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Table 1 Characteristics of included studies

From: Comparison of the quadriceps-sparing and subvastus approaches versus the standard parapatellar approach in total knee arthroplasty: a meta-analysis of randomized controlled trials

Study-year Country Group Patients (male/female) Total TKA Age BMI Follow-up Results favoring
Chiang 2012 China QS 30 (3/27) 38 69.7 ± 5.3 28.6 ± 3.8 2 years MP
SP 30 (3/27) 37 69.8 ± 5.4 29.6 ± 3.5
Karpman 2009 America QS 20 (8/12) 20 73 ± 7.4 28 ± 4.4 6 months QS
SP 19 (9/10) 19 73 ± 5.1 29 ± 4.6
Kim 2007 Korea QS 120 (27/93) 120 65.4 (43–88) 28.1 (19–36) 2 years MP
SP 120 (27/93) 120
Lin 2009 China QS 30 (3/27) 40 69.6 (57–78) 28.1 (20.1–36.9) 2 month N.S
SP 30 (3/27) 40 70.2 (56–82) 29.0 (20.1–36.9)
Lin 2013 China QS 35 (5/30) 35 67.7 ± 5 26.3 ± 2.5 2 years QS
SP 35 (5/30) 35 68.5 ± 5.5 25.9 ± 2.6
Matsumoto 2011 Japan QS 25 (0/25) 25 73.8 ± 1.7 Not reported 1 week QS
SP 25 (0/25) 25 73.7 ± 1.4 Not reported
Shen 2007 China QS 26 (−/−) 26 Not reported Not reported 12 years QS
SP 33 (−/−) 33 Not reported Not reported
Tasker 2013 United Kingdom QS 46 (17/29) 46 67.3 ± 8.4 Not reported 2 years QS
SP 46 (17/29) 46 68.2 ± 7.5 Not reported
Xu 2013 China QS 26 (7/19) 35 63.5 ± 8.7 25.2 ± 3.4 3 months QS
SP 29 (11/18) 35 64.2 ± 9.3 25.2 ± 2.3
Roysam 2001 United Kingdom SV 46 (25/21) 46 70.2 Not reported 3 months SV
SP 43 (22/21) 43 69.8 Not reported
Weinhardt 2004 German SV 26 (19/7) 26 69.7 ± 9.1 Not reported 13 days N.S
SP 26 (14/12) 26 73.7 ± 6.8 Not reported
Bridgman 2009 United Kingdom SV 116 (60/56) 116 70.1 ± 8.0 Not reported 1 year SV
SP 115 (59/56) 115 70.9 ± 8.1 Not reported
Sastre 2009 Spain SV 56 (not reported) 56 NR Not reported 1 year SV
SP 48 (not reported) 48 Not reported Not reported
Pan 2010 China SV 35 (11/24) 35 62.5 (54–70) 24.8 (19.5–28.6) 18 months N.S
SP 33 (9/24) 33 63.2 (50–75) 24.6 (19.4–28.2)
Varela-Egocheaga Spain SV 50 (14/36) 50 68.02 ± 8.14 30.97 ± 5.25 3 years SV
SP 50 (13/37) 50 70.64 ± 7.88 30.62 ± 3.42
Van Hemert 2010 Netherlands SV 20 (6/14) 20 70.3 ± 11.8 29.2 ± 5.5 3 months N.S
SP 20 (7/13) 20 70.9 ± 7.1 30.3 ± 5.9
Varnell 2011 Italy SV 18 (11/7) 20 71 ± 6 30.96 ± 6.16 6 months MP
SP 15 (5/10) 18 70 ± 7 28.15 ± 4.2
Wegrzyn 2013 USA SV 18 (4/14) 18 71 ± 6 30.96 ± 6.16 2 months N.S
SP 18 (4/14) 18 70 ± 7 28.15 ± 4.2
Jain 2013 India SV 50 (12/38) 50 67 ± 8 30 ± 6 2 weeks SV
SP 50 (12/38) 50 64 ± 7 31 ± 4
  1. BMI body mass index, SV subvastus, SP standard parapatellar, QS quadriceps-sparing, N.S not significant
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