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Table 1 Fatigue mechanics test results of the four groups (mean ± SD)

From: Inferomedial cortical bone contact and fixation with calcar screws on the dynamic and static mechanical stability of proximal humerus fractures

Type

Cortex contact + screw fixation

Cortex contact

Screw fixation

Control

P

Humerus height, H (mm)

285 ± 3

282 ± 4

286 ± 4

284 ± 2

1

Head and neck, φ (mm)

53.0 ± 0.2

53.0 ± 0.3

53.0 ± 0.4

53.0 ± 0.2

1

Load, P (N)

500

500

500

500

1

Frequency (Hz)

10

10

10

10

1

Cycles (N)

6682 ± 401

4338 ± 263

3801 ± 230

2402 ± 172

< 0.01

Destruction morphology

Fracture line rupture

Re-fracture

Slight bending of calcar screw

Severe rupture and break

N/A