How long should a surgery site/scar remain sensitive? i had surgery on peroneus brevis 15/12/16 and the site is still very sensitive and numb in parts

Longterm if unlucky: Uncommon but can cut nerves and then you can be left with persistent symptoms. also can develop a regional pain syndrome where the nerves are not cut or damaged and the tissues heal but the nerves continue to be numb. There are some treatments that may work for pain to a certain degree but not numbness. A doctor consult might sort that out. All the best.

Up to 6 months: Most surgery scars can remain sensitive with altered sensation for up to 6 months as the nerve endings take a while regenerate. If there is abnormally increased pain it may indicate an infection developing and you should see your doctor for this.

Variable : During surgery nerves get cut and later on they regenerate . In some cases surgical site can become sensitive due to nerve irritation . Duration of this irritation is variable and can last for few months or few years too . People can sometimes develop chronic nerve pain too but there are medications to help with this .

Why not try : Treating the scar area? There are topical medications like recedo or even mederma can be tried. If scars continue to be painful intalesional steroid injections and or lasers can be used.