Tree Arthritus?

[Demo]

I have been noticing over some time I come across some trees of all species but mostly hard woods. That grow in an unusaul way, all of a sudden the branch will stop its normal path of growth and take a sharp 90 degree turn. I was in an Oak and it was so bad I couldn't Possibly make a cut that we would be able to run through our chipper(I like to be nice to the groundie) And the chipper I run Is a Morbark 2400 xl The biggest in the company. I have never gotten a straight answer to my questions on why. At first I thought it was from aggresive pruning, but there normally arn't any scars or calasing. Does anybody know what causes this?

 

[Tom Dunlap]

Pictures?

I've seen branches that were bent when another limb broke and laid on the first one. When the broken limb is taken away the first has taken on the memory.

 

[Demo]

Next time I see one I will get a picture. But this is more like all the branches not just one or two. I normally dont know the job site I am going to till that morning so I cant plan to bring the camera.