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Table 1 The characteristics of the included studies

From: Arthroscopic wafer procedure versus ulnar shortening osteotomy for ulnar impaction syndrome: a systematic review and meta-analysis

Study ID

Study design

Country

Case

Sex (M/F*)

Age (year)

Affected hand (L/R*)

Follow-up (months)

AWP

USO

AWP

USO

AWP

USO

AWP

USO

AWP

USO

Bernstein 2004

RCS

USA

11

16

6/5

8/8

24–61

19–65

UA*

UA

7–61

7–58

Constantine 2000

RCS

USA

11

11

5/6

3/8

46

35

UA

UA

26

46

Auzias 2020

RCS

France

24

9

UA

UA

44.4 ± 12

39.1 ± 4

UA

UA

55 + − 4

103 ± 8

Oh 2018

RCS

Korea

19

23

8/11

9/14

53.8 ± 7.0

53.5 ± 6.6

14/5

10/13

34.6 ± 12.0

36.2 ± 11.6

Teng 2020

RCT

China

19

23

13/6

16/7

UA

UA

7/12

8/15

14.61 ± 2.19

14.61 ± 2.19

Chen 2020

RCS

China

22

23

13/9

13/10

38.4 ± 9.5

37.3 ± 7.1

6/16

6/17

13.7

14.3

Smet 2014

RCS

Belgium

12

28

8/4

22/6

31–66

16–61

UA

UA

UA

UA

Afifi 2022

RCT

Egypt

30

30

18/12

26/4

UA

UA

4/26

10/20

22 ± 5.7

21.1 ± 5.3

  1. AWP * means arthroscopic wafer procedure
  2. USO* means ulnar shortening osteotomy
  3. M/F* means male/female
  4. L/R* means left/right
  5. UA* means data are unavailable
  6. RCT* means Randomized Controlled Trials
  7. RCS* means Retrospective Cohort Study