Bone ingrowth into porous-coated tibial components implanted with autograft bone chips. Analysis of ten consecutively retrieved implants.
Ten asymmetric porous-coated tibial knee components were consecutively retrieved from nine patients with implantation times ranging from 1 week to 48 months. Morselized autograft bone chips were applied to the resected surface of the tibia prior to component implantation. Microradiographic analysis showed bone in contact with 64 +/- 10% of the porous-coated interface. Backscattered electron imaging of the bone-implant interface revealed bone within 8-22% of the porous coating. Although bone in the form of autograft bone chips was observed in the porous coating of the 1 and 3 week specimens, it was not connected to the host bone. By 3 and 6 months, the bone chips were integrated and connected to the host bone providing osseous continuity from the porous coating to the skeleton. This study shows that reproducible bone ingrowth into porous-coated tibial components is achievable using autograft bone chips to promote bone fixation.
Bloebaum
R D
RD
Bone and Joint Research Laboratory, Department of Veterans Affairs Medical Center, Salt Lake City, UT 84148.
Rubman
M H
MH
Hofmann
A A
AA
D000368:Aged; D016025:Bone Transplantation / Q000473:pathology / Q000502:physiology; D005260:Female; D006801:Humans; D007720:Knee Prosthesis; D008297:Male; D008852:Microradiography; D008854:Microscopy, Electron; D008875:Middle Aged; D016348:Osseointegration; D012086:Reoperation; D013977:Tibia / Q000473:pathology / Q000502:physiology* / Q000648:ultrastructure