Fig. 3

Forest plots showing the pain score measured by VAS and NRS at 2 to 3, 6, 12, and 24 months. a Comparison VAS and NRS during activity—2–3 months. b Comparison VAS and NRS during activity—6 months. c Comparison VAS and NRS during activity—12 months. d Comparison VAS and NRS during activity—24 months. e Comparison VAS and NRS during rest—12 months