title: Clinical outcome and influencing factor for repeat lumbar discectomy for ipsilateral recurrent lumbar disc herniation.
abstract: OBJECTIVE
  Recurrent herniation following disc excision has been reported in 5-15% of patients. There have been numerous studies of recurrent disc herniation, but these have analyzed mixed patient populations. We designed this study to analyze the factors that influencing the clinical results, and efficiency of repeat discectomy for recurrent lumbar disc herniation occurring at the same level and on the same side after primary discectomy.
  
  
  METHODS
  Between 1990 and 2011, a total of 52 patients who underwent repeat discectomy for recurrent lumbar disc herniation were retrospectively analyzed. Clinical outcomes were measured with Macnab criteria and visual analog scale (VAS score). Clinical parameters were also analyzed for influencing factors for outcome.
  
  
  RESULTS
  Based on Macnab criteria, an excellent surgical outcome was achieved in 28 cases (54%), a good outcome in 22 cases (42%), a fair outcome in 1 case (2%), and a poor outcome in 1 case (2%). Based on VAS score, 47 of 52 patients (90%) showed more than 4 score improvement. Age, sex, diabetes mellitus, smoking, time interval between repeat and primary discectomy, duration of recurrent symptoms, and extent of disc herniation did not significantly affect Macnab criteria and VAS score. However, a traumatic event showed less VAS score improvement whereas not affecting on Macnab criteria.
  
  
  CONCLUSIONS
  Conventional open lumbar discectomy performed as repeat surgery for recurrent herniation showed satisfactory results. Based on the results of this study, repeat discectomy can be recommended for the management of recurrent lumbar disc herniation. Further study is needed to evaluate factors related to the outcomes of repeat discectomy.
authors.affiliation: Department of Neurosurgery, Dong-A University College of Medicine, Busan, Korea.
authors.forename: Yeon Sung
authors.initials: YS
authors.lastname: Jung
authors.affiliation: Department of Neurosurgery, Dong-A University College of Medicine, Busan, Korea.
authors.forename: Hyu Jin
authors.initials: HJ
authors.lastname: Choi
authors.affiliation: Department of Neurosurgery, Dong-A University College of Medicine, Busan, Korea.
authors.forename: Young-Min
authors.initials: YM
authors.lastname: Kwon
keywords: Discectomy; Lumbar spine; Recurrent