Fig. 2
From: Procaine and saline have similar effects on articular cartilage and synovium in rat knee
The articular cartilage of the knee joints. Intact cartilage surfaces without erosion at all time intervals in both saline (a–e) and procaine (f–j) administered groups. TZ: Tangential zone, IZ: Intermediate zone, RZ: Radial zone, Cc: Calcified cartilage, SB: Subchondral bone, White arrows: Tidemark, Black arrow: Hypertrophied chondrocytes. a–e show saline-administered groups, and f–j show procaine-administered groups. Haematoxylin and eosin, Scale bar: 50 μm