Table 1. Characteristics of included studies.

Study-year	Year	Country	Group	Age	BMI	Patients	Male	Female	Total TKA	Follow-up
Chin	2007	Singapore	Mini-MV	67.4 (56–80)	28.50(22.1–40.0)	30	6	24	30	3 months
			MP	69.0 (57–80)	27.5 (18.6–34.2)	30	3	27	30
Cho	2013	Korea	Mini-MV	65.5±5.1	29.1±3.9	33	1	32	33	1 year
			MP	67.0±5.7	28.0±4.1	33	2	31	33
Dalury	2008	USA	Mini-MV	67 (53–86)	30 (23.6–39)	20	6	14	20	3 months
			MP						20
Fu	2008	China	Mini-MV	67 (53–86)	30 (23.6–39)	34	7	27	34	3 months
			MP						34
Guy	2012	UK	Mini-MV	71.2	28.2±3.0	40	38	42	40	1 year
			MP	69.1	28.9±3.8	40			40
Heekin	2013	USA	Mini-MV	65.13±6.49	30.98±5.44	40	26	14	40	2 years
			Mini-MP						40
Hernandez-Vaquero	2010	Spain	Mini-MV	70.8±5.9	32.1±6	26	5	21	26	6 months
			MP	70.5±6.9	30.8±3.3	36	6	30	36
Juosponis	2009	Lithuania	Mini-MV	72±5.5	27.95±3.2	35	5	30	35	3 months
			MP	71.4±5.04	29.08±2.7	35	5	30	35
Karachalios	2008	Greece	Mini-MV	71.1 (52–78)	32 (27–35)	50	19	31	50	3 years
			MP	70.8 (54–77)	31.5 (28–35)	50	15	35	50
Karpman	2009	USA	Mini-MV	74±7.7	30±7.3	20	7	13	20	6 months
			MP	73±5.1	29±4.6	19	9	10	19
Kim	2011	Korea	Mini-MV	67±6	27.1±3	23	0	23	23	1 year
			MP	68±7	28.4±5	22	0	22	22
Kolisek	2007	USA	Mini-MV	67 (48–84)	32 (19–49)	40	29	11	40	3 months
			MP	70 (54–79)	30 (20–40)	40	24	15	40
Lee	2011	Korea	Mini-MV	67 (54–73)	27.5 (23.1–33.8)	30	2	28	30	6 months
			MP						30
Nestor	2010	USA	Mini-MV	66.7±9.6	29.6±5.6	27	9	18	27	6 months
			MP						27
Pongcharoen	2013	Thailand	Mini-MV	67±4.9	27±2.4	30	5	25	30	1 year
			MP	67±6.0	26±2.3	30	7	23	30
Varnell	2011	Italy	Mini-MV	75±7	29.5±4.59	20	6	14	20	6 months
			Mini-SV	71±6	30.96±6.16	18	11	7	20
Walter	2007	USA	Mini-MV	71.5 (53–85)	31.8 (26.2–43.9)	25	6	19	25	3 months
			MP	66.6 (50–80)	34.8 (22.3–59.4)	19	7	12	19
Zhang	2013	China	Mini-MV	62.6 (48–70)	24.8 (19.6–29.4)	45	14	31	45	6 months
			MP	63.7 (47–74)	24.4(19.2–28.6)	44	14	30	44

*.Mini-MV =  mini-midvastus, MP =  medial parapatellar, NR =  not report