title: [Analysis of the pelvic stability after type I resection of iliac tumor].
abstract: OBJECTIVE
  To analyze the pelvic stability after type I resection of iliac tumor.
  
  
  METHODS
  Six adult cadaveric specimens were tested. The iliac subtotal resection models were established according to Ennecking's type I resection. Markers were affixed to the key region of the pelves. Axial loading from the proximal lumbar was applied by MTS load cell in the gradient of 0-500 N in the double feet standing state. Images in front view were obtained using CCD camera. Based on Image J software, displacements of the first sacral vertebrae (S1) of the resected pelves and the intact pelves were calculated using digital marker tracing method with center-of-mass algorithm.
  
  
  RESULTS
  Serious instabilities were found in the resected pelves. S1 rotational movements around the normal side femoral head of the resected pelvis were found. The average vertical displacement of S1 of the resected pelvis was (7 +/- 3) mm under vertical load of 500 newtons, which were 8.3 times compared to the intact pelvis. The average angle of S1 rotation around the normal side femoral head of the resected pelvis was (4.0 +/- 1.8) degrees, which were 12.5 times compared to the intact pelvis.
  
  
  CONCLUSIONS
  Biomechanical model of type I resection of iliac tumor are established. Essential pelvic reconstruction must be introduced because of the serious instability of the bone defection after tumor resection.
authors.affiliation: Department of Orthopaedics, Tongji Hospital of Tongji University, Shanghai 200065, China.
authors.forename: Yong-wei
authors.initials: YW
authors.lastname: Jia
authors.forename: Li-ming
authors.initials: LM
authors.lastname: Cheng
authors.forename: Guang-rong
authors.initials: GR
authors.lastname: Yu
authors.forename: Yan
authors.initials: Y
authors.lastname: Yu
authors.forename: Yong-jian
authors.initials: YJ
authors.lastname: Lou
authors.forename: Yun-feng
authors.initials: YF
authors.lastname: Yang
authors.forename: Zu-quan
authors.initials: ZQ
authors.lastname: Ding
mesh_terms: D000328:Adult; D000368:Aged; D001696:Biomechanical Phenomena; D001859:Bone Neoplasms / Q000503:physiopathology / Q000601:surgery*; D005260:Female; D006801:Humans; D007085:Ilium / Q000293:injuries; D008297:Male; D008875:Middle Aged; D008954:Models, Biological; D010388:Pelvis / Q000503:physiopathology*; D016059:Range of Motion, Articular