Percussion Myotonia

Percussion Myotonia

Percussion myotonia is the myotonic response of a muscle to a mechanical stimulus, e.g., when struck with a tendon hammer. For example, a blow to the thenar eminence may produce involuntary and sustained flexion of the thumb. This response, which may be seen in myotonic dystrophy, reflects the impaired muscle relaxation which characterizes myotonia.

 

Cross References

Myotonia