title: Preliminary study on the lesion location and prognosis of cubital tunnel syndrome by motor nerve conduction studies.
abstract: BACKGROUND
  To study lesions' location and prognosis of cubital tunnel syndrome (CubTS) by routine motor nerve conduction studies (MNCSs) and short-segment nerve conduction studies (SSNCSs, inching test).
  
  
  METHODS
  Thirty healthy subjects were included and 60 ulnar nerves were studied by inching studies for normal values. Sixty-six patients who diagnosed CubTS clinically were performed bilaterally by routine MNCSs and SSNCSs. Follow-up for 1-year, the information of brief complaints, clinical symptoms, and physical examination were collected.
  
  
  RESULTS
  Sixty-six patients were included, 88 of nerves was abnormal by MNCS, while 105 was abnormal by the inching studies. Medial epicondyle to 2 cm above medial epicondyle is the most common segment to be detected abnormally (59.09%), P < 0.01. Twenty-two patients were followed-up, 17 patients' symptoms were improved. Most of the patients were treated with drugs and modification of bad habits.
  
  
  CONCLUSIONS
  (1) SSNCSs can detect lesions of compressive neuropathy in CubTS more precisely than the routine motor conduction studies. (2) SSNCSs can diagnose CubTS more sensitively than routine motor conduction studies. (3) In this study, we found that medial epicondyle to 2 cm above the medial epicondyle is the most vulnerable place that the ulnar nerve compressed. (4) The patients had a better prognosis who were abnormal in motor nerve conduction time only, but not amplitude in compressed lesions than those who were abnormal both in velocity and amplitude. Our study suggests that SSNCSs is a practical method in detecting ulnar nerve compressed neuropathy, and sensitive in diagnosing CubTS. The compound muscle action potentials by SSNCSs may predict prognosis of CubTS.
authors.forename: Zhu
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Department of Neurology, The First Hospital of Peking University, Beijing 100034, China.
authors.forename: Zhi-Rong
authors.initials: ZR
authors.lastname: Jia
authors.forename: Ting-Ting
authors.initials: TT
authors.lastname: Wang
authors.forename: Xin
authors.initials: X
authors.lastname: Shi
authors.forename: Wei
authors.initials: W
authors.lastname: Liang
mesh_terms: D000328:Adult; D000368:Aged; D020430:Cubital Tunnel Syndrome / Q000503:physiopathology*; D004576:Electromyography; D004594:Electrophysiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009431:Neural Conduction / Q000502:physiology; D014459:Ulnar Nerve / Q000502:physiology