Lab study points to ultrasound as possible aid after joint injury
UAH researchers found low-intensity ultrasound shifted immune-cell activity in lab tests toward repair, a possible step toward limiting post-injury arthritis.
By Tom Brennan · Health & Medicine Correspondent
3 min read
Researchers at The University of Alabama in Huntsville report that continuous low-intensity ultrasound changed immune-cell behavior in laboratory tests in ways that may support joint repair. The finding matters because persistent inflammation after joint trauma can contribute to post-traumatic osteoarthritis, according to the UAH team.
The study, published in Scientific Reports, examined macrophages, immune cells involved in both clearing damage and helping tissue recover. UAH said the work suggests a possible non-drug, non-invasive route for influencing the inflammatory response after joint injury, though the approach has not yet been tested in animals or patients.
How the treatment was studied
The research was led by Anuradha Subramanian, a professor of chemical and materials engineering at UAH, with biological research by Shahid Khan during his doctoral studies and computational and statistical analysis by Satyaki Roy, a professor of mathematical sciences. Graduate student Owen Trippany also contributed, according to UAH.
The team focused on two broad macrophage states described by the researchers. M1 macrophages are associated with inflammatory defense after injury, while M2-like macrophages are associated with tissue repair and recovery, according to Subramanian.
UAH said prolonged M1 activity can help create a chronic inflammatory environment that damages healthy tissue and contributes to post-traumatic osteoarthritis. The researchers tested whether continuous low-intensity ultrasound could push macrophages away from that inflammatory profile and toward a more reparative one.
A model meant to resemble injured joints
To better approximate what happens after joint damage, the researchers used fibronectin fragments, which UAH described as molecules produced when damaged tissue breaks down. The team used that method rather than relying only on standard lab techniques for provoking inflammation.
The study also used transcriptomics, which measures gene activity across cells, along with a computational method called differential clustering. Roy said the method allowed the team to look at coordinated changes among groups of genes after ultrasound exposure, rather than treating each gene separately.
According to the paper, continuous low-intensity ultrasound reduced markers tied to inflammation and increased markers associated with an M2-like macrophage state. UAH said those changes point to a more repair-oriented immune response in the lab model.
Early-stage work
The researchers cautioned through UAH that the findings remain early. The work was limited to laboratory experiments, and the team has not shown that the treatment prevents osteoarthritis in living joints.
Subramanian said the next phase will test the findings in animal models of early post-traumatic osteoarthritis and examine whether ultrasound-based immune modulation affects longer-term repair after joint injury. UAH said the National Institutes of Health funded the work through an R01 grant awarded to Subramanian.
The study, titled “Continuous low-intensity ultrasound influences the transcriptomic profile in M1 macrophages by downregulating inflammation and promoting M2-like markers,” was authored by Khan, Trippany, Subramanian and Roy. It was published in Scientific Reports in 2026 with DOI 10.1038/s41598-026-53228-6.
This story draws on original reporting from ScienceDaily.