sensitivity and specificity of diagnostic/discriminating tests

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I know the definition of true positive rate and true negative rate, I know how to calculate them, and I know the mnemonic “SpIn and SnOut” but I need an analogy or something because I don’t truly understand the difference.

Let’s say a compound fracture has a bone sticking out 100% of the time. Would “bone sticking out” be 100% specific or 100% sensitive to a compound fracture?

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