It depends on the risk aversion of the skater. The skater will only practice less temporarily after the injury, unless the injury is career ending.
If the skater is risk averse, then the more a skater gets injured, the less he will practice, everything else equal.
The more a skater gets injured, the less risk that he will take, everything else equal.
But if the skater is risk loving and has a strong desire to win, then he will take risk, if not more risk, after his recovery, despite the injury he had in the past, as long as the risk is necessary for winning.
Did you ever see Hanyu take less risk because of injury or pain? (He did not even lower his tech after the COC collision. He still skated a layout equally as difficult as the layout he had in the olympic season.) He is going for much more risky layout this season, even after the injury he had las tseason. All of Yagudin, Plushenko, Lycasek and Hanyu are the same. They don't take less risk because of pain or injury. They take as much risk is needed in order to win. They only take less risk if the rules and the competitiveness of the field don't adequately compensate the risk and they can win with less risk.