PELVIS AND HIPPerthes' or Perthes' resembling disease in 13-month-old boyMaus, Uwe; Andereya, Stefan; Ihme, Nicola; Gravius, Sascha; Niedhart, Christopher; Ohnsorge, Jörg A.K.; Niethard, Fritz U. Author Information Department of Orthopaedic Surgery, University Hospital of Aachen, RWTH Aachen, Germany Correspondence to Dr Uwe Maus, MD, Department of Orthopaedic Surgery, University Hospital of Aachen, RWTH Aachen, Pauwelsstr. 30, 52074 Aachen, Germany Tel: +49 241 80 89410; fax: +49 241 80 82453; e-mail: [email protected] Journal of Pediatric Orthopaedics B: May 2008 - Volume 17 - Issue 3 - p 120-124 doi: 10.1097/BPB.0b013e3282f9461e Buy Metrics Abstract Onset of Perthes' disease is reported frequently from the age of 2 years. Latest publications showed cases with onset of this disease in infancy at ages of 17 and 18 months. We report the case of a 13-month-old boy, who presented with left-sided limping. Radiological examination showed reduced height and fragmentation of the femoral head. Magnetic resonance imaging showed the typical signs of an avascular necrosis. Follow-up was done after 3, 7 and 15 months. Plain radiography showed the femoral head in a state of reparation. This is the youngest documented case of Legg–Calvé–Perthes' disease and is discussed under consideration of the current literature. © 2008 Lippincott Williams & Wilkins, Inc.