Background: This case raises questions about the pathophysiology of muscle ruptures in highly functional patients with hereditary spastic paraplegia (HSP) who have only minor spasticity and no significant muscle shortening. Literature on the skeletal muscle changes secondary to spasticity or to the underlying disease, HSP, has been explored and compared with this clinical case. Two theoretical hypotheses are discussed. Firstly, chronic spasticity might be a risk factor for histopathological muscle alterations. Secondly, altered protein synthesis due to the underlying genetic mutation may play a role in the mechanical integrity of muscle tissue.
Case report: This is the first case report of a sequential bilateral complete disruption of the rectus femoris muscle after minimal trauma, in a 55-year-old man with HSP. Pain was the main complaint, without significant increase in spasticity. Walking ability was not significantly impaired. Conservative treatment resulted in resolution of the complaints.
Clinical rehabilitation impact: This unique case of a bilateral complete rectus femoris muscle rupture after minimal trauma in a patient with HSP presenting with minor spasticity raises questions on the pathophysiology of the skeletal muscle changes in HSP patients and more generally in spastic patients.