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. Author manuscript; available in PMC: 2005 Dec 15.
Published in final edited form as: Ann Biomed Eng. 2005 Mar;33(3):391–401. doi: 10.1007/s10439-005-1742-x

TABLE 1.

Facet joint capsule principal strains, E1 and E2 (which lie closest to the x- and y-axis, respectively).

L3-4
L4-5
L5-S1
25th Med. 75th 25th Med. 75th 25th Med. 75th
E1
Pre-SLF −0.12 −0.10 −0.09 −0.10 −0.08 −0.07 −0.08 −0.05 −0.05
SLF −0.15 −0.12 −0.10 −0.11 −0.10 −0.10 −0.10 −0.07 −0.07
Post-SLF −0.14 −0.11 −0.10 −0.09 −0.09 −0.09 −0.10 −0.06 −0.06
20 Post-SLF −0.15 −0.15 −0.10 −0.08 −0.08 −0.07 −0.11 −0.08 −0.06
E2
Pre-SLF 0.08 0.13 0.17 0.10 0.12 0.18 0.07 0.08 0.10
SLF 0.11 0.15 0.20 0.13 0.15 0.21 0.09 0.11 0.12
Post-SLF 0.11 0.15 0.22 0.11 0.13 0.13 0.09 0.09 0.10
20 Post-SLF 0.10 0.18 0.19 0.10 0.10 0.12 0.06 0.09 0.12

Note. E1 and E2 were large during 10 cycles to 10 Nm at L5-S1 (Pre), during 20 min of static lumbar flexion (SLF), during 10 cycles to 10 Nm after SLF (Post), and after being allowed a 20-min recovery period (20 Post). Strains were not normally distributed and the median (Med.) and interquartile range (25th percentile–75th percentile) are reported instead.