title: Median nerve damage during two-portal endoscopic carpal tunnel release.
abstract: OBJECTIVE
  To evaluate the adverse effects of Chow's two-portal endoscopic carpal tunnel release (ECTR) performed by an experienced surgeon on median nerve function in patients with idiopathic carpal tunnel syndrome, as compared to open carpal tunnel release (OCTR).
  
  
  METHODS
  Eighty-seven hands subjected to ECTR and 65 hands subjected to OCTR were reviewed. Both groups of patients were similar with regard to age, gender, and severity of the disease. Both groups were compared for the number of hands showing worsening of motor distal latency, sensory conduction velocity, and sensory disturbance after surgery.
  
  
  RESULTS
  Thirteen hands of 12 patients showed worsening of median nerve function after ECTR, while only one hand showed worsening after OCTR. This difference was statistically significant (p=0.0041).
  
  
  CONCLUSIONS
  Median nerve damage, although transient or not serious, may occur even if the procedure is done correctly.
authors.affiliation: Department of Orthopedic Surgery, Suwa Red Cross Hospital, Kogan-Dori 5-11-50, Suwa-City 392-8510, Japan. sigeharu-utiyama@suwa.jrc.or.jp
authors.forename: Shigeharu
authors.initials: S
authors.lastname: Uchiyama
authors.forename: Takashi
authors.initials: T
authors.lastname: Yasutomi
authors.forename: Takashi
authors.initials: T
authors.lastname: Fukuzawa
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Nakagawa
authors.forename: Mikio
authors.initials: M
authors.lastname: Kamimura
authors.forename: Tadaatsu
authors.initials: T
authors.lastname: Miyasaka
mesh_terms: D000328:Adult; D000368:Aged; D002349:Carpal Tunnel Syndrome / Q000601:surgery*; D004594:Electrophysiology; D004724:Endoscopy / Q000009:adverse effects*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008475:Median Nerve / Q000293:injuries*; D008875:Middle Aged; D009460:Neurologic Examination; D019635:Neurosurgical Procedures / Q000009:adverse effects*; D011183:Postoperative Complications / Q000503:physiopathology*; D012189:Retrospective Studies