Sunday, August 18, 2019

Forearm Synostosis

The forearm typically has two bones, a radius and an ulna.  The benefit of having two bones is that it allows the radius to rotate around the ulna.  This means we can position the hand palm up and down.  This is functionally helpful but not functionally mandatory as there are many ways to make up for limited or absent forearm rotation.

One of the most common conditions that affects forearm rotation is a joining of the two bones- a radioulnar synostosis.  Developmentally, the bones just don't ever completely separate.  So the condition is present at birth but may not be picked up on until later.  If the forearm bones are stuck with the palm all the way down or up and if both right and left sides are both involved, it is more likely to be obviously at a young age.  However, if only one side is affected and if the forearm is fused in neutral (i.e., hand clapping position), the condition may not be diagnosed until 7-9 years of age or even later.

Here are a few older posts on the topic:
Radioulnar synostosis Post 1
Radioulnar synostosis Post 2

Here is a great kid explaining his radioulnar synostosis.  It affects only his left side.  There is NO pain.  His function is great but not perfect as you can hear him describe.  We are going to watch him for now.  If problems develop over time, there may be treatment but, as I explained to this family, we are unable to restore motion of the forearm.  He will no limitations with activities.




Charles A. Goldfarb, MD
My Bio at Washington University
email: congenitalhand@wudosis.wustl.edu

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Friday, July 5, 2019

Only a thumb. Amazing outcome!

A child with a single digit may have one of two primary diagnoses.  If there is a single digit
- most resembling a little finger, the diagnosis is likely ulnar deficiency
- most resembling a thumb, the diagnosis is symbrachydactyly

Other diagnoses affecting the fingers include amniotic band syndrome which typically affects the central digits and causes shortening of several digits with banding and possible scarring at the fingertips (fenestrated syndactyly).   Cleft hand also affects the central digits, most commonly causing an absent middle finger.  And, lastly, radial deficiency typically may cause a small or absent thumb.

Symbrachydactyly can present in multiple different ways- see my previous posts HERE.   In a patient with symbrachydactyly and only a thumb, the functional need is for a digit (post) to pinch against.  This post will make the hand the best possible helper hand for the normal opposite hand (the opposite hand is normal in symbrachydactyly).   Without this post, the function of the thumb, and therefore the hand, is limited.

This child is five years of age and was born with symbrachydactyly.  He had only a single digit, a thumb, on the left.  Because there was a reasonable soft tissue envelope at the index finger area, we elected to perform a nonvascularized toe graft.  The idea is to bring a phalanx from the foot and place it in the hand to lengthen the digit.  This is somewhat controversial as the phalanx may or may not grow after transfer.  I have previously blogged about it HERE. 

Here are a few pictures of this amazing child with symbrachydactyly.  The first set of pictures is before surgery and immediately after the toe transfer.

Symbrachydactyly with a soft tissue envelope but no bony support of the index finger

Symbrachydactyly with a soft tissue envelope but no bony support of the index finger

Symbrachydactyly after toe transfer.  The blue cap covers the pin stabilizing the transferred bone until healing.

Symbrachydactyly after toe transfer.  The blue cap covers the pin stabilizing the transferred bone until healing.




This next set of pictures is several years after surgery.  Note how good the index finger looks and how great a post it makes for the normal thumb.  The toe phalanx has clearly grown making a great finger!  The donor site is the 4th toe and it does not look great without the phalanx.  But, the foot causes no problems and the hand is better off after the surgery.
Symbrachydactyly post reconstruction of the index finger

Symbrachydactyly post reconstruction of the index finger

While the hand looks great with a longer index finger, the foot shows clear sign of the toe transfer.


Finally, here are two videos showing function.  The first demonstrates the dexterity of the thumb and reconstructed index finger after reconstruction.



The next video shows what a helpful prosthetic can do.  In this case, as the patient has tried to learn to ride his bike, he has struggled with only the thumb and index finger (later, these two digits will be enough for bike riding and most activities).  With a simple passive prosthetic, the fingers are essentially lengthened and riding the bike becomes no problem!  The prosthetic is great for riding but is not really worn at other times, especially given his overall outstanding function!


                                       

Please note: mom gave consent for me to include these videos and pictures.

Charles A. Goldfarb, MD
My Bio at Washington University
email: congenitalhand@wudosis.wustl.edu

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Wednesday, June 19, 2019

Severe Camptodactyly

Severe camptodactyly can be a challenge as it will limit function and may cause pain.  This is less common in childhood and more common for the adult with untreated camptodactyly.  I have previously shared thoughts on camptodactyly HERE.

