Review Question - QID 214842

Figures A and B are the radiographs of a 73-year-old female who sustained a ground level fall 3 days ago while walking out from the grocery store. She is relatively healthy, with a past medical history only significant for hypertension and hypothyroidism. Prior to this fall she lived independently. On physical exam she has significant ecchymosis extended from the proximal arm to the elbow. Distally she is NV intact. Sensation over the axillary nerve is intact. Which of the following is the most appropriate treatment for this patient?