Interdigital neuroma: intermuscular neuroma transposition compared with resection. Surgery of Morton's neuroma: dorsal or plantar approach? Effect of pronation and supination orthosis on Morton's neuroma and lower extremity function.
This prospective, randomized study compares the treatment of an interdigital neuroma (IDN) by the standard resection operation with a technique in which the IDN is transposed into the inter-muscular space between the adductor hallucis and the interossei muscles after division of the digital nerves distal to the IDN. The resection group contained 22 patients and 22 neuromas and the transposition group contained 22 patients and 23 neuromas. An interviewer, blinded as to the operative technique used, telephoned each patient preoperatively, and at 1 month, 3 months, 6 months, 12 months, and 36-48 months postoperatively. The interviewer recorded the patient's reported pain level on a numerical rating scale of 0 to 100. In the resection group the average pain level was slightly lower through the first 6 month period, but at the 12 month review the resection group had a slightly higher average pain level . At the 36-48 month survey the resection group again reported a greater average pain level and fewer asymptomatic patients. It was concluded that it is unnecessary to excise the IDN to obtain excellent relief of pain. It was also concluded that transposition of the IDN into an intermuscular position between the adductor hallucis and the interossei muscles produced significantly better long term results than did the standard resection operation. In this prospective study, 52 patients with 55 neuromas were studied in two groups. 26 patients underwent excision of the neuroma through a plantar approach and 26 through a dorsal approach. Average follow-up was 3.1 years after excision. Histology confirmed a neuroma in 51 cases. Results show that in the dorsal group weight-bearing and return to work was faster, and the duration of hospital stay was shorter, than in the plantar group. There were five painful scars in the plantar group and two in the dorsal group. Twenty-three adult patients with Morton's neuroma of one foot were randomized to receive in-shoe orthoses made from a hard, compressed, felt material that would either pronate or supinate both feet. The response of the neuroma pain was measured using subjective visual analogue scales, an objective examination, and the MACTAR patient-specific measure of maximal function. The development of any other lower limb symptoms was also recorded. The pain associated with Morton's neuroma was not significantly altered by changing the position of the foot with the compressed felt orthosis. Forcibly pronating the foot did not produce a significant incidence of lower limb symptoms in the short term.
There is insufficient evidence with which to assess the effectiveness of surgical and non-surgical interventions for Morton's neuroma. Well designed trials are needed to begin to establish an evidence base for the treatment of Morton's neuroma pain.