Table 3.

The mean D-area during flexion and extension

	L1–2	L2–3	L3–4	L4–5	L5–S
Mean D-area (mm2) ± SD
Flexion	167.7 ± 38.7	130.4 ± 44.9	96.3 ± 37.6	72.7 ± 37.8	105.6 ± 45.8
Extension	146.5 ± 41.2	104.4 ± 40.1	73.6 ± 35.2	61.4 ± 36.3	91.3 ± 44.6