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

Table 1 General information of the selected 12 RCTs

References	TKAs (n)		Gender (male:female)		Mean age (years)		Diagnosis	Mean F/U		Results
References	ND	D	ND	D	ND	D	Diagnosis	ND	D	Results
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	+

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

ISSN: 1471-2474