“…There were 19 case series [2, 4-6, 9-12, 16, 17, 19, 20, 27, 32, 33, 35, 37, 38, 41], two retrospective comparative studies [1, 23], three prospective comparative studies [21, 25, 30], and two randomized controlled trials [26, 31]. Twenty-one studies evaluated TKA [1, 4-6, 9-11, 16, 17, 19-21, 23, 25, 26, 30-33, 37, 41] and five evaluated UKA [2, 12, 27, 35, 38] (Table 1). Across the 21 TKA studies, 3095 knees were included, with 601 men and 913 women (1088 unreported), a mean age of 49.2 ± 4.3 years, and a mean postoperative follow-up ranging from 1.0 to 25.1 years.…”