<qa>  What was the cost of the trial?Barbed suture has been associated with improved closure efficiency and safety in TKA in prior studies. The investigators performed a multicenter randomized controlled trial to determine the efficiency and safety of this technology in TKA. The investigators prospectively randomized 411 patients undergoing primary TKA to either barbed running n191 or knotted interrupted suture closure n203. Closure time was measured intraoperatively. Cost analysis was based on suture and operating room time costs. 