title: The clinical characteristics of lower lumbar osteoporotic compression fractures treated by percutaneous vertebroplasty : a comparative analysis of 120 cases.
abstract: OBJECTIVE
  The purpose of this study is to provide accurate understanding of clinical presentations and surgical outcomes as well as to identify the unique characteristics of lower lumbar osteoporotic compression fracture (OCF).
  
  
  METHODS
  Clinical data were collected from 120 patients who had L3, L4 or L5 percutaneous vertebroplasty (PVP) performed from 2008 to 2012 at the single institute. L4 or L5 PVP patients were classified into group 1 and group 2 was for L3 PVP patients. Medical records were retrospectively investigated at 1 month after PVP. Long term follow-up results were obtained at a median value of 22 months after PVP.
  
  
  RESULTS
  75% of the patients in group 1 were not associated with traumatic events, 71% presenting with leg radiating symptoms and 46% requiring an additional decompressive surgery, more often than those in group 2. These differences are statistically significant (p<0.05). The short term medical record review demonstrated that only 73% of patients in group 1 were ameliorated with regard to back motion pain, whereas those in group 2 reported 87.7% rates of amelioration in identical category (p<0.05). The long term follow up confirmed a significantly worse outcome in group 1, with only 55.7% of patients reporting amelioration in their pain or functional status, but 71.7% rate of amelioration in group 2.
  
  
  CONCLUSIONS
  The OCFs at the L4 or L5 level have different clinical characteristics from those at upper levels of the lumbar spine.
authors.affiliation: Department of Neurosurgery, Nanoori Incheon Hospital, Incheon, Korea.
authors.forename: Seok
authors.initials: S
authors.lastname: Han
authors.affiliation: Department of Neurosurgery, Nanoori Incheon Hospital, Incheon, Korea.
authors.forename: Heung-Sik
authors.initials: HS
authors.lastname: Park
authors.affiliation: Department of Neurosurgery, Nanoori Incheon Hospital, Incheon, Korea.
authors.forename: Yong-Hun
authors.initials: YH
authors.lastname: Pee
authors.affiliation: Department of Neurosurgery, Nanoori Incheon Hospital, Incheon, Korea.
authors.forename: Seong-Hoon
authors.initials: SH
authors.lastname: Oh
authors.affiliation: Department of Neurosurgery, Nanoori Incheon Hospital, Incheon, Korea.
authors.forename: Il-Tae
authors.initials: IT
authors.lastname: Jang
keywords: Clinical presentation; Lower lumbar fracture; Percutaneous vertebroplasty; Surgical outcome