Are there any knockoutjs page/routing frameworks?
Pager.js – URL routing framework built especially for work with Knockout.js.
See this Demo to know its full power and flexibility. IMHO, it far exceeds PathJS and Sammy.
Using PathJs also has some Sammy which is much of a framework. Neither of these are KO specific.
A highweight but KO optimized solution would be Knockback.
Durandal is an good SPA framework for Knockout.