Tā zài shìgù zhōng sǔnshāng le liǎng kuài jǐzhuīgǔ.
He damaged two vertebrae in the accident.
Tips
memory
脊 (spine/back ridge) + 椎 (hammer; vertebra) + 骨 (bone). You can remember 椎 by imagining the vertebrae as a series of hammer-like segments stacked along your back.
