Hi Dear,
Welcome to HCM.
Understanding your concern. As per your query you have sharp knee pain caused after injury. Well the symptoms you mention in query can occur due to may reasons like
anterior cruciate ligament injury ,torn meniscus , knee bursitis , patellar
tendinitis , knee cap dislocation , fracture , hematoma and
rheumatoid arthritis . But in your case it seems to me the symptoms are probably due to ligament injury or knee cap injury . For now apply cold compresses for first 48 hours and then apply warm compresses to knee , take proper rest , drink plenty of water and elevate your legs while lying down . Doctor may also recommend
physical therapy . I would suggest you to consult orthopedic surgeon for proper diagnosis . Doctor may order X-ray , CT scans , ultrasound , MRI and blood tests to confirm the diagnosis . Doctor may recommend muscle strengthening exercises along with injection of a corticosteroid drug , orthodox MR and surgery like
arthroscopic surgery in severe damage .
Hope your concern has been resolved.
Get Well Soon.
Best Wishes,
Dr. Harry Maheshwari