Once a patellar ligament injury occurs, the first step is to immobilize the area; stop all activities to prevent further damage and secondary injuries. Secondly, apply ice. The initial ice application should last from half an hour to an hour, applied directly to the injured patellar ligament. Thirdly, bandage to immobilize the area, primarily using an elastic bandage and cotton padding to compress the knee joint. This can help stop bleeding and limit swelling. Fourth, elevate the injured limb to at least 30 degrees above the level of the heart. After these measures, it's necessary to go to the hospital for further examination including physical assessments by a doctor, X-rays, or an MRI to fully understand the extent of the ligament damage. If there is a partial tear of the ligament without complete discontinuity, conservative treatment such as casting or bracing can be effective, typically for three to four weeks. However, if the ligament is completely torn and surgery is clearly indicated, surgical treatment should be followed by the use of a brace for six weeks. Thus, proper early management of a patellar ligament injury is crucial, followed by hospital evaluation. Additionally, since patellar ligament injuries often coincide with fractures or damage to other structures such as the meniscus or cruciate ligaments, these factors cannot be overlooked.