We use 3 herbs for pain management, crampbark, willow bark, and Kratom
Crampbark for sore muscles.
Willow bark for mild to mod pain.
Kratom for moderate to severe pain.
I agree with Mike, there are quite a few over-hyped articles about Kratom. These take the "Reefer Madness" approach to the subject, and are typically just as factual as reefer madness.
We were introduced to Kratom last year when my husband broke his leg, a spiral fracture involving the top third of the tibia, just below the knee, with a torn tendon to go with it. Willowbark tincture was not enough to control the pain. A friend brought over a couple of doses of kratom for him to try. It worked to manage his pain and allowed him to remain clear-headed. He could still edit and do his sound mixing when on kratom, something he couldn't do when he took Vicodin, so we still had some income.
You will read that it is addicting, just like it's cousin, coffee, and in my experience, to a lesser extant. My husband took it daily for about 5-6 weeks while recovering. He had no symptoms of withdrawal when he stopped, not even a headache.
Different strains have slightly different properties. We keep 2 strains on hand. We don't need it everyday, but it is sure handy to have around when the need arises.
It is worthwhile looking into Kratom when pain is chronic or severe.
Do research it to seperate the hype from the facts.
If it is still legal in your state, you may want to try it.
Like Mike said, it is horridly expensive when buying locally and the quality may not be as good as one would like. ($1.00 each for 500 mg capsule at my local tobacco shop. 2 gm is my dosage, which would be 4 capsules.) I buy it over the internet and make my own capsules. It comes to around 10 cents each to make.