A stump neuroma is one of the more serious and well-recognised complications of neuroma surgery. It occurs because nerves may try to attach themselves to something when they are cut. This results in a bud of nerve tissue forming at the end of the cut nerve, which can become hypersensitive.
Sometimes other complications can mimic a stump neuroma. In particular, some neuromas end up becoming embedded in scar tissue where they have been cut. Every time the toes bend forward this can pull on the scar and nerve and therefore cause significant pain.
Treatment for stump neuroma involves using cryosurgery or radiofrequency to desensitise the nerve before it becomes trapped. Some patients also have revision surgery to remove the nerve again via a plantar approach (at the bottom of the foot).