The effect of repetitive flexion and extension fatigue loading on the young porcine lumbar spine, a feasibility study of MRI and histological analyses

Journal of Experimental Orthopaedics

Table 1 Basic characteristics of the FSUs

FSU	Load	Angle	Level	Distance from B-line
1	Flexion	10	L4–L5	10
2	Flexion	12	L2–L3	11
3	Flexion	12	L4–L5	12
4	Flexion	10	L2–L3	12
5	Flexion	10	L4–L5	13
6	Flexion	13	L2–L3	12
7	Flexion	15	L4–L5	12
8	Flexion	15	L2–L3	14
9	Extension	9	Th12–L1	10
10	Extension	10	L2–L3	10
11	Extension	10	L4–L5	10
12	Extension	9	Th12–L1	10
13	Extension	9	L2–L3	10
14	Extension	8	Th12–L1	10
15	Extension	9	Th12–L1	10
16	Extension	10	L4–L5	10

Angle in degrees. FSU Functional spinal unit. Distance in mm. B-line as in Fig. 2