Treatment of camptodactyly in the child begins with therapy.  Depending on the nature of the camptodactyly, this may be curative or may provide sufficient improvement to avoid the need for surgery.  Rhee, et al (including senior author Baek) showed how effective therapy can be, especially in the younger population MORE INFO HERE.  In those patients that remain with functional challenges after failing 3-6 months of therapy, surgery for camptodactyly can be helpful.  We have shared our approach in the Journal of Hand Surgery HERE..  We do not regularly perform a tendon transfer to power extension (straightening) as we fear the finger may be stiff and straight which is a bigger functional challenge than the finger that will not completely straighten. 

The concern with untreated, severe camptodactyly is the development of arthritis at the PIP with permanent stiffness and pain,  That, indeed, is how our patient presented.  He had isolated camptodactyly of the ring and small finger.  The fingers interfered with function given their severe flexion posture.  He did not have other medical conditions and requested surgical intervention.  Unfortunately, as might seem obvious, if there is arthritis, the option of providing additional motion through releases does not make sense.  Therefore we elected to proceed with fusion of the PIP joints in a better functional position with the idea that this would address the pain as well as improve function.
Xrays in severe camptodactyly

Severe camptodactyly of the ring and little fingers

Severe camptodactyly but with maintained flexion of the fingers.





















This patient underwent succesful fusion surgery.


PIP joint fusion for severe camptodactyly


I do not routinely push for surgery in camptodactyly.  I give families that option if therapy fails.  I explain why I think it will be helpful for function (and appearance).  But I never consider it mandatory.  This patient, and patients like him, illustrate the danger of untreated camptodactyly- that is- worsening posture which interferes with function and potentially arthritis at an early age which causes pain.  These risks should be made clear to those families hesitant to consider surgery for camptodactyly (when the patient has failed therapy).

Charles A. Goldfarb, MD
My Bio at Washington University
email: congenitalhand@wudosis.wustl.edu

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Saturday, June 8, 2019

Distal Arthrogryposis- thoughts and techniques for treatment

Distal arthrogryposis is defined as multiple contractures affecting the hands and feet.  This can include the thumb, fingers (camptodactyly) or clubfoot.  Our understanding of these conditions continues to expand and these sites each provide great information:
Rare Disease site
Genetics site
OMIM


While distal arthrogryposis may be lumped as a diagnosis, the diagnosis can also be subdivided into different types as the links above clarify including Type 1, Type 2B, Freeman Sheldon, and more.  Each type of distal arthrogryposis is somewhat different in presentation, genetics (including identified genes and inheritance pattern), and more.  The severity of involvement of the fingers, thumb, etc vary notably from type to type and patient to patient.  This is what make arthrogryposis patients so difficult to treat and so difficult to predict outcome from treatment.

I have previously posted several times on camptodactyly which means bent finger. 
Post 1
Post 2 and others as well.


The finger is bent through the PIP joint (first joint actually in the finger) and typically in arthrogryposis, can't be straightened. Therapy can absolutely be helpful and is always recommended as the first step.  But surgery might be helpful for function (especially if the bent finger is getting in the way of grasp).  Additionally, it has been suggested that when the finger is left untreated, arthritis can develop and joint deformity can become an issue.

The thumb is often a bigger functional issue due to its flexed position.  It makes large object grasp difficult and can also get in the way.  The function and position of the thumb is always important BUT becomes even more important in kids with severe finger limitations.  Those kids depend on a good thumb for most of their hand function.  I have previously posted on the thumb in arthrogryposis here:
Post 1
Post 2 and others as well.

This child is about 5 years of age.  The pictures do not present his challenges well (I am trying to take more video but...).  His middle finger is bent 90 degrees and stuck.  His thumb is very tight at the MCP joint and his a complex skin contracture as well.



Distal arthrogryposis with tight thumb and middle finger



Distal arthrogryposis.  First web space (thumb space) is tight!

Distal arthrogryposis with tight middle finger (can't be straightened) and tight thumb.

Given the functional limits caused by the distal arthrogryposis and primarily the thumb and middle finger, the family elected to proceed with surgery.  Therapy had provided some, but not enough improvement.  The thumb was flexed and could not be straightened.  The space between the thumb and pointer finger was very tight.  The middle finger was bent and could not be straightened.  

