1. Download free Tapatalk for iPhone or Tapatalk for Android for your phone and follow the SDN forums with push notifications.
    Dismiss Notice
Dismiss Notice
Hey Texans—join us for a DFW meetup! Click here to learn more.

Surgeon unclear on the concept

Discussion in 'MSK and EMG Case Discussions' started by PMR 4 MSK, Dec 23, 2008.

  1. PMR 4 MSK

    PMR 4 MSK Large Member
    SDN Advisor 5+ Year Member

    Joined:
    Oct 1, 2007
    Messages:
    4,182
    Likes Received:
    24
    Status:
    Attending Physician
    Pt referred for EMG RUE, order reads "R/O Radial tunnel syndrome, Dx - hand numbness."

    Umm, ok.

    Which resident or med student out there can tell us what's wrong with that order? Attendings can't answer yet...
     
  2. Note: SDN Members do not see this ad.

  3. cbest

    10+ Year Member

    Joined:
    Dec 9, 2006
    Messages:
    477
    Likes Received:
    119
    Status:
    Resident [Any Field]
    Second year medical student here...

    Based on my research, radial tunnel syndrome would present with more sharp or 'lancinating' pain over the dorsal forearm and/or lateral elbow, rather than hand numbness.

    Looking forward to hearing more about this and other cases!
     
  4. PMR 4 MSK

    PMR 4 MSK Large Member
    SDN Advisor 5+ Year Member

    Joined:
    Oct 1, 2007
    Messages:
    4,182
    Likes Received:
    24
    Status:
    Attending Physician
    that's partially true, very good start...
     
  5. topwise

    5+ Year Member

    Joined:
    Sep 6, 2007
    Messages:
    296
    Likes Received:
    1
    Status:
    Attending Physician
    I've never seen radial tunnel syndrome personally, but I thought it was a very similar presentation to lateral epicondylitis. Even though the superficial radial nerve does give sensation to the radial aspect of the dorsum of the hand, I believe it's the PIN that's compressed in radial tunnel syndrome, so sensation in the hand shouldn't be affected. Right?
     
  6. PMR 4 MSK

    PMR 4 MSK Large Member
    SDN Advisor 5+ Year Member

    Joined:
    Oct 1, 2007
    Messages:
    4,182
    Likes Received:
    24
    Status:
    Attending Physician
    Exactly. The presence of tingling in the hand precludes a Dx of RTS. RTS only affects the PIN, and thererfor is purely a motor problem. There can be pain from concominant tendonitis, muscle fatigue or neuritis, but in a pure RTS or PIN syndrome, weakness is the predominating symptom - weakness of extensors.

    RTS can be considered on the DDx of wrist drop, but proximal lesions are statistically more common, if only because humeral fracture is one of the most common causes or radial palsy. Since I work with a bunch of orthopods I see proximal radial neuropathy a few times a year. I've only ever seen a few cases of RTS/PIN I would reliably call, and only because of the needle exam.

    I'll do radial nerve stimulation, but it is very difficult to do and even harder to measure accurately. It often takes very high stimulations with surface stim which blows the take-off point to hell. It's so deep in the antecubital fossa that I often have to use 400 mcSec stims at 100 mA. Even in the forearm 200 mcSec is often needed. THe distances used are often quite short except in really tall people which brings about more error.

    I really only find the radial NCS to be of value in looking for recovery in terms of amplitude, or to see if any fibers reamin after wallerian degeneration should have stopped after proximal lesion.

    In the case of this pt, she had normal motor and sensory findings in the median, ulnar and radial nerves and a normal needle exam. She did have a very positive Tinel's over the superficial radial (sensory) nerve in the forearm, with radial-dermatome paresthesias, so I labeled it as EMG-negative radial sensory neuritis.
     
  7. DOctorJay

    10+ Year Member

    Joined:
    May 8, 2004
    Messages:
    2,836
    Likes Received:
    460
    Status:
    Attending Physician
  8. topwise

    5+ Year Member

    Joined:
    Sep 6, 2007
    Messages:
    296
    Likes Received:
    1
    Status:
    Attending Physician
    Interesting case! Thanks for posting.
     

Share This Page