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Table 1 Identified observational studies reviewed for design and quality

From: Total knee arthroplasty after high tibial osteotomy. A systematic review

   Design   Quality assessment
  study Year Deeks classification Deeks tool Minors list
1 van Raaij [11] 2007 concurrent cohort (5) 9 8
2 Haslam [4] 2007 concurrent cohort (5) 8 7
3 Huang [16] 2002 concurrent cohort (5) 7 7
4 Karabatsos [17] 2002 concurrent cohort (5) 7 7
5 Meding [18] 2000 concurrent cohort (5) 8 7
6 Haddad [19] 2000 concurrent cohort (5) 8 7
7 Nizard [20] 1998 concurrent cohort (5) 8 7
8 Amendola [21] 1998 concurrent cohort (5) 6 6
9 Mont [22] 1994 concurrent cohort (5) 7 8
10 Parvizi [5] 2003 concurrent cohort (5) 5 9
11 Walther [23] 2000 concurrent cohort (5) 4 4
12 Toksvig-Larsen [24] 1998 concurrent cohort (5) 6 4
13 Bergenudd [25] 1997 concurrent cohort (5) 6 5
14 Gill [26] 1995 concurrent cohort (5) 5 4
15 Jackson [27] 1994 case-control (7) 3 2
16 Windsor [6] 1988 historical cohort (6) 3 4
17 Katz [28] 1987 concurrent cohort (5) 5 6
  1. Those articles were selected with high quality on both instruments (≥ 50% or ≥ 6 points)