Corrigendum

Figures & data

Table 1. The characteristics of included studies.

Study	Year	Country	Patients (n)		Age (Y)		Gender				Study design	Quality scores
			Prehabilitation	control	Prehabilitation	control	Prehabilitation		control
							M	F	M	F
Beaupre	2004	Canada	65	66	67±7	67±6	26	39	33	33	RCT	5
Cavil	2015	Australia	21	20	66.0±8.4	68.3±9.1	10	11	9	11	RCT	7
Evgeniadis	2008	Greece	18	20	67.1±4.4	69.4±1.9	3	15	6	14	RCT	5
Gstoettner	2010	Austria	18	20	72.8±15.7	66.9±12.6	2	16	6	14	RCT	5
Huang	2012	China	126	117	69.8±7.2	70.5±7.4	38	88	31	86	RCT	3
Matassi	2012	Italy	61	61	66±7.2	67±7.7	28	33	35	26	RCT	4
McKay	2012	England	10	12	63.5±4.93	60.58±8.05	5	5	5	7	RCT	5
Mitchell	2004	England	57	57	70.0±7.2	70.6±8.2	21	36	27	30	RCT	7
Rooks	2006	England	22	23	65±8	69±8	11	11	10	13	RCT	4
Shurky	2016	Malaysia	24	26	62.4	64.3	2	22	5	21	RCT	5
Skoffer	2016	Danmark	30	29	70.7±7.3	70.1±6.4	11	19	12	17	RCT	7
Topp	2009	American	26	28	64.1±7.05	63.5±6.68	7	19	10	18	RCT	3
Tungtrongjit	2012	Thailand	30	30	63±7.6	65.9±7.2	4	26	6	24	RCT	7
Walls	2010	Ireland	9	5	64.4 ± 8.0	63.2 ± 11.4	3	6	1	4	RCT	5
Williamson	2007	England	60	61	70±8.79	69.6±10	29	31	28	33	RCT	7

Table 2. Characteristics of the sixteen trials selected showing general intervention information.

	Prehabilitation	Control	Outcome
Beaupre	4-week exercise/education program	Usual care	Length of hospital stay, Knee ROM, WOMAC pain, WOMAC stiffness, WOMAC function, Quadriceps strength (3 months after TKA)
Cavill	One-hour twice-weekly sessions for at least three and a maximum of four weeks prior to TKA	Usual care	Knee flexion, Knee extension (8 weeks after TKA)
Evgeniadis	A general strengthening exercise program for 3 weeks prior to TKA	Usual care	Knee flexion, knee extension (ten weeks after TKA)
Gstoettner	6 weeks of preoperative proprioceptive training	Usual care	WOMAC function, WOMAC pain, WOMAC stiffness (6 weeks after TKA)
Huang	40-min preoperative home Rehabilitation education program 4 weeks prior to TKA	Usual activities and exercise	Length of hospital stay
Matassi	6-week home-based exercise program prior to TKA	Usual care	Length of hospital stay
McKay C	A 10-minute aerobic warm-up, followed by a circuit of bilateral lower body exercises, 3 times per week for 6 weeks before TKA	A 10-minute aerobic warm-up, followed by a circuit of bilateral upper body exercises, 3 times per week for 6 weeks before TKA	Quadriceps strength,WOMAC pain, WOMAC function (12 weeks after TKA)
Mitchell	Pre-operative physiotherapy and post-discharge	Post-discharge	WOMAC function, WOMAC pain, WOMAC function (12 weeks after TKA)
Rooks	6-week exercise prior to surgery	6-week education prior to surgery	WOMAC function, WOMAC pain (8 weeks after TKA)
Malaysia	Physical exercises for six weeks prior to TKA	Usual care	Knee ROM (3 months after TKA)
Skoffer	4 weeks of preoperative and 4 weeks of postoperative progressive resistance training	4 weeks of postoperative progressive resistance training	Sit-to-stand test, 6-minute walk, knee extension, knee flexion (2 months after TKA)
Topp	Prehabilitation exercises, 3 times per week prior to TKA	Usual care	Sit-to-stand, 6 minute walk, quadriceps strength (3 months after TKA)
Tungtrongjit	Three weeks home quadriceps strengthening exercise program prior to TKA	Usual activities	WOMAC pain, WOMAC stiffness, WOMAC function, Quadriceps strength, Knee ROM, Knee Flexion, Knee extension (3 months after TKA)
Walls	8 weeks of preoperative unsupervised, home-based neuromuscular electrical stimulation training	Standard preoperative care	WOMAC function, WOMAC pain, WOMAC stiffness (12 weeks after TKA)
Williamson	Physiotherap, hourly, once a week for 6 weeks	Usual exercise	Length of hospital stay

Figure 1. Flow chart showing study identification, inclusion and exclusion.

Figure 2. Risk of bias summary.

Figure 6. Forest plot of 6-minute walk when compared prehabilitation exercise group with control group.

Figure 8. Forest plot of knee extension when compared prehabilitation exercise group with control group.

Figure 9. Forest plot of knee flexion when compared prehabilitation exercise group with control group.