Gustilo and Pasternak developed a classification for describing a loosened cemented femoral component of a hip prosthesis. The authors are from Hennepin County Medical Center in Minneapolis.
Description
Type
minimal endosteal or inner cortical bone loss (broken stem, loosening of the cement-metal-bone interface)
I
proximal canal enlargement with cortical thinning >= 50% with or without focal lateral wall defect (circumferential wall intact)
II
focal wall defect (posteromedial wall defect)
III
total proximal circumferential bone defect (loss)
IV
Johanson et al used the classification to described an acetabular defect (Table 6)..
Description
Type
minimal cavitary enlargement with loosening of the cement-prosthesis-bone interface
I
thinned non-perforated wall with loosening of the cement-prosthesis-bone interface
II
local wall defect (anterior, posterior, superior, central)
III
massive and global bone collapse and/or defect involving one or both columns
IV
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