Series

Average score preoperative

Average score at the latest decline

Nich et al. [25]

11.7

16.2

Delaunay et al. [12]

11.1

17.4

Series P32 [24]

9.65

13.9

Courpied et al. [51]

10.1

17.1

Vidalain et al. [52]

10.9

17.4

Our series

9.1

16.1