The patient has been suffering from pinched nerve roots of his lumbar spine since 1992, secondary to a herniated L4-L5 disc. He underwent surgery in 1993 consisting of removal of the covering of his L3 & L4 vertebrae (a.k.a. laminectomy) -- yes, L3 & L4, not L4 & L5. Why L3 was opened is anybody's guess. The point is, no discectomy (i.e., removal of the bulging disc) was ever done for L4-L5. So in essence, his L4 and L5 nerve roots continued to be compressed by the large disc herniation inside the foraminal canals (where the nerve roots pass through, on their way out of the spinal column).
Aside from weakness of his leg & foot muscles due to the compression at L4-L5, the patient has also been slowly developing weakness of the lower thigh muscles -- probably an effect of the growing compression of his L3 nerve roots (due to degenerative changes of the facet joints at the L3-L4 level).
This video was taken a day before I did full decompression surgery on his lumbar spine (a transforaminal lumbar interbody fusion at L4-L5 level, but with transforaminal decompressions & posterior instrumented fusions of L3-L4 and L5-S1 levels as well).
"Foot drop is characterized by STEPPAGE GAIT. While walking, people suffering the condition drag their toes along the ground or bend their knees to lift their foot higher than usual to avoid the dragging. This serves to raise the foot high enough to prevent the toe from dragging and prevents the slapping." ...
"To accommodate the toe drop, the patient may use a characteristic tiptoe walk on the opposite leg, raising the thigh excessively, as if walking upstairs, while letting the toe drop. Other gaits such as a wide outward leg swing (to avoid lifting the thigh excessively or to turn corners in the opposite direction of the affected limb) may also indicate foot drop."