Corticosteroid injections are sometimes used for cases of plantar fasciitis refractory to more conservative measures. There is tentative evidence that injections may be an effective for pain relief in the first month but not after that.  Foot orthoses have been demonstrated as an effective method to reduce plantar fasciitis pain for up to 12 weeks.  The long-term effectiveness of custom orthotics for plantar fasciitis pain reduction requires additional study.  Orthotic devices and certain taping techniques are proposed to reduce pronation of the foot and therefore reduce load on the plantar fascia resulting in pain improvement. 
This may be considered in very difficult cases. Surgery is usually only advised if your pain has not eased after 12 months despite other treatments. The operation involves separating your plantar fascia from where it connects to the bone; this is called a plantar fascia release. It may also involve removal of a spur on the heel bone (calcaneum) if one is present. Surgery is not always successful. It can cause complications in some people so it should be considered as a last resort. Complications may include infection, increased pain, injury to nearby nerves, or rupture of the plantar fascia.