Table 1.

Anatomical and radiographic measurements of the anterior, middle and posterior human TIVD heights

	Anterior disc height (ADH)						Posterior disc height (PDH)						Middle disc height (MDH)*
	Anatomical measurement		Radiographic measurement		Anatomical–radiographic ratio		Anatomical measurement		Radiographic measurement		Anatomical-Radiographic ratio		Anatomical measurement
Disc level	Mean	SD	Mean	SD	Difference	%	Mean	SD	Mean	SD	Difference	%	Mean	SD	Average disc height **
C7–T1	4.5	0.79	3.96	0.22	0.54	−11.90	4.5	0.51	3.20	0.55	1.30	−28.91	5.6	0.63	4.5
T1–2	4.5	0.77	3.69	0.62	0.81	−18.01	4.3	0.62	3.04	0.56	1.26	−29.40	5.7	0.66	4.4
T2–3	3.4	0.97	3.23	0.40	0.17	−4.89	3.5	0.99	1.95	0.28	1.55	−44.22	5.8	0.79	3.5
T3–4	3.3	0.30	3.07	0.44	0.23	−6.96	3.2	0.49	2.09	0.46	1.11	−34.69	4.4	0.8	3.3
T4–5	3.0	0.74	2.85	0.36	0.15	−5.11	3.3	0.45	2.00	0.21	1.30	−39.54	5.0	0.61	3.2
T5–6	3.5	0.37	3.36	0.29	0.14	−3.93	3.6	0.47	2.10	0.30	1.50	−41.71	4.7	0.91	3.5
T6–7	4.1	0.35	3.70	0.41	0.40	−9.80	4.1	0.65	2.18	0.50	1.92	−46.72	5.5	0.45	4.1
T7–8	4.2	0.97	4.06	0.67	0.14	−3.35	3.6	0.90	2.47	0.50	1.13	−31.44	5.3	0.58	3.9
T8–9	5.6	1.17	4.52	0.43	1.08	−19.22	5.0	0.91	2.49	0.60	2.51	−50.12	6.1	0.89	5.3
T9–10	5.4	1.74	4.88	1.03	0.52	−9.70	4.2	1.10	2.97	0.60	1.23	−29.36	5.5	0.90	4.8
T10–11	7.2	1.21	5.91	0.77	1.29	−17.94	5.8	1.00	3.66	0.70	2.14	−36.83	6.7	1.18	6.5
T11–12	6.0	1.14	5.90	0.70	0.10	−1.67	4.8	1.26	3.23	0.48	1.57	−32.63	6.5	1.15	5.4

Refer to Fig. 1 for abbreviations.

All measurements are in mm.

^*No radiographic measurement was performed for the MDH.

^**Average disc height is the average of the anatomical measurement of the ADH and PDH at each vertebral level. o e digital.