title: Surface coating to improve the metal-cement bonding in cemented femur stems.
abstract: BACKGROUND
  Hydrolytic debonding of the metal-cement interface is one of the main reasons for aseptic loosening in cemented hip arthroplasty.
  
  
  METHODS
  BiContact femur stems (CoCrMo-/TiAl6V4-alloy) were coated by a silica/silane interlayer coating system. The stems were cemented into artificial femurs. The cyclical loading (DIN ISO 7206-4) was performed within a hip-simulator. Uncoated stems (CoCrMo-/TiAl6V4-alloy) were prepared and loaded the same way. After loading, the metal-cement and the bone-cement interfaces were analysed. Unloaded uncoated and unloaded coated BiContact stems served as a control.
  
  
  RESULTS
  The coated loaded stems showed a significant reduction in debonding and cement failure (P < or = 0.05). A high correlation was documented between debonding and cement failure (rSpear> or = 0.9). There was no significant difference between CoCrMo- and TiAl6V4-stems (P > or = 0.05).
  
  
  CONCLUSIONS
  The silica/silane coating significantly decreased hydrolytic debonding at the metal-bone cement interface with consecutively less cement failure.
authors.affiliation: Department of Orthopaedic Surgery, University Hospital Aachen, Pauwelsstr. 30, 52074 Aachen, Germany. torsten.mumme@gmx.de
authors.forename: T
authors.initials: T
authors.lastname: Mumme
authors.forename: R
authors.initials: R
authors.lastname: Marx
authors.forename: R
authors.initials: R
authors.lastname: Müller-Rath
authors.forename: C H
authors.initials: CH
authors.lastname: Siebert
authors.forename: D C
authors.initials: DC
authors.lastname: Wirtz
mesh_terms: D000268:Adhesiveness; D019644:Arthroplasty, Replacement, Hip / Q000379:methods; D002484:Cementation; D020099:Coated Materials, Biocompatible; D006622:Hip Prosthesis; D006801:Humans; D011475:Prosthesis Failure; D012821:Silanes; D012822:Silicon Dioxide; D013499:Surface Properties; D013718:Tensile Strength
chemical_list: D020099:Coated Materials, Biocompatible; D012821:Silanes; D012822:Silicon Dioxide