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¹GATA Haydarpaşa Eğitim Hastanesi, Beyin Cerrahisi Kliniği, İstanbul, Türkiye
²Memorial Ataşehir Hastanesi, Beyin Cerrahisi Kliniği, İstanbul, Türkiye Ulnar nerve instability which is a rare complication after decompression surgery due to ulnar nerve entrapment in the cubital tunnel is presented here. In situ decompression surgery at the elbow level is performed to a 21 year old male patient because of the clinical and electrophysiological findings in his left forearm. The patient was admitted due to pain in his forearm and left fingers, pain during elbow motion and discomforting stuck feeling at the site of operation area in the elbow. It was seen that the ulnar nerve was dislocated from the cubital tunnel to the medial epicondyle's edge during elbow flexion thus instability in the ulnar nerve was observed. The patient was reoperated with anterior transposition surgery to ulnar nerve. Because ulnar nerve instability is rare and iatrogenic, it is discussed in the light of literature. Anahtar Kelimeler : Ulnar nerve, Cubital groove, Medial epicondyle, Entrapment neuropathy