Fig. 7

Imaging scores of synovitis are consistent with its pathological features from clinical synovial samples. A Preoperative X-ray and MRI examinations and intraoperative imaging of each group. B HE staining of synovial samples. C Imaging scores of synovitis. D Histologic scores of synovitis. E Univariate linear regression analysis of radiographic and histologic scores of synovitis. F Age distribution of patients. G BMI of patients. H Hemoglobin level of patients. HE, hematoxylin and eosin; BMI, body mass index; ^*P < 0.05, ^***P < 0.001 versus K–L Grade 2; ^#P < 0.05 versus K–L Grade 3