Sacroiliac Joint Special Test Cluster

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Background

Test Item Cluster (TIC) is a group of special tests which are developed to facilitate clinical decision making by improving the diagnostic utility. 

A study by Levangie et al had developed a TIC for identifying SIJ dysfunction with the following tests: standing flexion test, sitting PSIS palpation, supine long sitting test, and prone knee flexion test. The investigators assessed the diagnostic utility of those tests by comparing findings of patients who complained of LBP with those of patients being treated for other physical impairments not related to the back. They reported that the cluster of these tests exhibited a sensitivity of 0.82, specificity of 0.88, + LR of 6.83, and - LR of 0.20. It needs to be noted, however, that the reliability of those special tests used for this TIC is poor. Inter-rater reliability kappa values of standing flexion test, sitting PSIS palpation, and prone knee flexion test are reported as follows: 0.08 - 0.32, 0.23 - 0.37, 0.21 - 0.26 respectively. Additionally, validity of the results should be evaluated carefully due to the reference standard used for this study. 

More recently, Laslett et al assessed the diagnostic utility of the McKenzie evaluation combined with the following SIJ tests: distraction, thigh thrust, Gaenslen, compression, and sacral thrust. The McKenzie assessment consisted of flexion in standing, extension in standing, and right/left side bending, flexion in lying and extension in lying. The repeated movements were performed in sets of 10, while centralization and peripheralization of symptoms were recorded. The centralization phenomena with repeated movement was used to identify the patients with discogenic pain. After the McKenzie evaluation, patients with discogenic pain was ruled out. Authors found that the cluster of SIJ tests used within the context of a specific clinical reasoning process can facilitate identifying the involvement of SIJ dysfunction. 

Laslett et al further investigated the diagnostic power of pain provocation sacroiliac joint (SIJ) tests individually and in various combinations, in relation to a diagnostic injection. The tests employed in this study were: distraction, right sided thigh thrust, right sided Gaenslen's test, compression and sacral thrust. Those tests were chosen due to its acceptable inter-rater reliability. They found that composites of provocation SIJ tests had significant diagnostic utility. Any 2 of 4 selected tests (distraction, thigh thrust, compression, and sacral thrust) have the best predictive power. When all 6 SIJ provocation tests does not reproduce symptoms, the SIJ pathology can be ruled out.

Description of Provocation Tests

Tests	Description (Positive Findings)
Distraction	Pt supine. Examiner applies posterolateral directed pressure to bilateral ASIS. (Reproduction of pain)
Compression	Pt sidelying. Examiner compresses pelvis with pressure applied over the iliac crest directed at the opposite iliac crest. (Reproduction of symptoms)
Thigh Thrust	Pt supine. Examiner place hip in 90 deg flexion and adduction. Examiner then applies posteriorly directed force through the femur at varying angles of abduction/adduction. (Reproduction of buttock pain)
Gaenslen's	Pt supine with both legs extended. The test leg is passively brought into full knee flexion, while the opposite hip remains in extension. Overpressure is then applied to the flexed extremity. (Reproduction of pain)
Sacral Thrust	Pt prone. Examiner delivers an anteriorly directed thrust over the sacrum. (Reproduction of pain)

Diagnostic Value of Individual SIJ Provocation Tests

	Distraction	Compression	Thigh Thrust	Gaenslen's (R)	Gaenslen's (L)	Sacral Thrust
Sensitivity	0.60	0.69	0.88	0.53	0.50	0.63
Specificity	0.81	0.69	0.69	0.71	0.77	0.75
+ LR	3.20	2.20	2.80	1.84	2.21	2.50
- LR	0.49	0.46	0.18	0.66	0.65	0.50

Diagnostic Utility of TIC for SIJ Provocation Tests

Laslett et al identified the TIC for SIJ dysfunction after the McKenzie evaluation to rule out discogenic pain. When 3 of 4 tests (distraction, thigh thrust, Gaenslen, sacral thrust, compression) are positive, it indicates SIJ dysfunction. The diagnostic utility was as follows:

	Values (95% CI)
Sensitivity	0.91 (0.62, 0.98)
Specificity	0.78 (0.61, 0.89)
+ LR	4.16 (2.16, 8.39)
- LR	0.12 (0.02, 0.49)

A follow up study by Laslett et al demonstrated that the Gaenslen's test did not contribute positively when tests were combined and may be omitted from the diagnostic process without compromising diagnostic confidence. The optimal rule was to perform the distraction, compression, thigh thrust and sacral thrust tests but stopping when there are 2 positives. The diagnostic value of 2 positive tests of the 4 selected test was as follows:

	Values (95% CI)
Sensitivity	0.88 (0.64, 0.97)
Specificity	0.78 (0.61, 0.89)
+ LR	4.00 (2.13, 8.08)
- LR	0.16 (0.04, 0.47)

Recent Related Research (from Pubmed)

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References

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