Adjacent Hindfoot Joint Preservation Versus Fusion in Patients with Ipsilateral Hindfoot and Ankle Arthritis (COFAS Type 4) Undergoing Total Ankle Replacement: A Prospective Comparison of Outcomes Adjacent Hindfoot Joint Preservation Versus Fusion in Patients with Ipsilateral Hindfoot and Ankle Arthritis (COFAS Type 4) Undergoing Total Ankle Replacement: A Prospective Comparison of Outcomes Alastair Younger, Mohammad Arafah, Murray Penner, Timothy Daniels, Andrea Veljkovic, Kevin Wing, Joel Morash, Mark Glazebrook 25 March 2026 University of British Columbia, Vancouver, Canada