1. A muscle pedicle permitted to remain attached to autogenous bone grafts in rabbits was effective in retaining viability of the contiguous bone.
2. The deeper areas of pedicled bone grafts, remote from the muscle pedicles, did not remain viable.
3. Fractures through the experimental bone grafts with muscle pedicles showed evidence of reparative osteogenesis in the region of the viable bone.
4. Control experiments without muscle pedicles revealed necrosis of the bone grafts.
5. Fractures of the control bone grafts showed no evidence of reparative osteogenesis.