Inclusion Criteria:  Diagnosis of chronic rhinosinusitis defined as symptomatic inflammation of the sinuses of at least 12 consecutive weeks duration despite medical management CT scan examination with a minimum Zinreich score of 5 prior to study entry Less than 2-point Zinreich score difference between two sides Primary FESS including bilateral total ethmoidectomy; symmetrical uncinate process reduction  Exclusion Criteria:  Inferior turbinectomy, reduction or outfracture Polyp grade ˃ 4 bilaterally on Lildholdt's scale (1-3) Concha bullosa Severe nasal septal deviation at the level of OMC Sinonasal tumors FESS including asymmetrical resection of the middle turbinate Known allergy to nickel Known polyurethane induced dermatitis Oral steroid-dependent condition Momometasone furoate intolerance Known hypersensitivity to lactide, glycolide or caprolactone copolymers. Glaucoma or cataract History of immune deficiency Cystic fibrosis Pregnant or lactating female Acute sinus inflammation Coagulation disorders