[A forgotten eponym: the Mackiewicz sign].

In 1913, Dr. Jacob Mackiewicz, a Polish-Jewish neurologist, described a clinical sign (a maneuver) which indicates a femoral nerve injury or L4 root injury. He called it the "cruralis phenomenon", but in the German and Slavic literature, the sign is named after him: "the patient lies prone, the examiner lifts the thigh in one hand, with the other hand, bends the patient's knee slowly; this maneuver causes severe pain in the anterior part of the thigh and over the groin".