Si el esguince no mejora esta semana, la fisioterapeuta dice que tendré que usar muletas más tiempo.

Because si and sí are different words:

• si = if
• sí = yes, or sometimes himself/herself/itself after a preposition

So in this sentence, Si el esguince no mejora... means If the sprain doesn’t improve..., so it must be si without an accent.

In Spanish, when si means if in a real, possible condition, the verb after it normally takes the present indicative, not the future.

So Spanish says:

• Si el esguince no mejora... = If the sprain doesn’t improve...

Not:

• Si el esguince no mejorará... ❌

This is a very common pattern:

• Si llueve, me quedo en casa.
• Si viene mañana, hablamos.
• Si no mejora, tendré que usar muletas.

The future idea is usually shown in the main clause, here with tendré.

Esguince means sprain.

It is a masculine noun, so it takes el:

• el esguince

This is just something you have to learn with the noun. The ending does not always clearly tell you the gender in Spanish.

Examples:

• el esguince
• un esguince
• mi esguince

Yes. In Spanish, mejorar can be used intransitively, meaning to improve or to get better.

So:

• El esguince no mejora = The sprain isn’t improving / isn’t getting better

You do not need a reflexive verb here.

This is very natural with illnesses, injuries, symptoms, and situations:

• La rodilla mejora
• La tos no mejora
• La situación mejora poco a poco

Because the sentence begins with a conditional clause:

• Si el esguince no mejora esta semana, ...

Then comes the main clause:

• ..., la fisioterapeuta dice que...

In Spanish, when the if-clause comes first, it is normal to separate it with a comma.

So this punctuation is standard and natural.

Because esta semana works like this week in English.

Spanish often uses demonstrative + noun directly for time expressions:

• esta semana
• este mes
• este año
• esta tarde

So:

• no mejora esta semana = it doesn’t improve this week

You could sometimes hear en esta semana, but here it is less natural. Esta semana is the normal choice.

Here, la fisioterapeuta shows that the physiotherapist is female.

The noun fisioterapeuta often keeps the same form for both genders, and the article tells you whether it is masculine or feminine:

• el fisioterapeuta = male physiotherapist
• la fisioterapeuta = female physiotherapist

So the ending -a here does not automatically mean the word itself is feminine in all cases. The article is important.

Because the sentence is reporting what she says will happen, not a hypothetical or conditional idea.

• dice que tendré que usar muletas = she says that I will have to use crutches

Spanish commonly keeps the future after dice que when the future meaning is still valid from the speaker’s point of view.

Using tendría would change the meaning and make it more conditional or dependent on another context.

So here:

• dice que tendré = natural and direct
• dice que tendría = different nuance, not the basic meaning here

Because tener is irregular in the future tense.

Instead of using the full infinitive stem tener-, it changes to tendr-:

• tendré
• tendrás
• tendrá
• tendremos
• tendréis
• tendrán

So:

• tener → tendr-
  • future endings

The accent in tendré shows the stress falls on the last syllable.

It uses the structure:

• tener que + infinitive

This means to have to do something.

So:

• tendré que usar = I will have to use

Breakdown:

• tendré = I will have
• que = to
• usar = use

Together, it expresses obligation or necessity.

Examples:

• Tengo que ir = I have to go
• Tuve que esperar = I had to wait
• Tendré que usar muletas = I will have to use crutches

Because Spanish often leaves out the article when speaking about something in a general way after certain verbs like usar.

So:

• usar muletas = to use crutches

This sounds natural when you mean crutches as a general aid, not a specific pair already being highlighted.

If you say usar las muletas, it can sound more like you are referring to specific crutches already known in the conversation.

Both can be possible, but usar muletas is very natural here.

Spanish often uses más tiempo where English would say longer.

So:

• usar muletas más tiempo = use crutches for longer / for more time

It is a very common Spanish way of expressing duration.

You may also hear:

• por más tiempo

But in this sentence, más tiempo on its own is perfectly natural and idiomatic.

Yes. Both are natural, but they feel slightly different in tone.

• tendré que usar muletas = I will have to use crutches
• voy a tener que usar muletas = I’m going to have to use crutches

The first is the simple future; the second uses ir a + infinitive, which is also very common in everyday speech.

In this sentence, tendré que sounds completely normal and slightly more compact.