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Table 1 General information of the selected 12 RCTs

From: No clear benefit or drawback to the use of closed drainage after primary total knee arthroplasty: a systematic review and meta-analysis

References TKAs (n) Gender (male:female) Mean age (years) Diagnosis Mean F/U Results
ND D ND D ND D ND D
Adalberth 1998 [17] 24 25 11:13 9:16 72 70 GA 4 m 4 m
Cao 2011 [6] 50 50 14:36 12:40 64.9 61.9 OA, RA 1y 1y +
Crevoisier 1998 [10] 16 16 UC UC 70 73 UC UC UC
Esler 2003 [11] 50 50 22:28 23:27 72.1 73.1 OA, RA 5y 5y +
Fan 2013 [5] 40 40 16:24 16:24 66.5 66.5 OA 30d 30d
Holt 1997 [16] 68 69 20:48 24:45 69 70 UC 6w 6w +
Jenny 2001 [9] 30 30 UC UC 70 70 GA UC UC
Kim 1998 [3] 69 69 7:62 7:62 64 64 OA, RA 16 m 16 m +
Liu 2014 [7] 6 12 1:5 3:9 67.2 67.2 OA 4w 4w +
Niskanen 2000 [8] 19 20 5:14 4:16 71 70 OA 2 m 2 m
Omonbude 2010 [2] 38 40 23:15 20:20 68.4 71.1 OA 6w 6w +
Ovadia 1997 [4] 26 32 6:20 7:25 69.7 73.7 OA, RA, AN UC UC +
  1. Abbreviations: ND nondrainage group, D closed drainage group, F/U follow-up, UC unclear, GA gonarthrosis, OA osteoarthritis, RA rheumatoid arthritis, AN avascular necrosis, d day, w week, m month, y year, + differences were found between the groups, − no difference was found between the groups