[Expert Solution]: An 18 years-old man fell on his knee while…

An 18 years-old man fell on his knee while playing basketball. The knee was painful, but the overlying skin was unbroken. The knee was swollen and remained painful the next day, so he was taken to the local emergency department. Clear fluid was aspirated from the knee, and the physiclan prescribed symptomatic treatment. Two days later, the swelling returned, the pain increased, and erythema developed over the knee. Because the patient also felt symptomatically