The assembly has an ancillary with proximal humeral epiphysis of a humerus (H) in a monoblock cylinder for storing a bone material, where the cylinder is extended in length around an axis inclined with respect to a longitudinal direction of the humerus. A humeral epiphysis cutting ancillary cut the cylinder in transversal manner at the axis. The cutting ancillary releases the cylinder from the humerus such that the cylinder constitutes a transplant (2). A ring protects a side face (20) of the transplant, where the ring covers hydroxyapatite and includes a porous surface or honeycomb.
