Doshic imbalance caused by lifestyle related factors results in decrease of our digestive fire. This results in creation of toxins called ama in our body which are carried by Vata to colon. Then from colon these travel throughout our system. When these toxins lodge in the bone tissue, it leads to arthritis.
Ayurveda tries to take this ama (toxins) from bones, bring it to colon and eliminate it. That is why talking triphla at night is recommended to anyone suffering from arthritis to help clean toxins from the body. Although, more specific treatments are recommended if one understand the type of their arthritis.
References:
Primary Reference: The Complete Book of Ayurvedic Home Remedies - Vasant D Lad - Part 3
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