Joint hypermobility syndrome, commonly known as biarticular syndrome, can be a common but underrecognized disorder in adults that is difficult to diagnose and often mistaken for fibromyalgia or other conditions.
So said Matthew B. Carroll, MD, board certified rheumatologist at Singing River Health System, Ocean Springs, Mississippi, during a presentation on hypermobility at the American College of Physicians San Diego 2023 Annual Internal Medicine Meeting.
According to Carroll, the concept of dual joint hypermobility spectrum disorder (HSD) is relatively new and is not part of the accepted nomenclature.
“One of the frustrations with HSD is that there aren’t really any good theories” as to why some people with hypermobility get the syndrome and others don’t, Carroll said.
Hypermobility is determined by the presence of joints who are freer than usual. Examples of this include excessive extension of the forearm at the elbow or pressing the thumb against the surface of the forearm.
About 20% of the adult population has hypermobility that affects women more often than men and is more common in younger people. In children aged 3 to 19 years, 32% girls and 18% of boys are hypermobile.
But this condition is not a diagnosis, “it’s a description of a finding that you notice on a physical examination,” Carroll said.
When flexibility is a problem
Although hypermobility is often benign and rarely leads to more serious health problems, HSD can cause symptoms such as recurrent dislocations, joint pain, and other degenerative changes. Recent evidence suggests that hypermobility may also be accompanied by abnormal bleeding.
A 2013 survey in the United Kingdom found that about 3% of respondents reported pain due to their hypermobility. Carroll hypothesized that up to a quarter of people diagnosed with hypermobility have some associated pain.
“We kind of think of hypermobility as either a benign behavior or you have it as a kid and grow out of it,” Carroll said. “But the reality is that many of our patients retain this into adulthood and may have problems as a result.”
Because some of the symptoms of HSD, such as abdominal pain and fatigue, mimic other pain sensations throughout the body, especially fibromyalgia, Carroll said it’s probably underdiagnosed.
“I think a lot of these patients have been diagnosed with fibromyalgia,” Carroll said. “We need to start looking into some of these nuances, or at the very least ask a rheumatologist to help you and others figure out where you can go with these patients and their health.”
Causes of GDM
HSD can be both genetic and environmental in nature; You should also consider sports injuries, spontaneous dislocations and fear of injuries leading to a sedentary lifestyle. The state may overlap with Ehlers-Danlos syndromesa rare group of hereditary conditions that affect tissue connectivity.
The management of patients with HSD requires a multidisciplinary approach, including primary care, rheumatology, genetics, and orthopedics. If primary care physicians suspect that their patient has hypermobility, they should investigate this possibility before moving on to another diagnosis. Determination of the presence or absence of joint mobility in an adult through a series of simple questions:
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Can you bend your thumb to touch your forearm?
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As a child, did you entertain your friends by giving your body weird shapes?
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Do you consider yourself two-faced?
“It gets very confusing and it’s really hard to understand, but I think it’s something that takes time in an iterative process to understand,” Carroll said.
Treatment options for HSD are limited. There are no pharmacological agents available to treat diseases, and interventions in general lack rigorous research to support their use. Carroll recommends anti-inflammatory drugs and physical therapy as first line approaches. He also emphasized that lifestyle changes, especially exercise and weight loss, are essential. The role of surgery is currently unclear and is used only in extremely select cases. An appointment with a geneticist may also be necessary to review family history and identify Ehlers-Danlos syndromes.
“You’re going to need several different specialists to try and really help our patients get back to normal,” he said.
Carroll reported no relevant financial relationship.
2023 American College of Physicians (ACP-IM) Internal Medicine Meeting Submitted April 28, 2023
Robert Fulton is a journalist based in Los Angeles.
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