1. Department of Orthopedic Surgery University of Michigan Ann Arbor Michigan USA
2. Department of Orthopedic Surgery New York University NewYork USA
3. Department of Orthopedic and Trauma Surgery Pitié‐Salpétrière Hospital Assistance Publique–Hopitaux de Paris, UPMC Paris France
4. Dorr Institute for Arthritis Research and Education Los Angeles California USA