The Xtensor hand exerciser addresses the cause of the problem by using the muscles that attach to the injured tendons as pumps to drive blood to the region. 

This increased blood flow helps stimulate the healing process which deliver the 
necessary nutrients required for healing while also strengthening the muscles 
and tendons that are repetitively overused making them more able to handle the 
repetitive stress from casting, flipping and casting.
The Xtensor hand exerciser addresses the cause of the problem by using the 
muscles that attach to the injured tendons as pumps to drive blood to the region. 

This increased blood flow helps stimulate the healing process which deliver the 
necessary nutrients required for healing while also strengthening the muscles 
and tendons that are repetitively overused making them more able to handle the 
repetitive stress from casting, flipping and casting.