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  DTFLOCK thread technology can be used in an artificial knee joint. The artificial knee joint will subject to millions of cyclic load each year. The implanted artificial knee joint must be designed to withstand such load. If the artificial knee joint become loose, it must be retightened, which means another agonizing surgical operation. In order to prevent loosening of the connection fastener, medical doctors discarded bolt glue which may bring chemical harm to human and nylon inserts which may be damaged upon high temperature sterilization before operation, and finally determined to use DTFLOCK threaded fastener. Countless fatigue tests showed that: torque locking nut became loose after testing under cyclic load, while DTFLOCK thread demonstrated no loosening during long test duration under harsh environment.