Surface coating to improve the metal-cement bonding in cemented femur stems.
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.
Mumme
T
T
Department of Orthopaedic Surgery, University Hospital Aachen, Pauwelsstr. 30, 52074 Aachen, Germany. torsten.mumme@gmx.de
Marx
R
R
Müller-Rath
R
R
Siebert
C H
CH
Wirtz
D C
DC
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
D020099:Coated Materials, Biocompatible; D012821:Silanes; D012822:Silicon Dioxide