The Journal of Bone and Joint Surgery, Vol 74, Issue 2 239-250, Copyright © 1992 by Journal of Bone and Joint Surgery, Inc
Remodeling and ingrowth of bone at two years in a canine cementless total hip-arthroplasty model
DR Sumner, TM Turner, RM Urban and JO Galante
Department of Orthopedic Surgery, Rush-Presbyterian-St. Luke's Medical Center, Chicago, Illinois 60612.
Remodeling and ingrowth of bone in association with the use of uncemented
femoral components were examined at two years in a canine total
hip-arthroplasty model. Twenty-two dogs received a unilateral uncemented
femoral stem that was made of Ti6A14V and was covered with one of three
types of titanium porous coating: fiber-metal, beads, or plasma
flame-spray. The amount and distribution of ingrowth of bone differed
somewhat among the groups at two years, but the patterns of remodeling of
bone in the medullary canal and cortex were similar. In general, about 15
to 18 per cent of the cortical bone was lost adjacent to the levels of the
stem that were covered with the porous coating. Most of the loss of
cortical bone was due to subperiosteal resorption proximally and endosteal
resorption at the middle and distal levels of the stem. Increased cortical
porosity accounted for only a small fraction of the loss of cortical bone.
The amount of medullary bone increased proximally and distally, so that the
loss of total bone mass was significantly only at the mid-part of the stem.
The amount of loss of cortical bone was similar to that observed in a
previous six-month study, suggesting that a steady state was achieved in
the present model.
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