12-Year-Old Boy With Left Knee Pain

Jorge Fabregas, MD, Lubica Jencikova-Celerin, MD, Portia A. Kreiger, MD, and John P. Dormans, MD

Dr. Fabregas is Clinical Fellow, Division of Orthopaedic Surgery, Dr. Jencikova-Celerin is Research Fellow, Division of Orthopaedic Surgery, and Dr. Kreiger is Clinical Fellow, Division of Anatomic Pathology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania.

Dr. Dormans is Chief of Orthopaedic Surgery, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, and Professor of Orthopaedic Surgery, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania.

Jorge Fabregas, MD, Lubica Jencikova-Celerin, MD, Portia A. Kreiger, MD, and John P. Dormans, MD

Dr. Fabregas is Clinical Fellow, Division of Orthopaedic Surgery, Dr. Jencikova-Celerin is Research Fellow, Division of Orthopaedic Surgery, and Dr. Kreiger is Clinical Fellow, Division of Anatomic Pathology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania.

Dr. Dormans is Chief of Orthopaedic Surgery, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, and Professor of Orthopaedic Surgery, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania.

Jorge Fabregas, MD, Lubica Jencikova-Celerin, MD, Portia A. Kreiger, MD, and John P. Dormans, MD

Dr. Fabregas is Clinical Fellow, Division of Orthopaedic Surgery, Dr. Jencikova-Celerin is Research Fellow, Division of Orthopaedic Surgery, and Dr. Kreiger is Clinical Fellow, Division of Anatomic Pathology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania.

Dr. Dormans is Chief of Orthopaedic Surgery, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, and Professor of Orthopaedic Surgery, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania.