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

Table 3 Diagnostic validity of the “interspinous gap change” during lumbar flexion-extension motion for the detection of lumbar instability

		Radiographic lumbar instability
		Positive	Negative
Interspinous gap change	Positive	37	11
Interspinous gap change	Negative	8	17

The sensitivity, specificity, positive predictive value, and negative predictive value of the test were 82.2%, 60.7%, 77.1%, and 68.0%, respectively.

ISSN: 1471-2474