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Table 1 Characteristics of included studies

From: Malalignment and malposition of quadriceps-sparing approach in primary total knee arthroplasty: a systematic review and meta-analysis

Study/year Country Total TKAs Follow-up (months) Prosthesis type Matchinga
   QS MP   QS MP  
Huang 2016 China 31 30 65 PS-F PS-F 1, 2, 3, 4, 5, 6, 7
Qi 2016 China 30 28 74.8 PS-F PS-F 1, 2, 3, 4, 7
Chiang 2012 Taiwan 38 37 24 PS-F PS-F 1, 2, 3, 4, 5, 6
Yang 2010 Korea 25 25 24 PS PS 1, 2, 3, 4, 6
Karpman 2009 USA 20 19 6 CR CR 1, 2, 3, 4, 6
Shen 2007 China 26 33 17 PS-F PS-F 1, 2, 3, 4, 6, 7
Huang 2007 Taiwan 32 35 24 PS-F PS-F 1, 2, 4, 6, 7
King 2007 USA 100 45 1.5 63PS/37PS-F 35CR/15PS 1, 2, 3, 4, 7
Kim 2007 Korea 120 120 21.5 PS PS 1, 2, 3, 4, 6
Chin 2007 Singapore 30 30 Unclear PS Depuy CS 1, 2, 3, 4
Tashiro 2007 Japan 24 25 14 PS-F 23PS/2PS-F 1, 2, 3, 4, 5, 6, 7
Chen 2006 USA 32 38 33 PS-F PS-F 1, 2, 3, 4, 6, 7
Kim 2006 Korea 144 144 13.6 PS PS 1, 2, 3, 4
  1. QS quadriceps-sparing, MP medial parapatellar, PS-F NexGen Legacy posterior stabilized-Flex prosthesis, PS NexGen Legacy posterior stabilized prosthesis, CR NexGen posterior cruciate-retaining prosthesis, Depuy CS Depuy PFC Sigma fixed-bearing cruciate-substituting prosthesis
  2. aMatching: 1 sex, 2 age, 3 BMI, 4 follow-up, 5 preoperative VAS, 6 preoperative range of motion, 7 preoperative knee deformity