TY - JOUR
T1 - The effect on wear of lift-off in total knee arthroplasty
AU - Todo, Shinichi
AU - Blunn, Gordon W.
AU - Harrison, Mark
AU - Freeman, Michael A. R.
PY - 2003
Y1 - 2003
N2 - Femoral lift-off has been reported in total knee arthroplasty using dynamic fluoroscopic analysis. However, the effect of femoral lift-off on ultra-high-molecular-weight polyethylene (UHMWPE) is not clear. The objective of this study was to evaluate the effect of lift-off movement on the wear of UHMWPE using a pin-on-disc testing machine. Using oxidised UHMWPE, delamination was observed in 70% of the discs with lift-off movement, as against none in without lift-off movement (p = 0.0603). In non-oxidised UHMWPE the depth of the wear track was increased in the impact area after lift-off, but there was no delamination and no increase in wear as measured by weight loss. UHMWPE can sustain the impact of after lift-off with neither delamination nor wear by other mechanisms. In contrast, degraded (i.e., oxidised) UHMWPE undergoes delamination after lift-off. Since it is probable that lift-off cannot be prevented, oxidised UHMWPE should never be used in TKA.
AB - Femoral lift-off has been reported in total knee arthroplasty using dynamic fluoroscopic analysis. However, the effect of femoral lift-off on ultra-high-molecular-weight polyethylene (UHMWPE) is not clear. The objective of this study was to evaluate the effect of lift-off movement on the wear of UHMWPE using a pin-on-disc testing machine. Using oxidised UHMWPE, delamination was observed in 70% of the discs with lift-off movement, as against none in without lift-off movement (p = 0.0603). In non-oxidised UHMWPE the depth of the wear track was increased in the impact area after lift-off, but there was no delamination and no increase in wear as measured by weight loss. UHMWPE can sustain the impact of after lift-off with neither delamination nor wear by other mechanisms. In contrast, degraded (i.e., oxidised) UHMWPE undergoes delamination after lift-off. Since it is probable that lift-off cannot be prevented, oxidised UHMWPE should never be used in TKA.
KW - delamination
KW - lift-off
KW - total knee arthroplasty
KW - UHMWPE
KW - wear
UR - http://www.scopus.com/inward/record.url?scp=0042931211&partnerID=8YFLogxK
M3 - Article
C2 - 12883172
AN - SCOPUS:0042931211
SN - 0959-2989
VL - 13
SP - 231
EP - 234
JO - Bio-Medical Materials and Engineering
JF - Bio-Medical Materials and Engineering
IS - 3
ER -