title: The effect of learning curve on the results of percutaneous transforaminal endoscopic lumbar discectomy.
abstract: OBJECTIVE
  To demonstrate the correlation of postoperative visual analog scale (VAS) of leg pain and adequacy of disc decompression with the learning curve of the surgeon who performed PTELD.
  
  
  METHODS
  The authors retrospectively reviewed 50 matched criteria patients arranged into 5 groups which were categorized by the period of operation from January 2010 to May 2011 successively. Each patient's preoperative and postoperative VAS of leg pain at 1-week, 3-week, and 6-week follow-up were analyzed and demonstrated the correlation with the learning curve. Additionally, the authors also showed the alteration of thecal sac expansion between the preoperative and the postoperative MRI to demonstrate the learning curve during the different operative period.
  
  
  RESULTS
  The VAS of leg pain as well as the mean differences of VAS of leg pain in each groups of patient were improved at each postoperative period follow-up and have a statistically significant improvement at 6-week follow-up. When the authors analyzed the mean differences VAS at pre- and post-operative 6-week follow-up among each groups of patients, it demonstrated that the learning curve had the progressive effect on the result of the operation. Also for the adequacy of disc decompression, the improvement of the thecal sac expansion was established when the amount of surgical volume was increased.
  
  
  CONCLUSIONS
  The amount of surgical volume in focus of PTELD has an influence in the improvement of the VAS of leg pain and the adequacy of disc decompression. However, the patient selection such as types of disc herniation is also play an important role in accomplishment.
authors: Department of Orthopaedics, Phramongkutklao Hospital and College of Medicine, Bangkok, Thailand. chaichankulc@yahoo.com
authors: Chaisiri
authors: C
authors: Chaichankul
authors: Sompob
authors: S
authors: Poopitaya
authors: Warat
authors: W
authors: Tassanawipas
mesh_terms: D000328:Adult; D017587:Diskectomy, Percutaneous / Q000379:methods*; D004724:Endoscopy; D005260:Female; D006801:Humans; D007405:Intervertebral Disc Displacement / Q000601:surgery*; D059032:Learning Curve; D008297:Male; D008875:Middle Aged; D010147:Pain Measurement; D016896:Treatment Outcome; D055815:Young Adult