פיזיותרפיה יכולה להקל על כאב מפרקים.

A common pronunciation is:

fizyoterápya yekholá lehakél al ke'év mifrakím

Stress usually falls like this:

• פיזיותרפיה → fi-zyo-te-RA-pya
• יכולה → ye-kho-LA
• להקל → le-ha-KEL
• כאב → ke-EV
• מפרקים → mif-ra-KIM

A rough English-friendly version would be:
fee-zyo-teh-RA-pya yeh-kho-LA leh-ha-KEL al keh-EV mif-ra-KEEM

Because פיזיותרפיה is a feminine singular noun in Hebrew.

The word יכול / יכולה agrees with the subject:

• הוא יכול = he can
• היא יכולה = she can / it can
• הטיפול יכול = the treatment can
• הפיזיותרפיה יכולה = the physiotherapy can

So since פיזיותרפיה is feminine, Hebrew uses יכולה.

Here יכולה means can or is able to.

Hebrew often uses forms of יכול to express ability:

• אני יכול/ה = I can
• אתה יכול = you can
• היא יכולה = she can
• פיזיותרפיה יכולה = physiotherapy can

So the structure is very similar to English:
subject + can + verb

After יכול / יכולה, Hebrew normally uses the infinitive of the main verb.

So:

• יכולה להקל = can ease / can relieve
• יכול לעזור = can help
• יכולה לשפר = can improve

The infinitive usually begins with ל־:

• להקל = to ease / to relieve
• לעזור = to help
• לשפר = to improve

So יכולה להקל literally means is able to relieve.

This is an important fixed pattern:

• להקל על משהו = to ease / relieve something
• literally, it is built with the preposition על

So in Hebrew you say:

• להקל על הכאב = to ease the pain
• להקל על לחץ = to reduce stress / ease stress
• להקל על העומס = to lessen the burden/load

Even though English says ease pain without a preposition, Hebrew usually says להקל על...

So על is not optional here; it belongs to the verb pattern.

It means joint pain, literally something like pain of joints.

This is a common Hebrew noun combination where one noun modifies another:

• כאב ראש = headache
• כאב בטן = stomachache
• כאב מפרקים = joint pain

So:

• כאב = pain
• מפרקים = joints

Together they function like one idea: joint pain.

Hebrew often connects nouns directly without using של when forming a tight expression.

Compare:

• כאב מפרקים = joint pain
• כאב של המפרקים = pain of the joints

The version without של is usually more compact and more natural for set medical-style expressions.

So כאב מפרקים sounds like a category or condition, while כאב של המפרקים sounds more explicitly descriptive.

Because the sentence is speaking generally, not about one specific pain or one specific physiotherapy treatment.

• פיזיותרפיה יכולה להקל על כאב מפרקים.
  = Physiotherapy can ease joint pain.
  General statement.

If you wanted to refer to something specific, you might say:

• הפיזיותרפיה יכולה להקל על כאב המפרקים.
  = The physiotherapy can ease the joint pain.

But for a general fact, Hebrew often leaves things indefinite, just like English often does.

Not necessarily. You may also hear other expressions, depending on style and nuance, such as:

• כאבי מפרקים = joint pains / joint pain
• כאב במפרקים = pain in the joints

These are all understandable, but they are not identical in feel:

• כאב מפרקים = a compact expression for joint pain
• כאבי מפרקים = very common in medical or everyday usage
• כאב במפרקים = focuses on the location, pain in the joints

So the sentence you were given is correct, but Hebrew may offer more than one natural way to express the same idea.

The singular is מפרק = joint.

So:

• מפרק = joint
• מפרקים = joints

Examples:

• כאב במפרק = pain in a joint
• כאב במפרקים = pain in the joints

Yes. The word order is very natural:

• פיזיותרפיה = subject
• יכולה = can
• להקל = relieve
• על כאב מפרקים = on joint pain / joint pain

So the structure is:

Subject + modal + infinitive + prepositional phrase

This is a very common Hebrew sentence pattern.

Often, yes: nouns ending in ־יה are very often feminine, and פיזיותרפיה is treated as feminine in standard Hebrew.

That is why you say:

• פיזיותרפיה טובה = physiotherapy is good
• פיזיותרפיה יעילה = physiotherapy is effective
• פיזיותרפיה יכולה = physiotherapy can

So even though it is a borrowed/international word, it still follows normal Hebrew gender agreement.