title: Comparison of cross-sections of different femoral components for revision total knee replacement.
abstract: PURPOSE. To compare the inner contour of the femoral component of 10 total knee replacement (TKR) designs for possible exchange in use.
  
  
  METHODS
  Inner contours of the femoral components of 10 cemented, cruciate-retaining TKR designs (e.motion, Genesis, Genia, Innex, LCS, Multigen Plus, NexGen, PFC, Scorpio, Vanguard) were scanned and reconstructed to 2-dimensional contours. Their cross-sections were compared by superimposition and aligning at the distal and anterior cuts. The patellar notch and outer contour were not analysed.
  
  
  RESULTS
  The maximum deviation was 5 mm in the posterior and posterior oblique cuts and 10 mm in the anterior oblique cut. Based on similarity of the inner contour, LCS and Innex was classified as group I, e.motion, Genesis, Scorpio, Vanguard, and Multigen Plus as group II, and Genia, NexGen, and PFC as group III. All 2 designs in group I were not compatible with the other 8 designs. Four of the 5 designs in group II showed good compatibility. All 3 designs in group III significantly differed in the posterior and oblique cuts.
  
  
  CONCLUSIONS
  A standardised inner contour of the femoral component can increase compatibility of different TKR systems in revision surgery and reduces the extent of bone resection.
authors.affiliation: Department of Orthopaedics, University of Rostock, Rostock, Germany. carmen.zietz@med.uni-rostock.de
authors.forename: Carmen
authors.initials: C
authors.lastname: Zietz
authors.forename: Philipp
authors.initials: P
authors.lastname: Bergschmidt
authors.forename: Andreas
authors.initials: A
authors.lastname: Fritsche
authors.forename: Daniel
authors.initials: D
authors.lastname: Kluess
authors.forename: Wolfram
authors.initials: W
authors.lastname: Mittelmeier
authors.forename: Rainer
authors.initials: R
authors.lastname: Bader
mesh_terms: D019645:Arthroplasty, Replacement, Knee; D006801:Humans; D007720:Knee Prosthesis; D011474:Prosthesis Design; D012086:Reoperation