<qa>  What was the hypothese of a prospective study?The investigators hypothesized that a prospective study would show that barbed sutures would be more efficient, have comparable complication rates, clinical outcomes, and cosmesis outcomes versus traditional knotted sutures when used in the closure of primary TKA. Specifically, the investigators hypotheses were as follows: multilayered closure in TKA with barbed suture would be associated with 1 shorter closure times; 2 lower cost; 3 similar closure related perioperative complication rates; and 4 similar Knee Society, cosmesis, and patient satisfaction scores when compared to standard knotted suture closure. 