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Table 1 Summary of the results from all quasi-static tests

From: A modified and enhanced test setup for biomechanical investigations of the hindfoot, for example in tibiotalocalcaneal arthrodesis

Torsion
Instron machine Optotrak® system
ROM [°] NZ [°] TIB-CAL TIB-TAL TAL-CAL
10.12 (0.57) 1.85 (0.71) 10 (2.83)b 6.2 (1.82)b 3.8 (1.19)b
IR ER IR ER p = 0.028  p = 0.046
5.32 (0.68) 4.8 (0.62) 0.84 (0.36) 1.0 (0.63) p = 0.028
Varus/valgus
Instron machine Optotrak® system
ROM [°] NZ [°] TIB-CAL TIB-TAL TAL-CAL
5.65 (1.84)a 2.54 (0.99) 2.9 (0.46)ab 0.7 (0.07)b 2.2 (0.46)b
Varus Valgus Varus Valgus p = 0.028  p = 0.028
3.05 (0.97) 2.6 (0.95) 1.04 (0.51) 1.5 (0.67) p = 0.028
Dorsal/Plantar flexion
Instron machine Optotrak® system
ROM [°] NZ [°] TIB-CAL TIB-TAL TAL-CAL
5.30 (1.45)a 1.69 (0.58) 2.1 (0.39)ab 1.6 (0.27)b 0.5 (0.21)b
Dorsal Fl. Dlantar Fl. Dorsal Fl. Plantar Fl. p = 0.028  p = 0.028
2.55 (0.73) 2.75 (0.74) 0.85 (0.22) 0.84 (0.45) p = 0.028   
  1. Showing mean values (±standard deviation) under peak load. Rotational movement between tibia and calcaneus (TIB-CAL), tibia and talus (TIB-TAL), talus and calcaneus (TAL-CAL). Significant differences between Instron and Optotrak values marked with a. Significant differences within the Optotrak results are marked with b