## 3 Results
### Wettability Results  
The wettability apparent angle measurements, for each femoral head, are shown in Tables 1 and 2. In particular, Table 1 gives the wettability angles of the femoral heads explanted.  
Table 2 gives the wettability angle for each new and in vitro femoral head.  
Figure 5 shows the comparison of the mean value of the measured wettability angles for each examined category; we highlight the higher wettability angle of brand new Biolox(r) Delta head surfaces compare to the in vitro tested and explanted femoral heads which allow us to assert a general wear contribution on the wettability of the hip surfaces.  
Regarding the observed MT, it was found that there was a greater mean MT area percentage in the case of Biolox(r) Forte (5.7%) compared to Biolox Delta retrievals (4.9%).  
\begin{table}
\begin{tabular}{r c c c c c c c c} \hline \hline \multirow{2}{*}{**Heads**} & \multirow{2}{*}{**Material**} & \multirow{2}{*}{**Wettability Angle (\%)**} & \multirow{2}{*}{**MT Area**} & \multirow{2}{*}{**\% MT Area**} & \multirow{2}{*}{**Heads**} & \multirow{2}{*}{**Material**} & \multirow{2}{*}{**Wettability Angle (\%)**} & \multirow{2}{*}{**MT Area**} & \multirow{2}{*}{**\% MT Area**} \\  & & **Angle (\%)** & & & & & & **Angle (\%)** & **Area** \\ \hline
**\#01** & Biology® Forte & 39 & 88 & 11 & **\#13** & Biology® Forte & 45 & 30 & 4 \\
**\#02** & Biology® Forte & 43 & 90 & 11 & **\#14** & Biology® Delta & 40 & 41 & 5 \\
**\#03** & Biology® Forte & 38 & 127 & 16 & **\#15** & Biology® Delta & 40 & 48 & 6 \\
**\#04** & Biology® Forte & 40 & 161 & 20 & **\#16** & Biology® Delta & 46 & 85 & 11 \\
**\#05** & Biology® Forte & 42 & 235 & 29 & **\#17** & Biology® Delta & 37 & 86 & 11 \\
**\#06** & Biology® Forte & 45 & 412 & 51 & **\#18** & Biology® Delta & 50 & 107 & 13 \\
**\#07** & Biology® Forte & 44 & 128 & 16 & **\#19** & Biology® Delta & 55 & 128 & 16 \\
**\#08** & Biology® Forte & 43 & 86 & 11 & **\#20** & Biology® Delta & 43 & 138 & 17 \\
**\#09** & Biology® Forte & 54 & 30 & 4 & **\#21** & Biology® Delta & 51 & 154 & 19 \\
**\#10** & Biology® Forte & 56 & 95 & 12 & **\#22** & Biology® Delta & 47 & 219 & 27 \\
**\#11** & Biology® Forte & 43 & 239 & 30 & **\#23** & Biology® Delta & 42 & 309 & 38 \\
**\#12** & Biology® Forte & 42 & 286 & 36 & **\#24** & Biology® Delta & 43 & 574 & 71 \\ \hline \hline \end{tabular}
\end{table}
Table 1: Wettability angles of the femoral heads explanted.  
\begin{table}
\begin{tabular}{r c c c c c} \hline \hline \multicolumn{1}{c}{**Wettability Angle for Each New Femoral Head**} & \multicolumn{2}{c}{**Wettability Angle for Each In Vitro Wear Test**} \\  & & & \multicolumn{2}{c}{**Formal Head**} & \\ \hline
**N. Femoral** & **Material** & **Wettability Angle (\%)** & **N. Femoral** & **Material** & **Wettability Angle (\%)** \\ \hline
**\#25** & Biolox® Delta & 43 & **\#34** & Biology® Forte & 62 \\
**\#26** & Biolox® Delta & 39 & **\#35** & Biology® Forte & 56 \\
**\#27** & Biolox® Delta & 56 & **\#36** & Biology® Forte & 33 \\
**\#28** & Biolox® Delta & 33 & **\#37** & Biology® Forte & 56 \\
**\#29** & Biolox® Delta & 52 & **\#38** & Biology® Forte & 52 \\
**\#30** & Biology® Delta & 60 & **\#39** & Biology® Forte & 39 \\
**\#31** & Biolox® Delta & 34 & **\#40** & Biology® Forte & 34 \\
**\#32** & Biolox® Delta & 56 & **\#41** & Biology® Forte & 49 \\
**\#33** & Biolox® Delta & 48 & **\#42** & Biology® Forte & 45 \\  & & & & **\#43** & Biology® Forte & 40 \\  & & & & **\#44** & Biology® Forte & 38 \\  & & & & **\#45** & Biology® Forte & 35 \\  & & & & **\#46** & Biology® Forte & 35 \\  & & & & **\#47** & Biology® Forte & 24 \\  & & & & **\#48** & Biology® Forte & 33 \\  & & & & **\#49** & Biology® Forte & 46 \\  & & & & **\#50** & Biology® Forte & 43 \\  & & & & **\#51** & Biology® Forte & 42 \\  & & & & **\#52** & Biology® Forte & 46 \\  & & & & **\#53** & Biology® Forte & 48 \\ \hline \hline \end{tabular}
\end{table}
Table 2: Wettability angle for each new and from in vitro wear test femoral head.