A schematic drawing of the Bone Conduction Chamber (BCC). Frozen bone allografts are placed for 6 weeks in the chambers, which are implanted in the proximal tibia of rats. The openings at the lower end of the chamber are placed just below the periosteum. Tissue grows into these openings (arrows) and penetrates the whole of the graft. Ossification reaches about halfway from the bottom towards the top (dashed line). From Aspenberg P, Wang J-S. Eur J Exp Musculoskel Res. 1993;2:69–74. Published with permission from Taylor & Francis.