Morton's neuroma corresponds clinically to mechanical pain located preferentially between the 3rd and 4th toes. This pain results from a compression of the interdigital nerve located in the commissure at the base of the toes. The cause is frequently bursitis and, in chronic cases, a neuroma, i.e. a fusiform dilatation of the nerve in response to compression.

The involvement of FHL in this syndrome is related to the rolling of the foot towards the outside. Over time, the tissues atrophy and are no longer able to support the load, and symptoms appear. Women are more affected than men. The peak of occurrence is around 50 years of age.

The treatment usually proposed ranges from infiltration to excision of the nerve, including plantar supports and simple decompression of the nerve. However, particularly in early cases, tenolysis of the FHL may be suggested, with or without plantar support. This treatment has the effect of refocusing the stride and decreases the mechanical stress on the painful area.