New physical examination tests for lumbar spondylolisthesis and instability: low midline sill sign and interspinous gap change during lumbar flexion-extension motion

Table 2 Diagnostic validity of the “low midline sill sign” for the detection of lumbar spondylolisthesis

		Radiographic lumbar spondylolisthesis
		Positive	Negative
Low midline sill sign	Positive	26	7
Low midline sill sign	Negative	6	57

The sensitivity, specificity, positive predictive value, and negative predictive value of the test were 81.3%, 89.1%, 78.8%, and 90.5%, respectively.

ISSN: 1471-2474