Речь идет о регенерации костной ткани при введении губчатых (cancellous) или кортикальных (cortical) трансплантатов (grafts).

Вот ссылки, какие нашла:

....донорская кость вначале служит своеобразным эндопротезом, затем постепенно заменяется родной костной тканью за счёт огромных компенсаторных возможностей человеческого организма. Так называемое "ползучее замещение".
http://www.litrossia.ru/litrossia/viewitem?item_id=17709

The clinical outcome of bone grafting procedures depends on many
factors, including type and fixation of the bone graft as well as the
site and status of the host bed. Bone grafts serve one or both of two
main functions, as a source of osteogenetic cells and as a mechanical
support. Autografts, both cancellous and cortical, are usually
implanted fresh and are often osteogenetic, whether by providing a
source of osteoprogenitor cells or by being osteoinductive. The latter
is a process whereby the transplanted tissue induces mesenchymal cells
of the recipient to differentiate into osteoblastic cells. Cortical
grafts, whether autogeneic or allogeneic, at least initially act as
weight-bearing space fillers or struts. All bone grafts are initially
resorbed, but cancellous grafts are completely replaced in time by
__creeping_substitution__, while cortical grafts remain an admixture of
necrotic and viable bone for a prolonged period of time. The
three-dimensional framework, which supports invasion of the bone
grafts by capillaries and osteoprogenitor cells, termed
"osteoconduction", is another important function of both autografts
and allografts. Fresh allografts are more slowly and less completely
replaced by host bones because they invoke both local and systemic
immune responses that diminish or destroy the osteoinductive and
conductive processes. Although freezing or freeze-drying of allografts
improves acceptance, their failure rate is still too high. These
processes are also influenced by the vascularity and composition of
the host bed. Thus, the interaction of the host and the bone graft
determines the success of these procedures, which ultimately is to
provide a mechanically efficient support structure.
http://www.nedug.ru/lib/lit/traum/wheeless/22-14.htm