Rapid Prototyping for In Vitro Knee Rig Investigations of Prosthetized Knee Biomechanics: Comparison with Cobalt-Chromium Alloy Implant Material

Table 3

Descriptive statistics of the friction coefficients with standard deviation of the tested material combinations at different axial loads (axial pressure).

Axial load (pressure)	SPM versus UHMWPE	RPM versus UHMWPE	SPM versus PTFE	RPM versus PTFE
500 N (3.1 MPa)	0.099 ± 0.015	0.130 ± 0.035	0.063 ± 0.005	0.059 ± 0.011
750 N (4.7 MPa)	0.093 ± 0.025	0.111 ± 0.034	0.053 ± 0.005	0.044 ± 0.011
1000 N (6.2 MPa)	0.080 ± 0.018	0.091 ± 0.029	0.043 ± 0.004	0.036 ± 0.010
1250 N (7.8 MPa)	0.073 ± 0.020	0.078 ± 0.025	0.038 ± 0.004	0.030 ± 0.008
1500 N (9.4 MPa)	0.065 ± 0.017	0.065 ± 0.021	0.032 ± 0.003	0.026 ± 0.005