Hi Karen,
I think the thumbnail image on the posterior cord syndrome slide might be deceiving. Posterior cord syndrome is a lesion isolated to the area of distribution of the posterior spinal artery, which is really just the dorsal column-medial lemniscus tracts.
In practice, things are rarely that clean and other tracts may be affected by a traumatic injury – but true posterior cord syndrome is isolated to sensory changes.
Chrissy