Objective: To present a rare case with involuntary movements due to stump neuromas.

Background: Jumping stump syndrome is characterized by myoclonus or choreiform movements associated with injured peripheral nerves.

Method: A 56-year-old man presented to the outpatient clinic with pain and involuntary movements in the stump of his right amputated leg. He underwent a series of operations following a traffic accident that eventually resulted with a hip disarticulation 6 years earlier. Involuntary movements and pian began a few years after the amputation, which had been unresponsive to a wide range of medications as well as spinal cord stimulation and rendered him unable to wear his limb prosthesis.

Results: Neurologic examination was remarkable for irregular myoclonic jerks on his stump. Pelvic magnetic resonance imaging showed neuromas along sacral plexus. Neuromas from greater sciatic notch to perineum were excised but did not have any positive effects on myoclonic jerks. Given the unresponsiveness of the condition to previous threrapies, botulinum toxin type A injection was administered. No benefit was observed.

Conclusion: Jumping stump is a rare disturbing sequela of limb amputations caused by stump neuromas that develop at the ends of injured peripheral nerves. Relief of involuntary movements and refractory pain can be quite challenging.

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MDS Abstracts - https://www.mdsabstracts.org/abstract/jumping-stump/