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We calculate the angular and temperature $T$ dependencies of the uppercritical field $H_{c2}(\theta,\phi,T)$ for the $C_{4v}$ point group helical$p$-wave states, assuming a single uniaxial ellipsoidal Fermi surface, Paulilimiting, and strong spin-orbit coupling that locks the spin-triplet $\vec{\bfd}$-vectors onto the layers. Good fits to the Sr$_2$RuO$_4$$H_{c2,a}(\theta,T)$ data of Kittaka {\it et al.} [Phys. Rev. B {\bf 80},174514 (2009)] are obtained. Helical states with $\vec{\bf d}(\vec{\bfk})=k_x\vec{\bf x}-k_y\vec{\bf y}$ and $k_y\vec{\bf x}+k_x\vec{\bf y}$ (or$k_x\vec{\bf x}+k_y\vec{\bf y}$ and $k_y\vec{\bf x}-k_x\vec{\bf y}$) produce$H_{c2}(90^{\circ},\phi,T)$ that greatly exceed (or do not exhibit) thefour-fold azimuthal anisotropy magnitudes observed in Sr$_2$RuO$_4$ by Kittaka{\it et al.} and by Mao {\it et al.} [Phys. Rev. Lett. {\bf 84}, 991 (2000)],respectively.

Is the anisotropy of the upper critical field of Sr$_2$RuO$_4$ consistent with a helical $p$-wave state?