hi, thank-you for providing the brief history of you. A thorough neuromuscular and musculoskeletal assessment is advised. As you had fall directly on the knee there might be some ligament sprain or a small hairline fracture of the patella. Getting an MRI of the knee will provide further inputs. Also, when the swelling occurs it s a protective mechanism , and if you have applied ice the swelling will come down. So post that the MRI reports or x-ray reports should come to a conclusion. i will recommend to do some physical therapy as it will help improve the strength and mobility of the knee joint. The reason to undergo MRI and physical therapy is to avoid future pain and aches. as most past knee injuries land to future damage of the knee joint. So on a safer side getting a complete rehabilitation of the knee is advised. rewards Jay Indravadan Patel