Fig. 1

Patient Reported Outcome Measures of the recovery trajectory groups over time. A: EuroQol-5 Dimensions (EQ-5D-3L); B: Oxford Knee Score (OKS); C: pain at rest; D: pain during activity. Note: ^**, significant differences between groups at 3 months postoperative; ^***, significant differences between groups at 12 months postoperative; #, significant difference between No improvement group and Short improvement group; †, significant difference between No improvement group and Prolonged improvement group; ‡, significant difference between Short improvement group and Prolonged improvement group; ¤, significant difference between Short improvement group and Late improvement group; ¥, significant difference between Late improvement group and Prolonged improvement group; $, significant difference between No improvement group and Late improvement group