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Although Metal-On-Metal (MOM) Total Hip Prostheses (THP) with self directed balls have as their greatest advantage the replacement of the specific regular hip prostheses sliding movement between the femoral head and the acetabulum socket with the rolling movement between the balls, the socket and the femoral head, the lubrication side of the process is still not well known. Tests with balls on a flat rig showed maximum values for the friction coefficient of under 0.05 while studies ofdoi:10.15623/ijret.2014.0304015 fatcat:2ngow7cba5avfhaqvwpysq7eki