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Table 2 Comparison of mechanical testing results with FDA mechanical testing data bank

From: Mechanical performance of porous biomimetic intervertebral body fusion devices: an in vitro biomechanical study

 

Test

Test parameter

5th

percentile

25th percentile

50th percentile

75th percentile

95th percentile

Present study

Mean ± S.D

Static (ASTM F2077)

Axial compression

Stiffness

(N/mm)

5097

7984

10,108

13,300

19,203

26,244.8 ± 1154.0

  

Yield strength

(N)

5450

8379

10,117

12,131

15,256

 
  

Ultimate strength

(N)

6236

8935

10,800

14,728

32,863

26,322.1 ± 1848.5

 

Compression—shear

Stiffness

(N/mm)

1492

2927

4347

6140

10,538

9514.0 ± 307.6

  

Yield strength

(N)

1464

2447

3680

5265

6685

7230.8 ± 332.5

  

Ultimate strength

(N)

1515

2861

4626

6868

11,001

7334.8 ± 379.5

 

Torsion

Torsional stiffness

(N m/degree)

0.3

0.7

1

1.9

4.7

5.5 ± 0.3

  

Yield moment

(N m)

3.1

6.1

8.6

12

18.8

 
  

Ultimate moment

(N m)

3.3

7.6

9.9

13.8

25.3

39.7 ± 1.5

Dynamic (ASTM F2077)

Axial compression

Runout load

(N)

1500

2000

2600

3500

5760

2000–2400

 

Compression—shear

Runout load

(N)

679

1000

1400

1875

2450

1400–1875

 

Torsion

Runout torque

(N m)

 ± 1.0

 ± 1.5

 ± 1.5

 ± 2.0

 ± 3.0

 > 2

Subsidence (ASTM F2267)

 

Kp, Block stiffness

(N/mm)

257

324

424

522

791

436.3 ± 21.0

  1. The FDA Mechanical testing results was cited from Peck JH et al. [3]