Fig. 4A–C.

Images compare (A) nontreated cartilage, (B) ESWT-treated cartilage, and (C) intact cartilage at 10 weeks (stain, hematoxylin and eosin; original magnification, ×10). (A) The control knee shows larger denudation, few chondrocytes, increased fibrocartilage surface, and less mineralized cartilage (arrow). (B) The ESWT-treated knee shows close to normal cartilage structure with mild fissuring adjacent to the normal host bone site (white arrows) and normal subchondral bone healing and fusion (black arrow). (C) Intact cartilage shows normal-thickness cartilage with zones and subchondral bone structure (arrow).