Hello, I have studied your case history. Traumatic hit injury can lead to bruise due to hematoma formation. If there is fracture in your leg bone then it is difficult to walk on it You will need X ray of knee and leg. Clinical examination is important to rule out knee ligament injury For these symptoms analgesic like ibuprofen and chymotrypsin medication can be started. Apply crepe bandage over leg or use supportive splint. Do ice fomentation and rest to leg. Hope this answers your query. If you have additional questions or follow up queries then please do not hesitate in writing to us. I will be happy to answer your queries. Wishing you good health. Take care.