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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