I cured it permanently with six months of exercise and a $20 blue Theraband.
Theraband FlexBar comes in only yellow, red, green, and blue. The blue is listed as heavy and I was reluctant to select it. But I am a fit 180 pounds 75 kilos and it was a good resistance for me. If you are more seriously injured or a smaller person you will want to go a bit lighter. Note that you will be twisting the bar, and the forces listed are for bending it in half.
•Thera-Band FlexBar is 12" long and is made from dry natural rubber in 4 progressive resistance levels to match user capability.
•The Yellow Thera-Band FlexBar takes 6 lb. of force to bend to a u-shape, Red 10 lb., Green 15 lb., and Blue 25 lb.