Perthes' disease
/ˈpəːtəz dɪˌziːz/(also Perthes disease) Medicine
noun
Osteochondritis involving the epiphysis of the femoral head in children, resulting in pain and progressive deformity of the hip joint.
Origin
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.