One of the mysteries of the English language finally explained.
Osteochondritis involving the epiphysis of the femoral head in children, resulting in pain and progressive deformity of the hip joint.
Early 20th century; earliest use found in American Journal Orthopedic Surgery. From the genitive of the name of Georg Clemens Perthes, German surgeon, who described the condition in 1910 + disease.
Perthes' disease/ˈpəːtəz dɪˌziːz/
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