A 29-year-old male asked:
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is it true that false-negatives are sometimes seen with the thompson test and an intact plantaris muscle can produce plantar flexion? suspect rupture.

1 doctor answer
Dr. Michael Genkin
11 years experience Podiatry
Immediate evaluation: There are other tests to check for a rupture but even if you suspect it then you should be evaluated immediately. I would recommend an MRI.
Answered on Jan 5, 2019
1
1 comment
Dr. Vern Christensen
25 years experience Podiatry
I agree with my colleague-an MRI is the best test to determine a rupture. More directly to your question-anatomically and clinically-yes the intact plantaris muscle can produce plantar flexion of the foot with a Thompson test. It will be very weak, but can give plantar flexion. Again, agreeing with my colleague this should not be the determining test and you should seek further evaluation.
Feb 27, 2015

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Related questions:

A 34-year-old member asked:
Dr. Peter Ihle
53 years experience Orthopedic Surgery
It's because the--: -quad contracts as U try to Flex.U need 2 block it out of the equation. My trick was 2 have U sit on a couch cushion that U pull out so when U flex, U ... Read More
A 27-year-old male asked:
Dr. Vern Christensen
25 years experience Podiatry
Not toes, but foot.: The gastroc and soleus muscles do not plantarflex the toes they plantarflex the foot. These 2 muscle come together and form the achilles tendon attac ... Read More
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