Review Question - QID 219459

A 58-year-old female presents with left foot pain and bunion deformity. After discussing the various available procedures, the patient undergoes a modified Lapidus procedure involving a metatarsocuneiform arthrodesis with a distal modified McBride procedure (Figure A). One year later, the patient presents with forefoot pain and abnormal callous formation along their foot in the area denoted (Figure B). What is the likely cause of this patient’s current symptoms?