Is reattachment of a severed piece of flesh obligatory to remove?

Primary text

If a detached piece of human flesh is reattached, its removal is obligatory if the detached part is considered impure (najis). Removal is waived only if removal poses a risk of harm, similar to setting a broken bone with impure bone. If the detached part is considered pure, its removal is not obligatory. This latter view is the preferred position, held by Abu Bakr, 'Ata ibn Abi Rabah, and 'Ata al-Khurassani, because the human part remains pure in death as it was in life, thus retaining its purity as when it was attached.