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Randomized Controlled Trial
. 2019 Mar 6;101(5):400-411.
doi: 10.2106/JBJS.18.00022.

Randomized Trial of Sacroiliac Joint Arthrodesis Compared with Conservative Management for Chronic Low Back Pain Attributed to the Sacroiliac Joint

Affiliations
Randomized Controlled Trial

Randomized Trial of Sacroiliac Joint Arthrodesis Compared with Conservative Management for Chronic Low Back Pain Attributed to the Sacroiliac Joint

Julius Dengler et al. J Bone Joint Surg Am. .

Abstract

Background: Sacroiliac joint pain is increasingly recognized as a cause of low back pain. We compared the safety and effectiveness of minimally invasive sacroiliac joint arthrodesis using triangular titanium implants and conservative management in patients with chronic sacroiliac joint pain.

Methods: This study was a prospective, multicenter randomized controlled trial of adults with chronic sacroiliac joint pain assigned to either conservative management or sacroiliac joint arthrodesis with triangular titanium implants. The study end points included self-rated low back pain (visual analog scale [VAS]), back dysfunction (Oswestry Disability Index [ODI]), and quality of life. Ninety percent of subjects in both groups completed the study.

Results: Between June 6, 2013, and May 15, 2015, 103 subjects were randomly assigned to conservative management (n = 51) or sacroiliac joint arthrodesis (n = 52). At 2 years, the mean low back pain improved by 45 points (95% confidence interval [CI], 37 to 54 points) after sacroiliac joint arthrodesis and 11 points (95% CI, 2 to 20 points) after conservative management, with a mean difference between groups of 34 points (p < 0.0001). The mean ODI improved by 26 points (95% CI, 21 to 32 points) after sacroiliac joint arthrodesis and 8 points (95% CI, 2 to 14 points) after conservative management, with a mean difference between groups of 18 points (p < 0.0001). Parallel improvements were seen in quality of life. In the sacroiliac joint arthrodesis group, the prevalence of opioid use decreased from 56% at baseline to 33% at 2 years (p = 0.009), and no significant change was observed in the conservative management group (47.1% at baseline and 45.7% at 2 years). Subjects in the conservative management group, after crossover to the surgical procedure, showed improvements in all measures similar to those originally assigned to sacroiliac joint arthrodesis. In the first 6 months, the frequency of adverse events did not differ between groups (p = 0.664). By month 24, we observed 39 severe adverse events after sacroiliac joint arthrodesis, including 2 cases of sacroiliac joint pain, 1 case of a postoperative gluteal hematoma, and 1 case of postoperative nerve impingement. The analysis of computed tomographic (CT) imaging at 12 months after sacroiliac joint arthrodesis showed radiolucencies adjacent to 8 implants (4.0% of all implants).

Conclusions: For patients with chronic sacroiliac joint pain due to joint degeneration or disruption, minimally invasive sacroiliac joint arthrodesis with triangular titanium implants was safe and more effective throughout 2 years in improving pain, disability, and quality of life compared with conservative management.

Level of evidence: Therapeutic Level I. See Instructions for Authors for a complete description of levels of evidence.

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Figures

Fig. 1
Fig. 1
Patient flow. SIJA = sacroiliac joint arthrodesis, CM = conservative management, FU = follow-up, m = month, X-over = crossover, and LTFU = lost to FU.
Fig. 2
Fig. 2
Change in VAS low back (LB) pain, VAS leg pain, ODI, EQ-5D time trade-off (TTO), EQ-5D VAS, and Zung Depression Scale scores. Blue indicates the conservative management group, and green indicates the sacroiliac joint arthrodesis group. The last-observation-carried-forward method was used to estimate values after crossover. The values shown are the mean. The error bars indicate the 95% CI.
Fig. 3
Fig. 3
Change in functional test (active straight leg raise test) by treatment and time (left) and the number of positive physical examination signs (right). Blue indicates the conservative management group, and green indicates the sacroiliac joint arthrodesis group. The solid line indicates the right sacroiliac joint affected, and the dotted line indicates the left sacroiliac joint affected. The last-observation-carried-forward method was used to estimate values after crossover. The values shown are the mean. The error bars indicate the 95% CI.
Fig. 4
Fig. 4
Proportion of subjects reporting opioid use in the past 2 weeks by treatment and study visit. Blue indicates the conservative management (CM) group, and green indicates the sacroiliac joint arthrodesis (SIJA) group.
Fig. 5-A
Fig. 5-A
Change in walking distance and ambulatory status.
Fig. 5-B
Fig. 5-B
Change in work status and comparison with baseline.
Fig. 5-C
Fig. 5-C
Change in satisfaction and desirability of having a surgical procedure again by treatment and follow-up visit.
Fig. 6
Fig. 6
Change in VAS low back (LB) pain, VAS leg pain, ODI, Zung Depression Scale, EQ-5D time trade-off (TTO), and EQ-5D VAS scores including subjects who crossed over from conservative management to sacroiliac joint arthrodesis. Green indicates the subjects initially assigned to sacroiliac joint arthrodesis, blue indicates subjects assigned to the conservative management group prior to crossover, and gray indicates conservative management subjects who crossed over to surgical treatment with the sacroiliac joint arthrodesis group after the 6-month visit. The values shown are the mean. The error bars indicate the 95% CI.
Fig. 7
Fig. 7
Imaging of typical configuration of implants. Fig. 7-A Inlet-view pelvic radiograph. Fig. 7-B A 12-month CT image from a different subject showing no radiolucencies around the first implant. Fig. 7-C A 12-month CT image from another subject showing radiolucency around the second implant in the sacrum.
Fig. 8
Fig. 8
A 12-month CT image depicting bilateral implants with bone apposition along the entire length of the superior and inferior sides of both implants. Also, there is bone overgrowth at the outer iliac cortex (the left side is greater than the right side), suggesting complete implant integration into the ilium. However, there is little bone apposition along the implants within the joint.

Comment in

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