Pressure (compression force) is mild (C, grade 1) when the pain is severe (Numerical Rating (NR) 7-10), easily provoked and reflect a major SIJ dysfunction, medium (D, grade 2) when pain is moderate (NR 4-6), pointing to an intermediate level of SIJ dysfunction. Deep compression (E) is needed when the pain is mild (NR 1-3), reflecting a little dysfunction of the SIJ. Compression of the SIJ will not elicit pain in the absence of SIJ dysfunction.
