Fragility fracture of the fourth rib in a patient with a cardiac pacemaker: an uncommon case

PURPOSE: In patients with a cardiac pacemaker, pocket-related complications such as nerve impairment or bone fractures are infrequent. We present a man with a fracture of the 4th rib several months after pacemaker implantation. CASE PRESENTATION: A 74-year-old man, with a left prepectoral pacemaker implanted 13 months ago, presented complaining of chest pain. The pain started after a sudden trunk rotation and right arm flexion movement with a crack. There was tenderness to palpation and crepitation over the left upper ribs. Computed tomography identified a non-displaced fracture line in the anterior aspect of the left 4th rib. After kinesiotaping and activity restriction, pain alleviated. CONCLUSION: Pacemaker implantation might have caused shoulder dysfunction and pectoral tightness resulting in reduced flexibility of the trunk. Consequently, a reaching motion of the arm with a trunk rotation might have directed rotational force vectors towards the osteopenic left 4th rib causing a fragility fracture. In elderly with a pacemaker, osteopenia and concomitant sarcopenia may create a predisposition to this atypical complication.