Left Knee Pain in a 7 1/2-Year-Old Boy

Harish S. Hosalkar, MD, MBMS (Orth), FCPS (Orth), DNB (Orth), Kelly M. Axsom, BA, Lawrence Wells, MD, Leslie Moroz, BA, and John P. Dormans, MD

Dr. Hosalkar is Senior Resident and Clinical Instructor, Department of Orthopedic Surgery, University of Pennsylvania, Philadelphia, Pennsylvania.

Ms. Axsom is Research Coordinator, Division of Hematology, Children's Hospital of Philadelphia, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania.

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

Ms. Moroz is Medical Student, Thomas Jefferson University, Philadelphia, Pennsylvania.

Harish S. Hosalkar, MD, MBMS (Orth), FCPS (Orth), DNB (Orth), Kelly M. Axsom, BA, Lawrence Wells, MD, Leslie Moroz, BA, and John P. Dormans, MD

Dr. Hosalkar is Senior Resident and Clinical Instructor, Department of Orthopedic Surgery, University of Pennsylvania, Philadelphia, Pennsylvania.

Ms. Axsom is Research Coordinator, Division of Hematology, Children's Hospital of Philadelphia, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania.

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

Ms. Moroz is Medical Student, Thomas Jefferson University, Philadelphia, Pennsylvania.

Harish S. Hosalkar, MD, MBMS (Orth), FCPS (Orth), DNB (Orth), Kelly M. Axsom, BA, Lawrence Wells, MD, Leslie Moroz, BA, and John P. Dormans, MD

Dr. Hosalkar is Senior Resident and Clinical Instructor, Department of Orthopedic Surgery, University of Pennsylvania, Philadelphia, Pennsylvania.

Ms. Axsom is Research Coordinator, Division of Hematology, Children's Hospital of Philadelphia, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania.

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

Ms. Moroz is Medical Student, Thomas Jefferson University, Philadelphia, Pennsylvania.