После падения у неё заболело запястье.

Because после always takes the genitive case.

• падение = a fall / falling (dictionary form, nominative)
• после падения = after the fall / after falling

So this is a normal case pattern:

• после урока = after the lesson
• после дождя = after the rain
• после падения = after the fall

This is a very common Russian way to talk about a person having a condition, sensation, or body-part issue.

Literally, у неё заболело запястье is something like:

• at her, the wrist started to hurt

In natural English, we say:

• her wrist started hurting
• she developed pain in her wrist

Russian often avoids making the person the grammatical subject in sentences like this. Instead, it uses:

• у + genitive for the person
• the body part as the grammatical subject

Compare:

• У меня болит голова. = My head hurts. / I have a headache.
• У него заболела спина. = His back started hurting.

After most prepositions, Russian third-person pronouns add н- at the beginning.

So:

• её = her
• but у неё = at her / of her
• к нему = to him
• с ними = with them

This is just a standard pronoun rule after prepositions.

Because the verb agrees with запястье, which is a neuter singular noun.

• запястье = wrist
• it is grammatically neuter
• so in the past tense the verb must also be neuter singular: заболело

Compare:

• запястье заболело — the wrist started hurting
• рука заболела — the arm/hand started hurting
• глаза заболели — the eyes started hurting

The past tense in Russian agrees with the subject in gender and number.

This is an aspect question.

• болело = was hurting / hurt / ached
• заболело = started to hurt / began hurting

So заболело is perfective and often marks the beginning of pain.

That makes it especially natural with после падения:

• После падения у неё заболело запястье.
  = After the fall, her wrist started hurting.

If you said:

• После падения у неё болело запястье.

that would sound more like:

• After the fall, her wrist hurt / was hurting

So the sentence with заболело focuses more on the onset of the pain.

That version is possible, but у неё заболело запястье is often more natural in Russian.

Russian frequently uses у + person when talking about body parts, symptoms, or physical states. It sounds idiomatic and very common.

Compare:

• У неё заболело запястье. = Her wrist started hurting.
• Её запястье заболело. = Her wrist started hurting.

The second version is grammatically correct, but it can sound a bit more direct or more focused on the wrist itself as an object of discussion. The у неё version is often the more everyday way to say it.

Russian word order is flexible, and the end of the sentence often carries the most important or newest information.

Here the structure is very natural:

• После падения = sets the time/context
• у неё = identifies the person affected
• заболело запястье = tells what happened, with запястье as the key new detail

So the sentence flows from context to person to result.

Other word orders are possible, but they can change emphasis:

• После падения запястье у неё заболело.
• У неё после падения заболело запястье.

These are not wrong, but the original order is very normal and smooth.

It can work as either in English, depending on context.

• падение is a noun meaning fall or falling
• so после падения can be translated as:
  • after the fall
  • after falling

English chooses whichever sounds more natural in context.

If Russian wanted to be more explicit about she fell, it could say:

• После того, как она упала, у неё заболело запястье.
  = After she fell, her wrist started hurting.

Not necessarily.

It specifically says that her wrist started hurting after the fall. That may imply an injury, but the sentence itself does not say:

• that it was broken
• that it was sprained
• that the fall definitely caused damage

It only describes the pain.

For a clearer injury statement, Russian might say something like:

• Она повредила запястье. = She injured her wrist.
• Она сломала запястье. = She broke her wrist.

Yes, запястье is the normal word for wrist.

It refers specifically to the wrist area/joint, not the whole hand.

Useful related words:

• рука = arm; also hand in many contexts
• кисть = hand (especially the hand as a body part, more precise)
• запястье = wrist

So if the pain is in the wrist joint area, запястье is the right word.

The main stresses are:

• после
• паде́ния
• неё
• заболе́ло
• запя́стье

A rough pronunciation guide:

• После паде́ния у неё заболе́ло запя́стье.
• POS-lye pa-DYE-ni-ya u ni-YO za-ba-LYE-la za-PYAS-tye

A couple of important points:

• ё is always stressed: неё
• запястье has stress on я
• падения has stress on де

Yes, sometimes.

If everyone already knows whose wrist you mean, Russian could say:

• После падения заболело запястье.

That means:

• After the fall, the wrist started hurting.

But without у неё, the sentence is less explicit about whose wrist it is. In many real situations, Russian keeps у неё because it sounds natural and avoids ambiguity.