The Journal of Bone and Joint Surgery, Vol 77, Issue 6 903-910, Copyright © 1995 by Journal of Bone and Joint Surgery, Inc
Evaluation of bone ingrowth in proximally and extensively porous-coated anatomic medullary locking prostheses retrieved at autopsy
CA Engh, JP Hooten, KF Zettl-Schaffer, M Ghaffarpour, TF McGovern and JD Bobyn
Anderson Orthopaedic Research Institute, Arlington, Virginia 22206, USA.
Three proximally (40 per cent) and five extensively (80 per cent)
porous-coated anatomic medullary locking femoral components were retrieved
from seven cadavera at autopsy. Each component (with the surrounding,
intact femur), was sectioned transversely at one-centimeter intervals.
Backscattered scanning electron microscopy was used to evaluate
circumferentially the interface between the bone and the porous surface of
each section. Bone ingrowth was considered to be present within a field
when bone was in contact with the outermost layer of the sintered beads, it
was detected within the porous space, and it had penetrated the porous
space to a depth of at least one bead diameter. All eight components had
some bone growth into the porous space. A mean of 35 per cent of the
surface of the implants had bone ingrowth. In the areas where bone was
present, 67 per cent of the available porous space on the extensively
coated stems and 74 per cent on the proximally coated stems contained bone.
With both types of implants, the greatest amount of compact bone ingrowth
was found at the level where the porous coating ended. Transverse sections
obtained at this level frequently demonstrated that bone ingrowth had
occurred circumferentially and that the ingrowth was continuous with and an
integral part of the femoral cortex. These direct connections to the cortex
could be predicted from the appearance of the radiographs. In the most
proximal transverse sections of both types of implants, bone was most
frequently connected to the medial side and corners of the
implant.(ABSTRACT TRUNCATED AT 250 WORDS)
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