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Table 1 Characteristics of included studies

From: Quadriceps-sparing versus traditional medial parapatellar approaches for total knee arthroplasty: a meta-analysis

Study/Year Country Recruitment period Group Patients (male/female) Number of TKAs Age (year) BMI (kg/m2) Follow-up (months) Results Favor
Huang 2016 China 2005–2007 QS 2/29 31 69.3 ± 7.9 26.9 ± 3.3 65 ± 3.8 QS
MP 2/28 30 71.2 ± 5.8 26.7 ± 2.8 68 ± 5.4
Qi 2016 China 2005–2007 QS 2/26 30 65.3 ± 6.9 26.5 ± 3.0 74.8 QS
MP 2/24 28 64.0 ± 5.7 28.1 ± 4.1 74.8
Lin 2013 Taiwan 2007–2008 QS 5/30 35 67.7 (60, 78) 26.3 (21.2, 29.7) 24 MP
MP 5/30 35 68.5 (55, 77) 25.9 (20, 29.5) 24
Xu 2013 China 2009–2010 QS 7/19 35 63.5 ± 8.7 25.2 ± 3.4 24 QS
MP 11/18 35 64.2 ± 9.3 25.2 ± 2.3 24
Chiang 2012 Taiwan 2005 QS 3/27 38 69.7 ± 5.3 28.6 ± 3.8 24 MP
MP 3/27 37 69.8 ± 5.4 29.6 ± 3.5 24
Matsumoto 2011 Japan 2005–2007 QS 0/25 25 73.8 ± 1.7 Unclear 0 MP
MP 0/25 25 73.7 ± 1.4 Unclear 0
Yang 2010 Korea 2006–2007 QS 1/14 24 66.7 ± 6.9 Unclear 24 MP
MP 2/14 23 68 ± 6.8 Unclear 24
Karpman 2009 USA 2004–2005 QS 8/12 20 73 ± 7.4 28 ± 4.4 6 QS
MP 9/10 19 73 ± 5.1 29 ± 4.6 6
Chotanaphuti 2008 Thailand 2004–2005 QS 3/17 20 68.4 (58, 78) Unclear 0.25 QS
MP 4/16 20 67.5 (56, 80) Unclear 0.25
Shen 2007 China 2005–2006 QS Unclear 26 Unclear Unclear 17 QS
MP Unclear 33 Unclear Unclear 17
Huang 2007 Taiwan 2004–2005 QS 6/26 32 63 (56, 72) Unclear 24 MP
MP 7/28 35 65 (59, 75) Unclear 24
King 2007 USA 2003–2005 QS 48/52 100 67 (44, 84) 30 (22, 43) 1.5 QS
MP 17/28 45 66 (42, 85) 32 (20, 49) 1.5
Kim 2007 Korea 2004–2005 QS 27/93 120 65.4 (43, 88) 28.1 (19, 36) 21.5 MP
MP 27/93 120 65.4 (43, 88) 28.1 (19, 36) 21.5
Chin 2007 Singapore 2004 QS 6/24 30 69.0 (57, 80) 27.53 (18.6, 34.2) Unclear MP
MP 3/27 30 63.4 (47, 80) 29.44 (22.7, 40) Unclear
Chen 2006 USA Prior to 2002 QS 11/17 32 70 (50, 86) 28.5 (17.9, 39.9) 33 MP
MP 11/18 38 67 (42, 81) 28.7 (21.6, 40.1) 40
Kim 2006 Korea 2003 QS 7/65 144 68.6 (57, 85) 27.2 13.6 MP
MP 8/64 144 67.4 (58, 84) 28.1 13.6
  1. TKA total knee arthroplasty, BMI body mass index, QS quadriceps-sparing, MP medial parapatellar