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. 2012 Jun;12(3):182-3.
doi: 10.1136/practneurol-2011-000167.

Knee bobbing in Charcot-Marie-Tooth disease

Alexander M Rossor  1 , Sinead Murphy, Mary M Reilly
Affiliations

Knee bobbing in Charcot-Marie-Tooth disease

Alexander M Rossor et al. Pract Neurol. 2012 Jun.

Abstract

Patients with Charcot-Marie-Tooth (CMT) disease most commonly have a slowly progressive neuropathy where ankle dorsiflexion weakness is much more prominent than ankle plantar flexion weakness. The eventual involvement of the ankle plantar flexors has major functional consequences for patients as they lose the ability to stand still. We have found the knee bob sign whereby both knees bob up and down when standing still to be a reliable marker of ankle plantar flexion weakness in CMT.

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Conflict of interest statement

Competing interests

None.

Figures

Figure 1
Figure 1
Note the flexed knee posture which is characteristic of the knee bob sign seen in Charcot–Marie–Tooth patients with ankle plantar flexion weakness.
See this image and copyright information in PMC

References

    1. Larner A. A Dictionary of Neurological Signs. 3. London: Springer; 2011. p. 205.

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