Table 1: Origin of cells by joint localization and type of specimen (SF for synovial fluid; SM for synovial membrane).

Localization Diagnosis group OA RA HC Elbow 0 1 (1 SF; 0 SM) 0 Finger or hand 0 3 (2 SF; 1 SM) 0 Hip 3 (0 SF; 3 SM) 2 (0 SF; 2 SM) 0 Knee 9 (5 SF; 4 SM) 4 (3 SF; 1 SM) 6 (0 SF; 6 SM) Total 12 (5 SF; 7 SM) 10 (6 SF; 4 SM) 6 (0 SF; 6 SM)