All-Star Julius Randle, who suffered left ankle sprains before and during a disappointing playoff run, underwent arthroscopic surgery on that same ankle Friday and will resume basketball activities before training camp. Randle missed five regular season games and one in the playoffs because of the ankle sprains. He played through the pain in series against Cleveland and Miami, but the 28-year-old’s production was well below his standards. After the Knicks were eliminated in six games by the Heat, Randle declined to say whether he was hampered by the ankle injuries. “No, I’m not one to make excuses,” he said. Before the first ankle sprain, Randle played every game and averaged 25.1 points, 10 rebounds, 4.1 assists and 2.8 turnovers while shooting 46% overall and 34.3% on 3-pointers.