Fig. 4From: Increasing comorbidity is associated with worsening physical function and pain after primary total knee arthroplastyX-axis shows both pre-operative and the post-operative periods since TKA, including the baseline post-operative score at 6–12 months post-index TKA and the subsequent 12–24 month intervals. The Y-axis shows WOMAC pain and physical function (PF) subscale scores and SF-36 PF and bodily pain (BP) subscale scores, which are out of 100 points. On WOMAC, 0 is the best score and 100, the worst score; on SF-36, 0 is the worst and 100, the best scoreBack to article page