Celecoxib and indomethacin reduced the percentage of impact-induced apoptotic chondrocytes following an impact load. Following loading (as described in Figure 3) and culture in the presence of celecoxib and indomethacin for 6 days, the percentage of apoptotic cells in frozen sections (8 μm) of articular cartilage explants was measured using the TUNEL assay. Mean values (± standard deviation, n = 12). Asterisks denote significant differences between the groups as shown. (*p ≤ 0.05).