Sacral Thrust Test
Original Editor - Els Van haver
The sacral thrust test is a pain provocation test used to diagnose sacroiliac dysfunction. One single positive test does not have high diagnostic accuracy but a combination with other sacroiliac pain provocation tests gives valid evidence for sacroiliac dysfunction.
The test is also known as:
- Sacral compression test
- Downwards pressure test
- Sacral spring test
With the patient prone, the examiner applies an anteriorly directed pressure over the sacrum. One hand is placed directly on the sacrum and is being reinforced by the other hand. Purpose is to apply an anterior shear force to both sacroiliac joints since the ilia are fixed by the examination bench. The test is positive if pain is reproduced in the sacroiliac region. 
The gold standard to evaluate sacroiliac pain provocation tests is an intra-articular injection of a local anesthetic into the sacroiliac joint, under the guidance of radiological imaging.  A specified level of pain reduction (70-90%) must be accomplished. There are however some problems related to the use of this gold standard: 
- Only intra-articular pain sources are investigated
- Not all structures of the joint capsule are affected
- The use of a needle may cause or increase pain
Many pain provocation tests for the sacroiliac region exist and have been subject to clinical research. There is however no consensus on how to endorse clinical decision-making. Grade A recommendation based on 3 level 1B studies identifies 4 to 5 tests with highest specifciity and sensitivity among known sacroiliac pain provocation tests and acceptable intertester reliability to be included in the clinical examination: 
Laslett et al (2005) state that no further examination is wishful if both distraction and thigh trust test provoke familiar pain. If only one test or 2 other tests are positive, further testing is required to obtain a valid result. Values for diagnostic utility can be found here.
The sacral thrust test has a moderate intertester reliability of 74 (kappa=0,52 and p<0,001), sensitivity of 63% and specificity of 75%. Positive predictive value is 56% and negative predictive value is 80%.
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