title: Transforaminal lumbar interbody fusion using unilateral pedicle screw fixation plus contralateral translaminar facet screw fixation in lumbar degenerative diseases.
abstract: BACKGROUND
  Transforaminal lumbar interbody fusion (TLIF) has been used in lumbar degenerative diseases. Some researchers have applied unilateral fixation in TLIF to reduce operational trauma without compromising the clinical outcome, but it is always suspected biomechanically unstable. The supplementary contralateral translaminar facet screw (cTLFS) seemed to be able to overcome the inherent drawbacks of unilateral pedicle screw (uPS) fixation theoretically. This study evaluates the safety, feasibility and efficacy of TLIF using uPS with cTLFS fixation in the treatment of lumbar degenerative diseases (LDD).
  
  
  METHODS
  50 patients (29 male) underwent the aforementioned surgical technique for their LDD between December 2009 and April 2012. The results were evaluated based on visual analogue scale (VAS) of the leg and back, Japanese Orthopedic Association (JOA) score and Oswestry Disability Index (ODI) were recorded. The radiographic examinations in form of X-ray, computed tomography (CT) or magnetic resonance imaging was done preoperatively and 1 week, 3 months, 6 months, 12 months and 24 months postoperatively. The student t-test was used for comparison between the preoperative values and postoperative counterparts. P < 0.05 was considered to be statistically significant.
  
  
  RESULTS
  Among 50 patients, 22 received one level fusion and 28 two level's, with corresponding operation time and estimated blood loss being approximately 90 min, 150 ml and 120 min, 200 ml, respectively. No severe complications happened perioperatively. The mean VAS (back, leg) scores dropped from (7.6, 7.5) preoperatively to (2.1, 0.6) at 12 months' followup, ODI from 49.1 preoperatively to 5.6 and JOA score raised from 10.6 preoperatively to 28.5, all P < 0.001, suggesting of good clinical outcome. From the three-dimensional reconstructed CT, 62 out of 70 segments displayed solid fusion with fusion rate of 88.6% at 12 months postoperatively.
  
  
  CONCLUSIONS
  TLIF using uPS fixation plus cTLFS fixation is a safe, feasible and effective technique in the treatment of one or two level lumbar degenerative diseases short termly.
authors.affiliation: Department of Orthopedics, Zhongshan Hospital, Fudan University, Shanghai, China.
authors.forename: Fubing
authors.initials: F
authors.lastname: Liu
authors.affiliation: Department of Orthopedics, Zhongshan Hospital, Fudan University, Shanghai, China.
authors.forename: Chun
authors.initials: C
authors.lastname: Jiang
authors.affiliation: Department of Orthopedics, Zhongshan Hospital, Fudan University, Shanghai, China.
authors.forename: Yuanwu
authors.initials: Y
authors.lastname: Cao
authors.affiliation: Department of Orthopedics, Zhongshan Hospital, Fudan University, Shanghai, China.
authors.forename: Xiaoxing
authors.initials: X
authors.lastname: Jiang
authors.affiliation: Department of Orthopedics, Zhongshan Hospital, Fudan University, Shanghai, China.
authors.forename: Zhenzhou
authors.initials: Z
authors.lastname: Feng
keywords: Lumbar degenerative diseases; Lumbar vertebra; bone screw; degenerative disease; transforaminal lumbar interbody fusion; translaminar facet screw