23: Myths of the Physical Exam part 1
IMreasoning - Clinical reasoning for Doctors and Students
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The Negative Probability Ratio for Kernigs Sign in Meningitis
If you have a positive Brudinski sign, your post-test probability is 49%. But let's just be fair. No one would say that a likelihood ratio that close to one would actually mean anything. Out of every 10 patients with meningitis, you will find kernigs once and miss nine of them. If you don't find it, however, and this may be where there's a trap for younger players,. You still get a 48% chance that this is meningitis.
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