This paper presents the objective and quantitative measurement of muscle stiffness described by Rack and Lehmann. This method allows analysis of the pathophysiological mechanism of spasticity and assessment of anti-spastic treatment. This is illustrated by a case report, showing the objective effect of intrathecally administered baclofen in a spastic patient.
Detrembleur, C., Plaghki, L., & Lejeune, T. (1998). [Quantitative assessment of muscular stiffness at the ankle. Effect of intrathecal baclofen in a spastic patient.]. Neurochirurgie, 44(3), 197-200. https://hdl.handle.net/2078.5/141417 (Original work published 1998)