How can a Muslim pray if he is unable to bow for rukoo' and prostrate for sujood due to back pain resulting from an accident?

A hemorrhoid patient should pray standing if able. If unable, then sitting. If still unable, then lying on their side. Bowing (rukūʿ) and prostration (sujūd) are waived if one is unable to perform them, and one should gesture for them, making the prostration gesture lower than the bowing gesture. If one is unable to even gesture, they should pray according to their condition, and the bowing and prostration will be by intention, along with reciting the prescribed remembrance (adhkār).