Patients with a good HAQ score but low gait speed were significantly older and had significantly lower body height, longer duration of RA disease, higher disease activity score (DAS28-CRP and CDAI), higher TJC, higher pVAS, higher CRP, higher rate of interstitial lung disease and lower knee extension strength than patients with a good HAQ score and normal gait speed. Here, CRP is linked to interstitial lung disease.