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Herbert Screws

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exnihilo
577806.  Thu Jul 02, 2009 11:27 am Reply with quote

Timothy James Herbert is an orthopaedic surgeon and specialist on the scaphoid bone of the wrist. He invented the Herbert Screw, which is a titanium screw designed to aid the knitting together of fractures of said bone. It is canulated to allow the flow of blood which keeps the bone alive and is intended to remain permanently inside the patient. Scaphoid fractures account for around 60% of broken wrists and often go undetected for weeks or even months as patients frequently assume they've simply sprained their wrist. If not treated, though, the bone can die resulting in loss of use of the affected hand, so the humble Herbert Screw has been a virtual lifesaver for many people.

I find them QI, as I now have one, so I thought I'd share.

 
smiley_face
578552.  Sat Jul 04, 2009 2:50 am Reply with quote

The scaphoid has an odd blood supply, in that it's fed by a small vessel that enters from the far side of the bone and passes backwards to supply it. As a result, fracture of the waist of the scaphoid can result a condition called avascular necrosis, where the bone tissue in that fragment dies from lack of oxygen and nutrients.

In addition, most fractures of the scaphoid are generally not visible on an x-ray until about 2 weeks after the incident, which can delay diagnosis and treatment.

One of the key signs of scaphoid fracture is tenderness in the anatomical snuffbox. This is the indentation on the thumb-side of your wrist which becomes extra apparent when you stretch your thumb out.

 
Janet H
579639.  Mon Jul 06, 2009 11:59 am Reply with quote

So much for 'Intelligent Design'!

 
Celebaelin
579993.  Tue Jul 07, 2009 5:03 am Reply with quote

smiley_face wrote:
One of the key signs of scaphoid fracture is tenderness in the anatomical snuffbox. This is the indentation on the thumb-side of your wrist which becomes extra apparent when you stretch your thumb out.

Which is particularly inconvenient as it makes it painful to do tequila slammers.

 
gerontius grumpus
598381.  Tue Aug 11, 2009 4:15 pm Reply with quote

The significance of cannulated screws, whether Herbert, Garden or any other type, is that they are introduced over a guidewire, nothing to do with bloodflow.

Sadly the eponymous titles of orthopaedic fixations are falling out of use these days, to be replaced by purely functional or trademark names.

 
bobwilson
598421.  Tue Aug 11, 2009 7:07 pm Reply with quote

Janet H wrote:
So much for 'Intelligent Design'!


Hey - even God's allowed a day off sometimes

 

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