title: The Clinical Results of Percutaneous Endoscopic Interlaminar Discectomy (PEID) in the Treatment of Calcified Lumbar Disc Herniation: A Case-Control Study.
abstract: BACKGROUND
  Percutaneous endoscopic interlaminar discectomy (PEID), which poses advantages for certain types of herniated disc, is gaining wider acceptance in clinical practice. We retrospectively analyzed the efficacy of the PEID technique in treatment of calcified lumbar disc herniation.
  
  
  METHODS
  A retrospective case-control study.
  
  
  METHODS
  University hospital in China.
  
  
  OBJECTIVE
  To evaluate the efficacy of the PEID technique in treatment of calcified lumbar disc herniation, and a comparison between calcified and noncalcified disc herniation was drawn to analyze the causes of herniated disc calcification.
  
  
  METHODS
  Data from patients who underwent full-endoscopic lumbar discectomy in our department between March 2011 and May 2013 were collected. Thirty cases with calcified lumbar disc herniation were included in the study group, and 30 age-, gender-, and body mass index (BMI)-matched cases with noncalcified lumbar disc herniation served as controls. Perioperative data, preoperative and postoperative Visual Analog Scale (VAS) scores, Oswestry Disability Index (ODI) values, MacNab scores, and postoperative low-extremity dysesthesia among patients in the 2 groups were collected.
  
  
  RESULTS
  The values of computed tomography (CT) in the calcified group were significantly higher than those in the noncalcified group (P < 0.01). The preoperative disease courses in the 2 groups were similar. However, there was a statistically significant difference in the duration of traditional Chinese medicines (TCM) administration (P < 0.01). VAS and ODI scores improved significantly after surgery, but there were no significant differences between the 2 groups (P > 0.05). Three months after surgery, the rate of low-extremity dysesthesia in the calcified group was significantly higher than that in the control group (P = 0.03) but became similar at 6 months. By applying MacNab criteria the proportions of good and excellent were greater than 90% in both groups, and there was no difference between groups (P > 0.05).
  
  
  CONCLUSIONS
  The sample size was small in this retrospective study.
  
  
  CONCLUSIONS
  The PEID technique is an effective method in the treatment of calcified lumber disc herniation, although the rate of postoperative dysesthesia is higher in this group during the early postoperative period. Long-term TCM administration may be related to the calcification of herniated lumbar discs.
authors.affiliation: Department of Spine Surgery, Changhai Hospital, the Second Military Medical University, Shanghai, China; Department of Orthopedics, Ningbo No.7 Hospital, Ningbo, Zhejiang, China.
authors.forename: Xu
authors.initials: X
authors.lastname: Dabo
authors.affiliation: Department of Spine Surgery, Changhai Hospital, the Second Military Medical University, Shanghai, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Ziqiang
authors.affiliation: Department of Spine Surgery, Changhai Hospital, the Second Military Medical University, Shanghai, China.
authors.forename: Zhao
authors.initials: Z
authors.lastname: Yinchuan
authors.affiliation: Department of Spine Surgery, Changhai Hospital, the Second Military Medical University, Shanghai, China.
authors.forename: Ni
authors.initials: N
authors.lastname: Haijian
authors.affiliation: Department of Spine Surgery, Changhai Hospital, the Second Military Medical University, Shanghai, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Kai
authors.affiliation: Department of Spine Surgery, Changhai Hospital, the Second Military Medical University, Shanghai, China.
authors.forename: Liu
authors.initials: L
authors.lastname: Yanbin
authors.affiliation: Department of Spine Surgery, Changhai Hospital, the Second Military Medical University, Shanghai, China.
authors.forename: Fu
authors.initials: F
authors.lastname: Qiang
authors.affiliation: Department of Orthopedics, Changhai Hospital, the Second Military Medical University, Shanghai, China.
authors.forename: Wang
authors.initials: W
authors.lastname: Chuanfeng
mesh_terms: D000328:Adult; D000368:Aged; D002114:Calcinosis / Q000000981:diagnostic imaging / Q000453:epidemiology / Q000601:surgery*; D016022:Case-Control Studies; D002681:China / Q000453:epidemiology; D018450:Disease Progression; D017587:Diskectomy, Percutaneous / Q000379:methods*; D005260:Female; D006801:Humans; D007405:Intervertebral Disc Displacement / Q000000981:diagnostic imaging / Q000453:epidemiology / Q000601:surgery*; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D044583:Neuroendoscopy / Q000379:methods*; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome; D055815:Young Adult