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Review Question - QID 7148

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QID 7148 (Type "7148" in App Search)
A well-healed bulk proximal tibia osteoarticular allograft is removed 10 years after implantation due to arthropathy. Histologic examination of the host allograft junction site will most likely reveal

bridging external callus along the allograft and perpendicular callus at the junction site.

35%

152/440

direct osteonal penetration of the allograft with haversian remodeling.

22%

97/440

complete incorporation of the allograft with obliteration of the host allograft junction site.

23%

103/440

fibrovascular invasion with absence of callus formation.

12%

52/440

gap formation with resorption of the allograft surface.

7%

29/440

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Retrieval studies of well-fixed bulk allografts reveal that the junction site heals with bridging external callus and there is persistence of callus perpendicular to the junction site. External callus is annealed to the surface of the allograft. There is very little penetration of the allograft and the bone graft is not remodeled. Direct osteonal penetration of the allograft with haversian remodeling defines primary bone healing seen in fractures, which does not occur with allografts. Fibrovascular tissue is seen early in the healing phase of the cancellous portion of the allografts.

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