 Spasticity is assessed by feeling the resistance of the muscle to passive lengthening in its most relaxed state.A spastic muscle will have immediately noticeable, often quite forceful, increased resistance to passive stretch when moved with speed and/or while attempting to be stretched out, as compared to the non-spastic muscles in the same person's body (if any exist).As there are many features of the upper motor neuron syndrome, there are likely to be multiple other changes in affected musculature and surrounding bones, such as progressive malalignments of bone structure around the spastic muscles (leading for example to the scissor gait and tip-toeing gait due to ankle equinus or ankle planter flexion deformity in spastic cerebral palsy children.