Boerhavia diffusa (commonly known as Punarnava) has a long history of use in traditional systems of medicine such as Ayurveda, where it is valued for its purported anti-inflammatory, analgesic, and diuretic properties. In Ayurveda, Punarnava is traditionally regarded as a "rasayana" herb, believed to rejuvenate the body and aid in the management of inflammatory conditions, including those affecting the joints, such as arthritis and gout. The root and aerial parts are often used in formulations meant to alleviate joint pain, swelling, and stiffness.

The traditional claims are supported mainly by anecdotal evidence and centuries of empirical use. There are a few preclinical studies suggesting that extracts of Boerhavia diffusa may exhibit anti-inflammatory and immunomodulatory effects in animal models, which could theoretically benefit joint health. However, robust clinical evidence in humans is lacking. Most of the available scientific studies are either in vitro or in vivo (animal studies) and do not directly correlate to well-designed human clinical trials for joint health specifically.

In summary, while Boerhavia diffusa is justified by tradition for supporting joint health, and there are some preliminary pharmacological indications, the overall scientific evidence remains limited. Its use for joints is thus primarily based on traditional knowledge rather than strong scientific validation.