BMC Musculoskeletal Disorders

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

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

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