It's rare for a medical condition to have its sub-types reclassified. It happened to autism a couple of years ago and there was uproar as people were worried they would lose their diagnosis.
It's now happened to another condition that also affects me and my sons, the rare disease, Ehlers-Danlos syndrome. Although The EDS Society patient group was involved in the change process, there is naturally concern among patients about what the changes mean. So, as I'm UK and Europe Advisor for The Ehlers-Danlos Society, I thought I would write this post to help, with links to the sources to find more information. I also know a fair number of our readers and their children have this or a related condition or have long-sought a diagnosis. It seems, anecdotally, to be a condition that some children with autism can be prone to.
What's in a name?
Ehlers-Danlos syndrome is a connective tissue disorder described by the world expert, Professor Rodney Grahame, as one of the most neglected disorders in the history of modern medical management.
Like autism, EDS is a spectrum disorder, in that within the umbrella of “Ehlers-Danlos syndrome” are different classifications and different levels of severity within each type. Up until now, if you have Hypermobile EDS (hEDS) like me, you could be diagnosed with EDS-Hypermobility Type, Hypermobility EDS or EDS Type III and it was thought that it was the same condition as Joint Hypermobility Syndrome (JHS). All very confusing.
And that’s just one type of Ehlers-Danlos.
But now, the world’s leading specialists in EDS have worked together with The EDS Society, to clarify the criteria for a diagnosis on the different types.
There are a number of different types, some ultra-rare and some life-threatening. Even the less rare type can mean the patient dislocates joints, bruises easily, suffers great fatigue and chronic pain. It is not unusual for the EDS patient to need a crutches or a wheelchair or have co-morbidities that need surgery or tube-feeding. Again, like autism, don't think that just because you've met one person with Ehlers-Danlos, you know what the condition can be like for another person with the same diagnosis.
Yesterday, The Ehlers-Danlos Society’s Lara Bloom and EDS expert and Geneticist, Dr Clair A Francomano, held a webinar to explain the new classification system. A supplement of 18 new medical papers supporting the new classifications is also being published and I'll link them here as soon as they are available. For the next three months following publication, the supplement will be available for free download from the EDS Society website and after that, each paper will be available singly. It is vital that patients download these and print or email them to their GP, consultant, physio, specialist or any other medical professional they know.
It's hoped the papers should also make swifter and more accurate diagnosis possible as, armed with the criteria, patients will not have to be on a long waiting list to see one of the few EDS specialists or fork out, as I did, to be seen quicker - if they can afford it.
The EDS Society has published a comprehensive set of FAQs about the changes covering all the types and co-morbidities (and why the new classifications do not cover these related disorders yet) You can download this here.
The new EDS classes
You can see the new classifications in the image below. AR means autosomal recessive; AD means autosomal dominant.
(Autosomal dominant: An affected individual has one copy of a faulty gene and one normal gene on a pair of autosomal chromosomes and have a 50-50 chance of passing the mutant gene to a child. Autosomal recessive means the individual has two copies of the faulty gene, one copy from each carrier parent. The parents do not exhibit the trait because the gene is recessive to its normal counterpart gene. In this case, there is a 25% chance of a child inheriting both abnormal genes and, consequently, developing the disease.)
Visit this page on the EDS Society website for lots more information on the new classifications for ALL types
Hypermobile EDS: hEDS
This is a broad subject and, for brevity, I’m only addressing the most prevalent type of hEDS as this is where most of the clarifications have taken place. It’s previously been something of a subjective diagnosis, depending on which doctor you saw, because the gene that causes Hypermobile EDS has not yet been discovered. This means a clinical examination and history has always been relied upon to make a diagnosis along with various scales and scores. Therefore, a doctor not necessarily expert in EDS could easily give an incorrect diagnosis either way.
Does everyone who is hypermobile have hEDS? In short, no. Just because you’re a bit bendy does not mean you have the condition, otherwise we would be including gymnasts, dancers and all sorts of very fit and well people. That’s not to say none of these people have EDS, but if they are living pain-free and are otherwise very healthy, they are unlikely to have, or require, a clinical diagnosis.
The new classifications also shows that hEDS and Joint Hypermobility Syndrome are NOT the same thing as had been previously supposed. This doesn’t mean that JHS can be safely ignored – it is just as important, still needs to be treated for its symptoms with good patient care. It’s just a different diagnosis to hEDS and will be known as Hypermobility Spectrum Disorder.
“This publication is a game-changer for the Ehlers-Danlos community,” says Dr. Clair Francomano, Geneticist and Director of the Ehlers-Danlos Society Center for EDS Research and Clinical Care, and a co-author of the publication. “Up to this point, research into the Ehlers-Danlos syndromes has suffered from a lack of coordination and much of it has been based on outdated and incomplete diagnostic criteria. Moreover, clinical care for these patients has been compromised because physicians and other health-care professionals are generally not familiar with the wide range of manifestations and co-morbidities that may be seen in these conditions..."
The diagnostic challenge
Because of the reliance on a clinical examination and history, misdiagnosis or missed diagnosis is always a danger. To make this less likely, the criteria have been tightened up and more clearly spelled out as below.
