Postural spinal balance defined by net intersegmental moments: Results of a biomechanical approach and experimental errors measurement

Table 1 Mean net sagittal articular moments and maximum net sagittal articular moments in N.m for each volunteer

		Cervical	Thoracic	Lumbar	Hip right	Hip left	Knee right	Knee left	Ankle right	Ankle left
Mean	Volunteer 1	-0.65	-9.23	-0.45	10.73	14.62	-6.7	-5.81	-13.04	-7.52
moments	Volunteer 2	-0.03	-4.2	-0.86	3.79	4.82	-7.59	-10.09	-7.76	-6.08
Max	Volunteer 1	0.71	10.76	7.71	11.35	15.2	7.6	7.59	14.06	8.59
moments	Volunteer 2	0.43	5.92	3.91	4.27	5.08	8.12	10.44	8.5	6.49

Signs of the moments were consistent between the two subjects. Maximum moments are expressed in absolute values.

Table 2 Results of the experimental error measurement (N.m)

	Cervical	Thoracic	Lumbar	Hip right	Hip left	Knee right	Knee left	Ankle right	Ankle left
Inter-trial error	0.26	1.36	1.08	1.66	1.71	1.55	1.5	2.14	2.03
Inter-session error	0.43	5.27	5.24	3.21	3.78	2.09	2.75	2.46	2.8
Inter-therapist error	0.48	6.68	6.64	4.09	4.5	4.22	4.07	2.6	2.86

Table 3 Summary of differences imposed by the “radiographic” posture compared with the free standing

		Cervical	Thoracic	Lumbar
Volunteer 1	Mean Diff FSP vs RX (N/m)	1.15	2.79	0.35
	Inter-trial significant diff	Yes	Yes	No
	Inter-session significant diff	Yes	No	No
	Inter-therapist significant diff	Yes	No	No
Volunteer 2	Mean Diff FSP vs RX (N/m)	0.11	0.88	0.3
	Inter-trial significant diff	No	No	No
	Inter-session significant diff	No	No	No
	Inter-therapist significant diff	No	No	No

Mean differences are in absolute values. Difference is considered significant when superior to experimental error measure.