Contorta’, commonly called contorted filbert, corkscrew hazel or Harry Lauder’s Walking Stick, is a contorted version of the species plant Corylus avellana.  Corylus avellana is commonly called European filbert, European hazelnut or cobnut, is a deciduous, thicket-forming, multi-trunked, suckering shrub that typically grows to 12-20’ tall. Contorta should only grow to 8-10’ tall, and  has twisted and spiraling branches, twigs and leaves. Your Contorta’ plants was grafted to Corylus avellana so the root suckers lack contortion. Such suckers cannot be used for propagation and must be regularly removed to prevent partial reversion of the plant to the uncontorted characteristics of the Corylus avellana root stock. The picture of the tree does not show the usual amount of twisting and spiraling of the  Contorta cultivar.  The new Harry Lauder’s Walking Stick stock is often grown on its own root stock so reversion to Corylus avellana does not occur.

https://hort.extension.wisc.edu/articles/eastern-filbert-blight/

 http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=c360

 https://ag.purdue.edu/btny/ppdl/Pages/POTW_old/12-19-11.html