n :  osteochondritis affecting the bony knob at the upper end of the femur - called also Legg-Perthes disease , Perthes disease 
 
Legg, Arthur Thornton (1874-1939), American orthopedic surgeon. Legg published the first description of Legg-Calvé-Perthes disease in February 1910. He is also remembered for introducing an operation for correcting weakness of the abductor muscles of the thigh in cases of infantile paralysis.
 
Calvé, Jacques (1875-1954), French surgeon. Calvé published independently a description of Legg-Calvé-Perthes disease in July 1910.
 
Perthes, Georg Clemens (1869-1927), German surgeon. Perthes published his description of Legg-Calvé-Perthes disease in October 1910. A pioneer in radiotherapy, he studied the biological effects of X-ray treatment in surgery. He used deep X-ray therapy for the first time in 1903.
 
 
 
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