You’ve probably seen infomercials claiming that magnetic bracelets can relieve numerous conditions, from arthritis to headaches.

Although such medical claims are questionable, magnets are indeed useful tools for diagnosing pain and disability. And for an increasing number of equine veterinarians and their clients, the diagnostic compass is pointing to magnetic resonance imaging, or MRI.

When X-rays and ultrasound fall short, MRIs provide cross-sectional images that can pinpoint the source and severity of lameness. Just as importantly, MRIs can confirm what isn’t wrong. The results mean better lameness diagnosis, more treatment options, and an earlier return to normal function.

Because of the high price tag, MRI technology is used most often in high-performance racing horses, but companion horses can also benefit.