1. Department of Orthopaedic Surgery, Robert Wood Johnson Medical School, Rutgers University, New Brunswick, New Jersey, USA.
2. University Orthopaedic Associates, Somerset, New Jersey, USA.
3. Department of Radiology, Robert Wood Johnson Medical School, Rutgers University, New Brunswick, New Jersey, USA.
4. University Radiology, New Brunswick, New Jersey, USA.
5. Department of Statistics and Biostatistics, Rutgers University, New Brunswick, New Jersey, USA.
6. St Catherine University, Minneapolis, Minnesota, USA.