I have posted on different techniques which overlap with treatment here.  I recently posted on our treatment of camptodactylyCamptodactyly Post- and I treated this patient in a similar way.  I have also previously posted on the thumb.  However, in this case, I used a somewhat different flap to resurface and deepen the first web space.   This is a modification of the traditional Buck Gramcko flap for first web space reconstruction.  Abdel- Ghani has written about this and shared his positive results:



I also stiffened (a procedure called a chondrodesis) the thumb MCP joint to help keep the thumb in a better position.  I expect this child will do very well.

Distal arthrogryposis treated thumb and middle finger reconstruction

Distal arthrogryposis treated thumb and middle finger reconstruction


Distal arthrogryposis treated thumb and middle finger reconstruction

Charles A. Goldfarb, MD
My Bio at Washington University
email: congenitalhand@wudosis.wustl.edu

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Sunday, May 12, 2019

Short arm and hand deficiency- phocomelia or longitudinal deficiency?


Phocomelia is Greek for 'seal limb', a descriptive term for a short, deficient arm (or leg).  I have previously posted on this topic HERE.   For many years, patients with a really short arm were diagnosed with phocomelia as it became a 'wastebasket' term for such patients.  However, the term should be used in patients with an intercalary deficiency, that is, a deficiency primarily of one segment of the extremity (and NOT, for a generally short limb).  For example, a phocomelia could be a patient with a near normal humerus bone and a near normal hand without a forearm.  Or a near normal forearm and hand without a humerus.  Such patients are extremely rare today but the term and appearance became common nearly 60 years ago related to use of thalidomide by pregnant women.  

So, back to our focus- the really short arm and deficient hand.  Most commonly, this is NOT phocomelia but more likely is severe radial or ulnar deficiency.  We first identified and reported this connection in the medical literature in 2005, summarized HERE.  

Recently, I met a new adult patient with an undiagnosed left arm deficiency.  We had a long discussion about any diagnosis as well as her concerns that this may relate to her father's exposure to Agent Orange in Vietnam.  There is no evidence that I can find relating to any parental exposure.  But, her clinical appearance and the x-rays suggest a diagnosis of ulnar longitudinal deficiency.  I have written a good deal about ulnar longitudinal deficiency previously, found HERE.  There is also good additional information to be found on OrphanetOMIM including ulnar mammary syndrome (UMS), and others.

To me, making the correct diagnosis is important for many reasons.  One reason is simple- peace of mind.   Giving a name and diagnosis to a condition helps decrease anxiety around a condition.  It also provides information to the family.  Also, the correct diagnosis gives genetic information which may be important for future generations.  Finally, the right diagnosis helps identify other associated abnormalities of the skeleton or the key organs (like heart, lungs, etc).   In ulnar longitudinal deficiency, the main associated anomaly is trouble at the lateral ankle (distal fibula) and, very rarely, a severe deficiency of the hip.  There are not other regular conditions of the bones or key organs.  This is different than other similar conditions, like radial longitudinal deficiency, with known heart, spine, kidney, and other conditions.

This patient had an isolated condition with a very short left upper extremity without elbow motion.  Shoulder motion was also limited.  Also, there was a thumb and three fingers with some limited motion of the fingers as well.  

Appearance of ulnar deficiency.  Note the very short arm, lack of elbow motion, and missing finger.

Appearance of ulnar deficiency.  Note the very short arm, lack of elbow motion, and missing finger.
X-rays confirm the diagnosis of Type 5 ulnar longitudinal deficiency (also know as ulnar clubhand, ulnar hypoplasia, and ulnar amelia).



Type 5, severe, ulnar longitudinal deficiency.  Not the abnormal shoulder, lack of elbow, and missing finger.


Type 5, severe, ulnar longitudinal deficiency.  Not the abnormal shoulder, lack of elbow, and missing finger.

Charles A. Goldfarb, MD
My Bio at Washington University
email: congenitalhand@wudosis.wustl.edu

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Sunday, April 7, 2019

Symbrachydactyly- The typical form defined

I have posted a few times on symbrachydactyly and those posts can be found HERE.  In addition, there are several reasonable summaries at other sites including this free ARTICLE from a friend and colleague, Michelle James.  Many hospital sites also offer a brief summary of the diagnosis.  In my practice, it is not common that patients come to the office with a diagnosis of symbrachydactyly.  In fact, that almost never happens.  Most patients are labeled as having amniotic band or constriction band syndrome incorrectly.

