QUANTITATIVE INGROWTH ANALYSIS OF A POROUS-COATED ACETABULAR COMPONENT IN A CANINE MODEL

Histomorphometric analysis of bone ingrowth into a porous-coated aceta bular component was evaluated in a canine model. A total of nine prost heses were evaluated, 3 at 6 months, 3 at 12 months, and 3 at 24 month s after implantation. All implants were grossly stable at the time of retrieval. The mean percentage of bone ingrowth was 12% at 6 months, 2 4% at 12 months, and 24% at 24 months. Narrow radiolucent lines noted on microradiographs were more evident at the 6 month time period than at the 12 or 24 month time periods. Bone ingrowth into a porous-coated acetabular component in a weight-bearing model may continue beyond th e 6 month time period, and early evaluation of bone ingrowth may under estimate final bone ingrowth.