Abstract

Treating seizure-related shoulder injuries is challenging, and an evidence-based consensus to guide clinicians is lacking. The aim of this prospective single-center observational clinical trial was to evaluate the clinical results of a cohort of patients undergoing treatment of seizure-related shoulder injuries, to categorize them according to the lesion's characteristics, with special focus on patients with proximal humerus fracture-dislocations (PHFDs), and to define groups at risk of obtaining unsatisfactory results. We hypothesized that patients with a PHFD, considered the worst-case scenario among these injuries, would report worse clinical results in terms of the quick Disabilities of the Arm, Shoulder, and Hand questionnaire (qDASH) as compared to the other patients. Patients referred to a tertiary epilepsy center who have seizure-related shoulder injuries and with a minimum follow-up of 1 year were included. A quality-of-life assessment instrument (EQ-5D-5L), a district-specific patient-reported outcome measure (qDASH), and a pain assessment tool (visual analog scale [VAS]) were used for the clinical outcome evaluation. Subjective satisfaction and fear of new shoulder injuries was also documented. Categorization and subgroup analysis according to the presence and features of selected specific lesions were performed. A total of 111 patients were deemed eligible and 83 were available for follow-up (median age 38 years, 30% females), accounting for a total of 107 injured shoulders. After a median follow-up of 3.9 (1.6-8.2) years, overall moderate clinical results were reported. In addition, 34.1% of the patients reported a VAS score ≥35 mm, indicating moderate to severe pain, and 34.1% a qDASH score ≥40 points, indicating severe disability of an upper limb. These percentages rose to, respectively, 45.5% and 48.5% in the subgroup of patients with PHFDs and to 68.8% and 68.8% in patients experiencing posterior PHFD. Overall, 46.9% of the patients considered themselves unsatisfied with the treatment and 62.5% reported a persistent fear of a new shoulder injury. Patients with seizure-related shoulder injuries reported only moderate clinical results at their midterm follow-up. Older age, male sex, and absence or discontinuation of antiepileptic drug (AED) treatment were identified as characterizing features of patients with posterior dislocation episodes. In patients with PHFD, a tendency to worse clinical results was observed, with posterior PHFD patients emerging as a definite subgroup at risk of reporting unsatisfying results after treatment.

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