Sacroiliac joint stability: Finite element analysis of implant number, orientation, and superior implant length

doi:10.5312/wjo.v9.i3.14

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World Journal of Orthopedics

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Baishideng Publishing Group Inc, 7041 Koll Center Parkway, Suite 160, Pleasanton, CA 94566, USA

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World J Orthop. Mar 18, 2018; 9(3): 14-23
Published online Mar 18, 2018. doi: 10.5312/wjo.v9.i3.14

Table 5 Change in sacroiliac joint lateral bending range of motion (°) as a result of reducing the number of implants

Treatment	Implants (positions)	Superior implant ending point	Range of motion (°)	Motion increase (°)	% 3 implant motion
Intact	-	-¹	0.66	-	-
Inline	3 (S, M, I)	Mid-ala	0.45	Reference configuration
Inline	2 (S, M, -)	Mid-ala	0.5	0.05	11
Inline	2 (S, -, I)	Mid-ala	0.47	0.02	4
Inline	2 (-, M, I)	-¹	0.53	0.08	18
Inline	1 (S, -, -)	Mid-ala	0.58	0.13	29
Inline	1 (-, M, -)	-¹	0.65	0.2	44
Inline	1 (-, -, I)	-¹	0.69	0.24	53
Inline	3 (S, M, I)	Mid-sacrum	0.41	Reference configuration
Inline	2 (S, M, -)	Mid-sacrum	0.45	0.04	10
Inline	2 (S, -, I)	Mid-sacrum	0.43	0.02	5
Inline	1 (S, -, -)	Mid-sacrum	0.58	0.17	41
Transarticular	3 (S, M, I)	Mid-ala	0.41	Reference configuration
Transarticular	2 (S, M, -)	Mid-ala	0.45	0.04	10
Transarticular	2 (S, -, I)	Mid-ala	0.42	0.01	2
Transarticular	2 (-, M, I)	-¹	0.47	0.06	15
Transarticular	1 (S, -, -)	Mid-ala	0.58	0.17	41
Transarticular	1 (-, M, -)	-¹	0.6	0.19	46
Transarticular	1 (-, -, I)	-¹	0.62	0.21	51
Transarticular	3 (S, M, I)	Mid-sacrum	0.38	Reference configuration
Transarticular	2 (S, M, -)	Mid-sacrum	0.41	0.03	8
Transarticular	2 (S, -, I)	Mid-sacrum	0.39	0.01	3
Transarticular	1 (S, -, -)	Mid-sacrum	0.58	0.2	53
Treatment	Implants (positions)	Superior implant ending point	% 3 Implant motion	Implants (positions)	Median (%) [range]
Inline	2 (S, -, I)	Mid-ala	4	2 (S, -, I)	3.5% (2-5)
Inline	2 (S, -, I)	Mid-sacrum	5
Transarticular	2 (S, -, I)	Mid-ala	2
Transarticular	2 (S, -, I)	Mid-sacrum	3
Inline	2 (S, M, -)	Mid-ala	11	2 (S, M, -)	10% (8-11)
Inline	2 (S, M, -)	Mid-sacrum	10
Transarticular	2 (S, M, -)	Mid-ala	10
Transarticular	2 (S, M, -)	Mid-sacrum	8
Inline	2 (-, M, I)	-¹	18	2 (-, M, I)	16.5% (15-18)
Transarticular	2 (-, M, I)	-¹	15	2 (-, M, I)	16.5% (15-18)
Inline	1 (S, -, -)	Mid-ala	29	1 (S, -, -)	41% (29-53)
Inline	1 (S, -, -)	Mid-sacrum	41
Transarticular	1 (S, -, -)	Mid-ala	41
Transarticular	1 (S, -, -)	Mid-sacrum	53
Inline	1 (-, M, -)	-¹	44	1 (-, M, -)	45% (44-46)
Transarticular	1 (-, M, -)	-¹	46	1 (-, M, -)	45% (44-46)
Inline	1 (-, -, I)	-¹	53	1 (-, -, I)	52% (51-53)
Transarticular	1 (-, -, I)	-¹	51	1 (-, -, I)	52% (51-53)

¹Configuration does not include a superior implant. S: Superior; M: Middle; I: Inferior.

Citation: Lindsey DP, Kiapour A, Yerby SA, Goel VK. Sacroiliac joint stability: Finite element analysis of implant number, orientation, and superior implant length. World J Orthop 2018; 9(3): 14-23
URL: https://www.wjgnet.com/2218-5836/full/v9/i3/14.htm
DOI: https://dx.doi.org/10.5312/wjo.v9.i3.14