Hi, thanks for writing to HCM.
A nerve injury
will recover spontaneously only when it a concussion injury
(neuropraxia). This type of injury may take around 3-6 months of time.
If it is physical severence or sectioning of the nerve (axonotmesis
or neurotmesis), the chances of recovery is very less.
Surgery is indicated for long standing foot drop with no improvement with physiotherapy
, braces or splints etc.
Either tendon transfer surgeries or ankle fusion are usually recommended.
Hope this information is helpful. Good day