Designing a simpler way to diagnose gout

Gout is a debilitating condition caused by the buildup of monosodium urate (MSU) crystals in the joints, which causes swelling and pain. The current standard diagnosis method for gout involves collecting a sample of joint synovial fluid and analyzing it under a microscope to identify these crystals. However, this method is invasive, painful for the patient, and requires a trained expert to perform.

Takeuchi et al. developed a noninvasive method to identify the presence of MSU crystals, using an applied magnetic field and infrared light emitter. Their approach could make diagnosing and treating gout faster and easier.

During testing, the authors discovered that MSU crystals orient in the presence of a magnetic field.

“Despite being diamagnetic, MSU crystals respond well to magnetic fields even below 0.5 Tesla,” said author Yuka Takeuchi. “Upon discovering this, we envisioned developing a device for the non-invasive detection of MSU from outside the body using magnetic fields.”

First, the researchers needed to confirm that this magnetic orientation happens even in the tight confines of joints. To do this, they built a bone model with a joint cavity and filled it with MSU crystals suspended in solution. They found that the crystals do orient in this tight space, and that their orientation time is unaffected by the close quarters.

To detect this orientation, the authors used a near-infrared light source, which penetrates tissue. An adjacent detector can measure changes in reflectivity to identify the presence of the crystals in real time.

“Our long-term goal is to create a user-friendly device — similar to a blood pressure monitor — that allows patients to easily confirm treatment effects at home,” said Takeuchi. “We believe this will promote treatment adherence.”

Source: “Magnetic orientation of monosodium urate crystals in microspaces: Potential for gout diagnosis,” by Yuka Takeuchi, Takahiro Yamada, and Atom Hamasaki, AIP Advances (2026). The article can be accessed at https://doi.org/10.1063/9.0001003 .

This paper is part of the 70th Annual Conference on Magnetism and Magnetic Materials Collection, learn more here .