Distal Radius Case: Vet Fell Off His Bike

Distal Radius Case: Vet Fell Off His Bike

50 year old vet fell off his bike.

  • What do you see? 

  • What would you do in the emergency room for this?


Remember to use a system for reading your xrays. Read this post if you haven’t yet: System for reading wrist xrays 


Updates with answers coming later this week! Please comment below to weigh in and get the best out of the learning process!


Update:

Fracture Description

This is an AP and lateral of the left wrist in a skeletally mature individual with a ring finger comminuted metacarpal shaft fracture and a lunate dislocation.


Remember that you want to say what views, the maturity of bone, and what the most straightforward descriptions of the pathology.


Here is the lunate outlined in the images:


Photo Credit: Nina Suh@NinaSuh9 

It is especially easy to miss lunate and other carpal bone fractures especially if there is a distal radius fracture. That is why it is good to develop a system for ready xrays that you do consistently so you decrease the chances of missing something. You can’t trust the radiologist to read your images. You must be responsible.

ED Management

  • Ortho Interview

  • Good neurovascular exam

    • Carpal tunnel syndrome is a risk (the lunate in this case has been pushed into where you would expect the carpal tunnel to be)

  • Closed reduction with traction may be worth a try, but this is debated as it can increase swelling

    • I might want to try finger traps and just see if it would reduce after a while hanging with gravity

  •  Volar slab or sugar tong splint

    • Just for comfort, no reduction or specific mold necessary

  • Get a CT 

    • helpful to rule out other fractures that may not be visible on xray

Surgical Overview

There is some debate about approach and what people would do. Some would try percutaneous fixation with pins. Some would do a carpal tunnel release with repair of the capsule and ligaments with a dorsal and volar approach. 


The metacarpal fracture looks like it can be treated non-op right now based on angulation <30 degrees and less than 2-5mm of shortening.


Metacarpal fractures acceptable angulation


Acceptable Shaft Angulation (degrees)

Acceptable Shaft Shortening (mm)

Index & Long Finger

10-20

2-5

Ring Finger

30

2-5

Little Finger

40

2-5

Metacarpal Shaft Operative Indications (ORIF vs. CRPP) – according to Orthobullets

  • Open fractures

  • Unacceptable angulation

  • Multiple fractures

  • Any malrotation

    • When flexing fingers to the palm all fingers should point towards the scaphoid if there is malrotation that finger may not be pointing towards the scaphoid.


Some attendings may decide to pin that in place to avoid displacement later on. The important part of sharing this case is mainly to get used to recognizing that the Lunate is dislocated and to systematically go through your images.


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