Late to the party here, but you can do both ROM and icing and elevation. Just alternate. Relieving the pain of tight band will help maintain. Just left my best friend who had a knee revision in May and ices 3x day, and has achieved achieved 112 degrees even with additional hardware in her knee. Her problem includes extra swelling and pain above the knee where part of the hardware is attached as well as tight band but she persists
This is early days in your journey. Stay positive and patient.
Sue