This is the 4504th most frequent Polish word.
kontuzji
"Injury" (genitive singular form in Polish).
The word 'kontuzja' here is used as a noun to denote a physical injury or harm, relevant in a sporting or physical context.
Powodem mojej nieobecności na meczu była kontuzja.
The reason for my absence from the match was an injury.
In this sentence, 'kontuzji' is in the genitive case, indicating possession or relation, describing the type of injury acquired.
Podczas treningu nabawiłem się kontuzji kolana.
During the practice, I sustained a knee injury.
Here, 'kontuzji' appears in the genitive case as part of the prepositional phrase, specifying the context of the rehabilitation being referred to.