Feature article
A six-year-old boy comes to the pediatrician's office complaining of a stiff hip and limping, but he didn't fall or twist his leg. One of the causes could be Legg-Calve-Perthes disease. From the About.com Guide to Rare/Orphan Diseases.

AAOS: Legg-Calve-Perthes Disease
Concise description of disease and treatment, from the American Academy of Orthopedic Surgeons.

Legg-Calve-Perthes Disease
Information from the Pediatric Orthopedic Institute (U.S.).

Legg-Calve-Perthes Disease
Brief information from the Shriners Hospitals (U.S.).

Perthes Association (U.K.)
Volunteer organization offers information, links.

eMedicine: Legg-Calve-Perthes Disease
Medical journal article covers disease, diagnosis, and treatment. For health care providers.

Wheeless' Textbook of Orthopaedics
Complete technical medical information and sample x-rays of the disease. For health care providers.