Renalson won medals in weightlifting at all four Paralympics from 1964 to 1976: a silver medal in the Men's Heavyweight event at the 1964 Tokyo Games, a gold medal in the Men's Heavyweight event at both the 1968 Tel Aviv and 1972 Heidelberg Games, and a gold medal in the Men's Middleweight event at the 1976 Toronto Games. He participated in athletics at three Paralympics from 1968 to 1976; in 1968 he won two gold medals in the Men's Club Throw A and Men's Discus A events, a silver medal in the Men's Javelin A event, and a bronze medal in the Men's Shot Put A event, and in 1972 he won a silver medal in the Men's Discus 3 event and a bronze medal in the Men's Precision Javelin open event.