Let H and H′ be a complex Hilbert spaces. For $p\in(1,
\infty)\backslash{2}weconsidertheBanachspaceC_p(H)ofallp−SchattenvonNeumannoperators,whoseunitsphereisdenotedbyS(C_p(H)).Weprovethateverysurjectiveisometry\Delta: S(C_p(H))\to
S(C_p(H’))$ can be extended to a complex linear or to a conjugate linear
surjective isometry T:Cp(H)→Cp(H′).