H Theodore Harcke1, B Pruszczynski2. 1. Nemours/Alfred I. duPont Hospital for Children, 1600 Rockland Road, Wilmington, DE, 19803, USA. howard.harcke@gmail.com. 2. Clinics of Orthopaedics and Paediatric Orthopaedics, Medical University of Lodz, Lodz, Poland.