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

Table 1

The results of compressive strength in two groups.

Pauwels angle	50	60	70
Compressive strength (N)
Group A (OCCS)
Mean	177.58	137.54	109.03
Minimum	135.00	114.43	91.14
Maximum	195.30	193.84	120.35
SD	25.74	32.57	7.89
Group B (HCCS)
Mean	214.08	135.96	128.58
Minimum	192.09	77.89	113.40
Maximum	240.47	199.69	153.21
SD	18.62	43.52	12.24
	0.133	0.721	0.019