2 sentences

1. 我想我的背摔伤了。

   wǒ xiǎng wǒ​de bèi shuāi shāng le.

   I think I hurt my back.

   Source: OpenSubtitles

2. 真不幸，我在冰上摔倒时摔伤了膝盖。

   zhēn bù​xìng, wǒ zài bīng shang shuāi dǎo shí shuāi shāng le xī​gài.

   Unfortunately, I hurt my knee when I fell down on the ice.

   Source: UM-Corpus: Education