Ankle plantar flexor muscle performance and patient reported outcomes in people following total ankle arthroplasty

•Preoperative ankle power generation was not different following surgery.•Ankle power generation was less than control values postoperatively.•Postoperative ankle power, strength, and gait speed were directly correlated.•Postoperative power and strength predicted longer-term patient reported outcomes.•Ankle muscle performance may be an important postoperative clinical target.