Patients with chronic rhinosinusitis with polyposis who were to undergo basic sinus surgery ( antrostomy , ethmoidectomy , and polypectomy ) were randomized to either debridement ( at postoperative weeks 2 and 4 ) or no debridement , and their outcomes were assessed at 4 weeks and at 6 months with the Lund-Kennedy Endoscopic Score ( LKES ) , the Sino-Nasal Outcome Test-21 ( SNOT-21 ) , a visual analog scale for postoperative pain , and a novel scoring system for postoperative inconvenience ( Post-Operative Inconvenience Scale ; POIS ) .