Flexor tendon ruptures with closed distal radius fractures are rare. Little is known regarding the correlation between trauma and closed flexor carpi radius rupture. We report a case of a 68-year-old man who presented with a closed distal radius fracture. Intraoperatively, it was discovered that the flexor carpi radialis tendon had ruptured from the second metacarpal base. At the 16-month follow-up after surgical treatment, the range of motion of the left wrist had fully recovered.