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Herniated Disk: Sensitivity and Specificity

Introduction: None written.

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Tags: Musculoskeletal Tag this Diagnosis.

The sensitivity and specificity of findings for Herniated Disk are listed below. See the left navigation bar to change the display.

Pre-Test Probability (Prevalence): %.	Post-Test Probability (Predictive Value): %.	Switch to display mode.
Note that calculating probabilities from more than one** finding is inherently inaccurate because findings are not independent. (For example, using two positive findings that share a common pathogenesis is likely to overestimate the true probability.)

Specific Findings
Finding	Result	Sensitivity	Specificity
[ + ] Crossed Straight Leg Raise	+ 0 -	29%	88%
pain on affected side while raising contralateral leg Study: Best Pract Res Clin Rheumatol. 2008 Jun;22(3):471-82. PMID: 18519100

Sensitive Findings
Finding	Result	Sensitivity	Specificity
[ + ] Straight Leg Raise	+ 0 -	91%	26%
passive flexion of hip with extended knee elicits radicular pain Study: Best Pract Res Clin Rheumatol. 2008 Jun;22(3):471-82. PMID: 18519100

Findings With Unspecified Accuracy
Finding	Result	Sensitivity	Specificity
[ + ] Bragard's Sign		No accuracy specified.
This test is done with the patient supine with both legs straight. The examiner straight leg raises the leg on the affected side until the point the patient feels pain. At this position, the examiner firmly dorsiflexes the foot. If there is an increase in radicular pain from the above, the test is considered positive. Study: no study specified.
[ + ] Naffziger's Sign		No accuracy specified.
manual compression of the jugular veins bilaterally. An increase or aggravation of pain or sensory disturbance over the distribution of the involved nerve root confirms the presence of an extruded intervertebral disk or other mass. Study: no study specified.