D. M., a 25-year-old man, hops into the emergency department (ED) with complaints of right ankle pain. He states that he was playing basketball and stepped on another player's foot, inverting his ankle. You note swelling over the lateral malleolus down to the area of the fourth and fifth metatarsals, and pedal pulses are 3+ bilaterally. His vital signs (VS) are 124/76, 82, 18. He has no allergies and takes no medication. He states he has had no prior surgeries or medical problems. In assessing D. M.'s injured ankle, what should be evaluated?