I

A drop-foot pattern associated with weak anterior tibial muscles

II

Characterized by knee flexion throughout stance due to a functionally tight gastrocnemius with normal hip extension

III

Persistent knee and hip flexion due to functionally tight gastrocnemius and hip flexors

IV

Knee hyperextension and ‘tibial arrest’ associated with a functionally tight soleus

V

Persistent ankle dorsiflexion with knee hyperextension, the latter compensates for weak or spastic quadriceps