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Active osteoblasts were observed on the periosteal surface in H&E-stained cross sections of the loaded ulnar midshaft at 4 days. (Bottom) Cross sections of representative loaded ulnae at 1 day (left) and 4 days (right) (×5). (Top) Close-up images of the periosteal surface on the medial side of loaded ulnae at 1 day (left) and 4 days (right) (×40). Many active osteoblasts and osteoid were present on the bone surface at 4 days, which indicated that new bone was being formed.
