title: Measurement and comparison of tibial posterior slope angle in different methods based on three-dimensional reconstruction.
abstract: BACKGROUND
  The tibial posterior slope (PTS) is an important parameter for sagittal alignment which is associated with postoperative range of motion. However, the variations of different population subsets and different referential axes are still uncertain.
  
  
  METHODS
  In this study, 80 healthy people from South China were recruited and measured on three-dimensional reconstruction of CT, with application of three referential axes, the proximal tibial long axis, the anterior and posterior cortices.
  
  
  RESULTS
  The averages and standard deviations of medial PTS (MPTS) in the three methods were 8.43±3.06, 11.45±2.82 and 6.31±3.24, separately. The results of lateral PTS (LPTS) were 7.56±2.51, 10.17±2.42 and 5.22±2.59. There was no significant difference between the male and the female, and the two sides of one body. The results of the three axes varied but correlated with each other significantly. Through comparison it was found that, MPTS/LPTS of people from South China were different from the published data of other countries.
  
  
  CONCLUSIONS
  Although PTS change markedly according to the reference axis, they show significant correlations with each other, and may be used safely. There are differences associated with races, but not gender nor the two sides of the body.
  
  
  CONCLUSIONS
  The results of the study provided references for the reconstruction of the knee PTS, if the differences of reference axes, races and genders were considered.
authors.affiliation: Department of Orthopaedic Surgery, Nanfang Hospital, Guangzhou 510515, Guangdong Province, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Department of Orthopaedic Surgery, Nanfang Hospital, Guangzhou 510515, Guangdong Province, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Wang
authors.affiliation: Department of Orthopaedic Surgery, Nanfang Hospital, Guangzhou 510515, Guangdong Province, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Xiao
authors.affiliation: Department of Orthopaedic Surgery, Nanfang Hospital, Guangzhou 510515, Guangdong Province, China.
authors.forename: Liang
authors.initials: L
authors.lastname: Zhao
authors.affiliation: Department of Orthopaedic Surgery, Nanfang Hospital, Guangzhou 510515, Guangdong Province, China.
authors.forename: Zhi-Han
authors.initials: ZH
authors.lastname: Li
authors.affiliation: Department of Orthopaedic Surgery, Nanfang Hospital, Guangzhou 510515, Guangdong Province, China.
authors.forename: Ge
authors.initials: G
authors.lastname: Yan
authors.affiliation: Department of Orthopaedic Surgery, Nanfang Hospital, Guangzhou 510515, Guangdong Province, China. Electronic address: mariaresearcher@hotmail.com.
authors.forename: Zhan-Jun
authors.initials: ZJ
authors.lastname: Shi
mesh_terms: D000328:Adult; D019645:Arthroplasty, Replacement, Knee; D002681:China; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D007719:Knee Joint / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D061330:Multidetector Computed Tomography; D013977:Tibia / Q000000981:diagnostic imaging*; D055815:Young Adult
keywords: Knee; Referential axes; Three dimensional reconstruction; Tibial posterior slope