Investigation of bone quality of the first and second sacral segments amongst trauma patients: concerns about iliosacral screw fixation

Journal of Orthopaedics and Traumatology

Official Journal of the Italian Society of Orthopaedics and Traumatology

Table 2 Values of bone mineral density in Hounsfield units of analogous ROI locations at S1 and S2 with differences

Patient no.	Difference anterior ROI	% Difference S2 vs. S1 anterior ROI	Difference posterior ROI	% Difference S2 vs. S1 anterior ROI	Difference right ROI	% Difference S2 vs. S1 anterior ROI	Difference left ROI	% Difference S2 vs. S1 anterior ROI
1	69	77	57	78	162	49	132	54
2	100	58	71	58	164	39	167	36
3	41	97	60	96	75	95	21	98
4	45	84	12	94	110	63	121	59
5	−10	104	98	63	45	83	13	95
6	−6	103	122	53	136	57	143	56
7	62	95	86	94	30	98	78	94
8	63	95	27	98	26	98	37	97
9	55	96	117	91	45	96	12	99
10	38	88	131	60	44	83	82	73
11	−13	103	156	71	103	77	18	96
12	162	88	155	89	208	85	177	87
13	60	80	313	20	123	57	115	57
14	43	70	97	30	151	20	174	20
15	−122	142	51	85	122	68	13	96
16	25	90	61	71	169	45	91	64
17	45	79	82	56	−2	102	22	85
18	−29	112	104	60	191	51	155	53
19	27	88	34	86	129	52	55	80
20	−8	103	103	65	87	71	141	56
21	130	37	177	25	89	31	123	27
22	200	51	200	50	121	61	128	65
23	26	83	−4	103	157	38	84	59
24	186	49	106	38	89	62	121	53
25	115	73	147	60	188	51	144	61
Mean difference (p value)	52 (p = 0.0011)		102 (p < 0.0001)		110 (p < 0.0001)		95 (p < 0.0001)
Percent difference of S2 compared to S1		86		68		65		69
					Average global density of S2 compared to S1			71.9