Fig. 2

Histological sections of the tendon graft–bone interface at 4 weeks after ACL reconstruction using CaP-hybridized tendon grafts in rabbits. a Soft tissue remaining in the bone tunnel after biomechanical testing (H-E staining; ×40). b Direct bonding area at the tendon graft–bone interface (H-E staining; ×100). c Indirect bonding area at the tendon graft–bone interface (H-E staining; ×100). Fibrous connective tissue is visible between the tendon graft and the bone. d Area of red safranin-O-stained GAGs in the cartilage layer at the tendon graft–bone interface (×40). T tendon graft, B bone, F fibrous connective tissue, C cartilage layer