Paprosky et al reported a classification for femoral bone loss. The extent of bone loss impacts a hip replacement in many ways. The authors are from Rush Medical College in Chicago.
Parameters:
(1) metaphyseal bone loss
(2) diaphyseal (shaft) bone loss
(3) isthmus
Metaphyseal Bone Loss
Diaphyseal Bone Loss
Isthmus
Type
minimal
none
supported
I
extensive
minimal
supported
II
extensive
extensive, >= 4 cm intact
supported
IIIA
extensive
extensive < 4 cm intact
supported
IIIB
extensive
extensive
not supported
IV
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