Don't worry about Poser.  There's too many figures in Poser, each with different heights.  One of the most popular figures out right now for Poser users isn't actually in Poser.  Victoria is the name of the female character that most Poser users use.  Michael is the male version.  Victoria 6 is the latest incarnation of that character, and it's a mesh created and distributed by Daz3d.com.

If you want to model something to a scale that will fit most Poser characters, I think your best bet is to download the free Daz Studio application, which comes with a universal figure they call Genesis.  Genesis is the base model that Victoria and Michael characters are based on now, so you can use that as a way to compare the height of your cane to a Poser compatible character.  Be warned, Daz Studio is a big download, and has a content manager that also installs with it, which runs in the background whenever you open the software.

---

Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.