Table 1. Intradiscal Pressures (MPa) for different static and dynamic activities.

	L2-L3			L4-L5
	median	range+	range -	median	range+	range -
lying intra-op	0.43	0.00	0.02	0.53	0.00	0.02
lying post-op	0.73	0.19	0.09	0.86	0.16	0.05
sleeping	0.43	0.04	0.05	0.51	0.03	0.02
standing	0.70	0.21	0.10	0.73	0.32	0.09
lying down	2.25	0.06	0.06	2.38	0.08	0.07
standing up	3.73	0.77	0.39	4.78	0.12	1.85
walking	1.60	1.98	0.26	1.48	1.74	0.28