group A (OCCS)
Mean	691.56	437.05	312.06
Minimum	567.81	391.27	246.02
Maximum	750.39	530.00	467.81
SD	72.02	55.97	89.64
Group B (HCCS)
Mean	1001.80	660.05	468.83
Minimum	809.77	508.98	324.34
Maximum	1202.56	772.21	521.18
SD	151.88	104.16	82.02
	0.022	0.026	0.018