Me tranquiliza saber que la radiografía no muestra ninguna fractura.

Me tranquiliza means it reassures me, it calms me, or it puts my mind at ease.

The word me is the object pronoun meaning me. In Spanish, object pronouns usually go before the conjugated verb, so:

• me tranquiliza = reassures me

What is doing the reassuring? The whole idea saber que la radiografía no muestra ninguna fractura.

So the structure is basically:

• [Knowing that the X-ray shows no fracture] reassures me.

Because the subject of the verb is the whole infinitive phrase:

• saber que la radiografía no muestra ninguna fractura

In Spanish, an infinitive phrase like saber... can act like a singular noun idea, so the verb is singular:

• Me tranquiliza saber...
• It reassures me to know...

Even though the subject is long, it is still treated as one single idea.

Because Spanish often uses the infinitive where English uses to + verb or -ing as a noun-like idea.

Here, saber means to know / knowing, and the whole phrase means:

• knowing that the X-ray shows no fracture
• or more naturally in English, to know that the X-ray shows no fracture

So saber is not part of a tense here. It is functioning as the subject of the sentence.

Because que introduces the content of what is known.

• saber que... = to know that...

So:

• saber que la radiografía no muestra ninguna fractura
• to know that the X-ray shows no fracture

This is very common in Spanish:

• Sé que viene. = I know that he/she is coming.
• Es bueno saber que todo está bien. = It is good to know that everything is fine.

Because this clause states a fact, so Spanish uses the indicative, not the subjunctive.

• la radiografía no muestra ninguna fractura = the X-ray does not show any fracture

The speaker is presenting this as real information, not as doubt, possibility, or something wished for.

Also, the verb is inside the clause after saber que, and saber normally takes the indicative when talking about something known to be true.

Radiografía usually means X-ray image or radiograph, and sometimes by extension the X-ray exam itself.

In everyday Spanish, people may also say una radiografía when English speakers might simply say an X-ray.

Rayos X literally means X-rays and can refer to:

• the technology
• the radiation
• or informally the exam

So in many everyday situations, both can be understood, but radiografía is very natural in a medical sentence like this one.

Because radiografía is a feminine noun, so it takes:

• la radiografía

Like many nouns ending in -a, it is feminine. That is why adjectives and articles would also agree with it:

• la radiografía
• una radiografía
• la radiografía clara, etc.

Also notice the written accent in radiografía.

Yes, it is a kind of double negative, and that is normal in Spanish.

Spanish commonly uses:

• no + verb + ningún/ninguna + noun

So:

• no muestra ninguna fractura = it shows no fracture / it does not show any fracture

In English, standard usage usually avoids multiple negatives, but in Spanish this structure is completely correct and very common.

Other examples:

• No tengo ningún problema. = I don’t have any problem.
• No veo a nadie. = I don’t see anyone.

Because fractura is feminine.

• ningún is used before a masculine singular noun
• ninguna is used before a feminine singular noun

So:

• ningún problema
• ninguna fractura

Both mean no / not any, depending on context.

Because ninguno/ninguna is singular. It literally means something like not one or not a single.

So:

• ninguna fractura = no fracture / not a single fracture

Spanish often uses the singular here even when English might think more generally.

A very similar alternative would be:

• no muestra fracturas

That also means it doesn’t show fractures / it shows no fractures.

Yes. That would also be natural.

There is a small nuance:

• no muestra fracturas = neutral, straightforward
• no muestra ninguna fractura = slightly more emphatic, like no fracture at all or not a single fracture

Both are correct. The version with ninguna sounds a bit more explicit and reassuring, which fits this sentence well.

In medical or technical contexts, mostrar is the normal verb for show.

• La radiografía muestra... = The X-ray shows...

Although enseñar can sometimes mean to show, it is much more commonly used for:

• to teach
• or to show someone something in a more personal, physical sense

For test results, scans, reports, images, and evidence, mostrar is the usual choice.

Yes, absolutely.

That version is grammatically correct and means the same thing:

• Saber que la radiografía no muestra ninguna fractura me tranquiliza.

The original sentence:

• Me tranquiliza saber que...

sounds a bit more natural and common in everyday Spanish because it puts the emotional effect first: It reassures me...

The alternative is slightly more formal or more structurally explicit.

Because it expresses a present emotional reaction and a present piece of information.

• Me tranquiliza... = It reassures me / It is reassuring to me now
• la radiografía no muestra... = the X-ray does not show...

Even if the X-ray was taken in the past, the speaker is talking about the result as a current fact. That is very normal in both Spanish and English.

They are similar, but not always identical.

• me calma = it calms me
• me tranquiliza = it reassures me / it puts me at ease

In this sentence, me tranquiliza is especially good because the speaker is relieved by information. It is not just about becoming calm physically; it is about worry being reduced by knowing the result.

So tranquiliza fits the context very well.

A close breakdown is:

• Me = me
• tranquiliza = reassures / calms
• saber = to know / knowing
• que = that
• la radiografía = the X-ray
• no muestra = does not show
• ninguna fractura = any fracture / no fracture

So very literally:

• Knowing that the X-ray does not show any fracture reassures me.

More natural English would be:

• It reassures me to know that the X-ray shows no fracture.
• I’m reassured to know that the X-ray doesn’t show any fracture.