A 35-year-old female presents to the orthopedic clinic 3 weeks after a fall on an outstretched hand with wrist extension. She complains of wrist pain, swelling over the distal forearm, and weakness of grip. On examination, there is tenderness over the distal radius and loss of wrist supination. X-rays show a fracture of the distal third of the radius with an associated dislocation of the distal radioulnar joint (DRUJ) confirmed on CT imaging. What is the most likely diagnosis?