A method for constructing LDPC code in the mobile digital multimedia broadcast system is provided, wherein the Low-Density Parity-Check matrix of the LDPC code is iteratively constructed according to a code-table and expansion method, and the code-table is a part of the constructed Low-Density Parity-Check matrix. The implants are formed of tricalcium phosphate, an osteoconductive bone graft substitute and filler, which allows for simultaneous controlled absorption and promotion of osteogenesis. The shank is inserted in the eccentric bore and formed with a planar face.