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Table 1 Summary of six groups of mechanical tests performed for specific purposes

From: Compression-rate-dependent nonlinear mechanics of normal and impaired porcine knee joints

Tests

Intact

Dehydration

Meniscectomy

Purpose of Tests

(1) Pilot study

(2) Rate dependence

(3) Altered test sequence

(4) Static response

(5) Fluid pressure support

(6) Load support of menisci

Applied peak force/displacement

800 μm

1200 μm

1200 μm

1200 μm

1200 μm

800 μm

500 N

Rates in loading phase

10, 50, 100, 500, 1000, 2000 μm/s

10, 100, 1000, 2000, 5000 μm/s

10, 100, 1000, 2000 μm/s

10, 100, 1000, 2000 μm/s

< 10 μm/s

10, 100, 1000, 2000 μm/s

10, 100, 1000 μm/s

10, 100, 1000 μm/s

25 N/s

Minutes for relaxation/creep phase

20

0 (no relaxation)

35 (3 joints); 0 (2 joints)

0

30–45

0

30–60

30–60 (3 joints); 0 (3 joints)

30–60

Joint angle

~40°

~40°

~40°

~40°

~40°

~40°

~40°

30°

30°

Number of joints

11

2

5

5

7

3

2

6

4

  1. The total number of joints was 45. The tests of dehydrated and meniscectomized joints were performed after the mechanical tests of the corresponding intact joints