While there are a few classifications of symbrachydactyly, this one, to me, summarizes the different forms best:
  1. short finger
  2. cleft type (thumb and small finger present)
  3. peromelic (nubbins)
  4. monodactyly (only the thumb present)
  5. wrist bones present (but nothing more distal)
  6. wrist bones absent (ie, arm ends at the end of the forearm)
  7. transforearm (amputation at mid forearm level)

For this discussion, I would like to focus on the short finger type of symbrachydactyly (Type 1).  That is, patients with a thumb and four fingers but with shorter digits than expected (brachydactyly meaning short finger)  The size of the digits can vary dramatically and can include a failure of some of the bones to form or shorter bones than expected.  These patients also have webbing between the fingers (thus the name symbrachydactyly rather than just brachydactyly).

These two images help to show a relatively mild form of symbrachydactyly with short digits and a surgically corrected webbing between the fingers.

Symbrachydactyly after deepening of the spaces between the fingers.


Symbrachydactyly x-rays showing short middle phalanges

These x-rays demonstrate short middle phalanges which account for the overall short digits.  See the red arrow on the middle phalanx.  The metacarpals (in the hand) are normal, the proximal phalanges are normal, and the distal phalanges are normal or near normal.  But the middle phalanges are short, as expected, in this mild form of symbrachydactyly- thus making the overall finger length less than expected.  While the digits are short, function is typically excellent and surgery to address the length is not recommended.  The only surgery for patients with this type of symbrachydactyly is what has been provided for this patient- a correct of the syndactyly or webbing.

Charles A. Goldfarb, MD
My Bio at Washington University
congenitalhand@wudosis.wustl.edu

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Saturday, March 30, 2019

Sprengel Deformity Outcome


Sprengel deformity is the presence of a high- riding shoulder blade (scapula).  I have previously blogged about it HERE (although it has been awhile).  Sprengel deformity is uncommon although the exact incidence is unclear.  It can be associated with a number of conditions including Klippel Feil (cervical spine vertebrae fusions), scoliosis, and other less common conditions (although all of these are very rare).  We believe it occurs during early development.  All of us start with the shoulder blades resting high in the neck and then, during fetal development, the shoulder blades migrate/ travel down to their final position in the upper back.  There may be abnormal tissue or even bony connection between the shoulder blade and the spine (it is unclear if this is cause or effect). 


Patients with a Sprengel deformity present with a bulge in the posterior neck- the shoulder blade.  They typically have limited shoulder motion including the ability to bring the arm from their side and in front of them.  Specifically, both motions may be limited to prevent the hand and arm from reaching high above the patient.  There is rarely pain.  The motion limitation is determined by the severity of the Sprengel deformity. 




Sprengel Deformity on the patient's right side.  
Sprengel Deformity on the patient's right side. 

Treatment
While therapy can be utilized to work on motion in Sprengel deformity, most patients with motion limitations and the notable neck bulge are treated with surgery.  The goal of surgery is to bring the shoulder blade down from the neck, back into its position in the upper back.  Because the shoulder blade is always smaller than the ‘normal’ one, the sides are never exactly symmetrical.  The surgery we utilize is the Modified Woodward procedure although there are several similar surgeries which can be effective.  We prefer a younger age for surgery but will typically treat patients aged 3-8 years or so.  The reason we prefer operating on younger children is because we feel that motion will improve more compared to treatment in older kids.

Finally, while the goal of surgery is to improve motion, a secondary benefit (an important one) is the improvement in appearance.  Sprengel deformity does cause a real ‘bulge’ in the neck which is quite noticeable.  Surgery definitely improves this although, as noted above, the shoulder blades typically appear asymmetrical due to the fact the affected one is smaller than the ‘normal’ one (although this is only visible without a shirt).  One important consideration in surgery is for the surgeon to avoid the temptation to bring the shoulder blades ‘level’.  This can increase the risk of a nerve stretch injury.

The patient below is after surgery for Sprengel deformity and the size difference in her shoulder blades is clear.   However, her motion is much improved, as is the appearance of her neck.  Unfortunately, the improvement in her neck bulge is hidden by her hair.


Patient with Sprengel Deformity on her right, after surgery



Patient with Sprengel Deformity on her right, after surgery



Charles A. Goldfarb, MD
My Bio at Washington University
congenitalhand@wudosis.wustl.edu

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