Więzadło wzmacnia staw.

A rough English-friendly pronunciation is:

vyen-ZA-dwo vz-MATS-nya staf

A few key sounds:

• w sounds like English v
• ł sounds like English w
• ę is a nasal vowel; before some consonants it often sounds close to en/em
• ń/ni gives a soft ny sound
• aw in staw is pronounced more like af at the end, because Polish final w is devoiced

Stress in Polish usually falls on the second-to-last syllable:

• wię-ZA-dło
• wz-MAC-nia

In this sentence, więzadło is the subject and staw is the direct object.

So grammatically:

• więzadło = the thing doing the action
• wzmacnia = the action
• staw = the thing receiving the action

However, this sentence is a little tricky for learners because the noun endings do not clearly distinguish subject from object here. Polish speakers mainly understand it from:

• the usual subject–verb–object order
• the meaning/context

Because staw is a masculine inanimate noun, and in Polish the accusative singular of masculine inanimate nouns is usually the same as the nominative singular.

So:

• nominative: staw
• accusative: staw

That is why the direct object still appears as staw, not in a visibly different form.

The ending -o strongly suggests that więzadło is a neuter singular noun.

In this sentence it is in the nominative singular, because it is the subject.

A useful thing to remember:

• many Polish neuter nouns end in -o, -e, or -ę
• neuter nouns often have the same form in the nominative and accusative singular

That is one reason this sentence can look ambiguous at first.

Wzmacnia is:

• 3rd person singular
• present tense
• from the imperfective verb wzmacniać

So it matches a singular subject such as więzadło.

The basic pattern is:

• ja wzmacniam
• ty wzmacniasz
• on/ona/ono wzmacnia

Since więzadło is singular and neuter, the verb takes the same 3rd person singular form used with ono.

It can mean either, depending on context.

Polish does not have a separate grammatical form like English strengthens vs is strengthening in the present tense. The same form can cover:

• a general fact: strengthens
• something happening now: is strengthening
• a repeated action: does strengthen

In a scientific or anatomical sentence like this, it is most naturally understood as a general statement.

Because wzmacniać describes an action as ongoing, repeated, or general, rather than as a single completed result.

That is why it works well in definitions, descriptions, and scientific statements.

Its perfective partner is wzmocnić. But a perfective verb normally does not have a true present tense meaning in Polish. A form like wzmocni usually refers to the future: will strengthen.

So:

• wzmacnia = strengthens / is strengthening
• wzmocni = will strengthen

Yes, Polish word order is fairly flexible, but in this sentence you should be careful.

Because both nouns can look the same in nominative and accusative, word order helps the reader understand who is doing what.

The neutral order is:

• Więzadło wzmacnia staw.

If you reverse the nouns, many people will understand it as a different statement:

• Staw wzmacnia więzadło.

So in this particular sentence, word order matters more than in some other Polish sentences, because the case forms do not clearly separate subject and object.

Because Polish has no articles.

So Polish normally does not use separate words corresponding to English a/an or the. Whether the meaning is definite or indefinite is understood from context.

That means Więzadło wzmacnia staw could correspond to English expressions like:

• A ligament strengthens a joint
• The ligament strengthens the joint

The exact choice in English depends on context.

No. In Polish, subject pronouns are often omitted, especially when the subject is already expressed by a noun.

Since więzadło is already there, adding ono would be unnecessary.

Polish commonly says:

• Więzadło wzmacnia staw.

not:

• Ono wzmacnia staw. unless you want special emphasis

A basic plural version would be:

Więzadła wzmacniają stawy.

Here the forms change like this:

• więzadło → więzadła
• wzmacnia → wzmacniają
• staw → stawy

This is useful because it shows agreement:

• singular subject → singular verb
• plural subject → plural verb