By Pat Anson, PNN Editor

Preliminary results from a small study show that an experimental treatment for adhesive capsulitis -- also known as “frozen shoulder” – dramatically reduces pain and quickly improves function in patients.

Frozen shoulder occurs when ligaments and connective tissues surrounding the shoulder joint become sore and inflamed. The inflammation gets so painful that many patients have difficulty using their arms. The resulting lack of use makes the shoulder joint even more stiff and inflamed – a vicious cycle that “freezes” the shoulder in place.

About 200,000 people annually in the U.S. develop frozen shoulder, mostly middle-aged adults. Several years ago, I was one of them. The pain was so bad at times, it felt like someone whacked me in the the shoulder with a baseball bat. I had trouble putting on a shirt or sleeping in the same position for more than a few hours.

Frozen shoulder is usually treated with physical therapy, massage, joint injections or pain medication, until the symptoms resolve in a few months or perhaps even years. Thankfully, that’s what happened to me. More serious cases can result in rotator cuff surgery.  

Researchers at the Vascular Institute of Virginia used a less invasive procedure called Arterial Embolization of the Shoulder (AES) to reduce blood flow into the shoulder of 16 patients with adhesive capsulitis. Physicians inserted a catheter through a pinhole-sized incision in the patients' wrists that was used to feed microscopic particles into six arteries leading into the shoulder.

"Patients with frozen shoulder are essentially told to tough it out until their symptoms improve, but considering the significant pain and decreased function many experience, we looked to determine if this treatment model of embolization, already in use in other areas of the body, could provide immediate and durable relief," said lead author Sandeep Bagla, MD, director of interventional radiology at the Vascular Institute of Virginia.

It may sound counter-intuitive, but decreasing the flow of blood into shoulder tissue significantly reduced the patients’ pain and inflammation.

"We were shocked at the profound and dramatic improvement patients experienced in pain and use of their shoulder," says Bagla. "We are early in the investigation of this treatment but are inspired by its effectiveness in reducing pain and range of motion in patients' shoulders."

The treatment was conducted on an outpatient basis and takes about one hour. Nine patients reported minor side effects such as skin discoloration.

The findings were recently presented in a research abstract during a virtual session of the Society of Interventional Radiology. The authors note that AES is still investigational and that conservative therapies for frozen shoulder should still be considered first.