Saat jatuh di lapangan, siku dan telapak tangan saya kena tanah.

Saat means when or at the time when. Here it introduces the time clause.

A few near-synonyms are:

• saat — when, fairly neutral
• ketika — when, a bit more formal/literary
• waktu — when/time, very common
• pas — when/just as, more casual

So Saat jatuh di lapangan, ... means When falling on the field, ... or more naturally When I fell on the field, ...

It can say saat saya jatuh, and that is perfectly correct.

But Indonesian often omits a subject when it is already obvious from context. In this sentence, the later saya makes it clear that the person falling is I / me, so saat jatuh is understood as when I fell.

Compare:

• Saat saya jatuh di lapangan, ... — explicit
• Saat jatuh di lapangan, ... — subject omitted because it is understood

This kind of omission is very common in natural Indonesian.

Jatuh means to fall.

In this sentence it refers to the event of falling. Indonesian verbs do not change form for tense the way English verbs do, so jatuh can correspond to:

• fall
• fell
• falling

depending on context.

Here, because of the whole sentence and its meaning, it is understood as something like fell or when falling.

Yes, you could, but it changes the nuance a little.

• jatuh — fall
• terjatuh — fall accidentally / end up falling

Terjatuh often sounds a bit more formal or emphasizes that it happened unintentionally.

So:

• Saat jatuh di lapangan, ... — natural, simple
• Saat terjatuh di lapangan, ... — also possible, with more emphasis on the accidental fall

In everyday speech, jatuh is very common.

Di is a preposition meaning in, on, or at, depending on context.

Lapangan usually means an open field, court, or ground, often for sports or outdoor activity.

So di lapangan means something like:

• on the field
• at the मैदान/ground
• on the court

The most natural English choice depends on the situation.

Siku means elbow.

It is just the body-part noun by itself. Indonesian does not need an article, so siku can mean an elbow or the elbow, depending on context.

Because telapak tangan is more specific.

• tangan = hand
• telapak tangan = palm of the hand / palm

So if the sentence wants to say that the palms touched the ground, telapak tangan is the right choice.

If it said only tangan, that would mean hands more generally, not specifically the palms.

By itself, it can be either singular or plural. Indonesian nouns usually do not change form for number.

So telapak tangan can mean:

• palm
• palms

The context tells you which one is meant. In this sentence, it will usually be understood as the palms of my hands or my palms, even though there is no separate plural marker.

Because Indonesian possessives normally come after the noun.

So:

• tangan saya = my hand
• siku saya = my elbow

In this sentence, saya comes after the whole noun phrase:

• siku dan telapak tangan saya

This naturally means my elbow and palms / my elbow and the palms of my hands.

In Indonesian, a possessive placed after a coordinated phrase can apply to the whole phrase, not just the last noun.

In theory, someone analyzing it very strictly might wonder about that, because saya comes after the last noun. But in normal usage, the intended meaning is very clear: the possessive applies to the whole body-part phrase.

So native speakers will understand it as referring to my elbow and my palms, not as some strange contrast where only the palms belong to me.

If someone wanted to be extra explicit, they could say:

• siku saya dan telapak tangan saya

But that is less natural here because it repeats saya unnecessarily.

Here kena means something like:

• to get hit by
• to come into contact with
• to hit
• to touch accidentally

So kena tanah means the elbow and palms hit the ground or came into contact with the ground.

This is a very common everyday use of kena in Indonesian.

They are similar, but not identical in style.

• kena — common, conversational, everyday
• mengenai — more formal, more standard/written-sounding in many contexts

So:

• siku saya kena tanah — very natural in speech
• siku saya mengenai tanah — correct, but more formal or stiff in everyday conversation

In casual spoken Indonesian, kena is often the more natural choice.

Because with kena, the thing contacted is usually stated directly, without ke.

So:

• kena tanah — correct
• kena dinding — correct
• kena meja — correct

But ke is used more for direction or movement toward something, as in:

• jatuh ke tanah — fall to the ground

So:

• jatuh ke tanah = movement toward the ground
• kena tanah = contact with the ground

They express different parts of the event.

Not in the same way as Indonesian di- passives.

It does have a kind of affected meaning: the subject experiences contact from something or ends up in contact with something. But grammatically, it is not the regular passive pattern like:

• dipukul = was hit
• ditendang = was kicked

So siku saya kena tanah is more like my elbow hit/got in contact with the ground, using a very natural colloquial verb.

Yes. A more formal or careful version could be:

• Saat saya jatuh di lapangan, siku dan telapak tangan saya mengenai tanah.

That version is more explicit because it includes saya before jatuh and uses mengenai instead of kena.

The original sentence, though, sounds natural and normal in everyday Indonesian.

Because Indonesian works differently from English.

A few key points:

• Indonesian has no articles like a, an, or the
• possession is shown by putting the pronoun after the noun:
  tangan saya = my hand
• plurality is often left unstated unless it matters

So a lot of information that English marks with articles and plural forms is simply left to context in Indonesian. That is completely normal.