One major change: The previous classification systems, Villefranche and Brighton, will no longer apply. The Beighton score remains as the first criterion.
Criterion One: Generalised Joint Hypermobility
1. Using the Beighton Score [See here for a description of the Beighton Score which measures degrees of hypermobility]
|Children & adolescents||= or > 6|
|Adults and young people post-puberty up to 50||= or > 5|
|Adults over 50||= or > 4|
2. 5-point Questionnaire
- Can you now (or could you ever) place your hands flat on the floor without bending your knees?
- Can you now (or could you ever) bend your thumb to touch your forearm?
- As a child could you contort your body into strange shapes or do the splits?
- As a child or teenager did your shoulder or kneecap dislocate on more than one occasion?
- Do you consider yourself to be double-jointed?
To be a positive score there needs to be at least TWO ‘yes’ answers from the above. If the Beighton score is ONE point under the cut off for the age, and there is a positive score from the above 5PQ, a diagnosis of Generalised Joint Hypermobility can be made.
Criterion 2: TWO or more of the following features:
A: Systemic manifestations of a more generalised connective tissue disorder
B: Positive family history
C: Musculoskeletal complications.
What do these mean? Scroll through the slides below to see definitions of A, B and C
Criterion 3: All prerequisites required:
- Absence of unusual skin fragility, which should prompt consideration of other types of EDS
- Exclusion of other heritable and acquired connective tissue disorders, including autoimmune rheumatologic conditions
- In patients with an acquired/autoimmune connective tissue disorder, additional diagnosis of hEDS requires meeting both features A and B of Criterion 2. Feature C of Criterion 2 (chronic pain and/or instability) cannot be counted towards a diagnosis of hEDS, as they are also features of other conditions
- Exclusion of alternative diagnoses that may also include joint hypermobility by means of hypotonia and/or connective tissue laxity.
So this is something concrete that you can download and print. You can see the slides from the webinar here.
So what if your child doesn’t meet this new criteria?
First of all, if you or your child already have a diagnosis of EDS, it won’t be taken away. If you want to seek a new diagnosis, of course you can. The new system does, however, separate out hEDS and hypermobility spectrums. It doesn't mean one is more important than the other, it is just a more accurate classification for diagnosis so those without all the symptoms can still receive a diagnosis and not be fobbed off.
Those not meeting the stricter criteria for hEDS can be diagnosed with Hypermobility Spectrum Disorder, or HSD (which may include those with JHS). As well as including those with symptomatic joint hypermobility that don’t meet the full criteria, HSD can apply to those with asymptomatic hypermobility (i.e., doesn’t cause problems); hypermobility that is Localised (L-HSD), Generalised (G-HSD) or Peripheral (P-HSD); and those with a well-defined syndrome with joint hypermobility. Also, H-HSD – a person who may have been hypermobile in the past but not now but who has musculoskeletal problems.
See this EDS Society slide for this explained in combination with the Beighton score and MSK involvement
|Type||Beighton Score||Musculoskeletal Involvement||Notes|
|Asymptomatic PJH||Usually Negative||Absent||JH typically limited to hands and/or feet|
|Asymptomatic LJH||Negative||Absent||JH limited to single joints of body parts|
|P-HSD||Usually Negative||Present||JH typically limited to hands and/or feet|
|L-HSD||Negative||Present||JH typically limited to single joints or body parts|
|H-HSD||Negative||Present||Historical presence of JH|
The message is that everyone should take these different diagnoses seriously –they are real and can diagnose the HSDs that do not meet the full EDS criteria – it’s not less, it’s more inclusive different diagnosis and different care
What about co-morbidities?
The new system doesn’t go into detail about some of the many co-morbidities such as gastroparesis, Chiari Malformation, Mast Cell Activation Disorder, Tethered Cord and so on that are often seen with EDS patients.
There is a reason for this: clarity of evidence for a direct association. To gather reliable evidence needs research and research costs money.
So this is not to say that these conditions do not go hand in hand and make up a very real and disabling part of EDS conditions. We all know that, anecdotally, they do. It’s just that this is a first step at classifying a complex condition and other parts will follow when the research has been done to establish sufficient evidence to be included in guidelines.
The EDS Society
I hope these new classifications will be of great help to patients and doctors alike and you can help by sharing this post, the webinar and the booklet some or all of the new medical papers being published (I will include links here when they are available)
The EDS Society, only formed under a year ago from the former US-based non-profit EDNF to expand it into a global organisation and credit goes to my colleague, Lara Bloom who herself has EDS and yet has travelled a lot of the world working on making the EDS "invisible, visible".
Lara and The EDS Society are also working on updating the criteria for the ICD10 medical diagnostic information. Other work includes a huge project working on an EDS Registry, working with the World Health Organisation on EDS and with other UK charities to get official guidance from NICE for treatment protocols. Do donate to help fund this work and EDS research, if you can.
- Q and A: http://ehlers-danlos.com/wp-content/uploads/QandA-2.pdf
- New classification press release
- Supplement on American Journal of Medical Genetics Part C: Seminars in Medical Genetics (free for a limited time, after which, download them in pdfs from The Ehlers-Danlos Society site here
- You can see the whole webinar here
- You can see the slides from the webinar here.
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