Drop Foot Gait / Steppage Gait:
Caused by substantial weakness or paralysis of anterior tibial muscles; can not dorsiflex foot at ankle during swing to clear the ground flex and lift knee in an exaggerated fashion so foot can clear the ground during swing phase. Forefoot usually ‘slaps’ on the ground and is supinated excessively at contact, pronating as bodyweight is applied. Appears to be stepping over an obstacle.
eg multiple sclerosis; injury; peroneal neuropathy