Hello, I have studied your case. As per your age and history there is possibility of soft tissue injury in knee. Most commonly meniscus injury occurs may be associated collateral ligament injury. You may need to do MRI knee to see for any functional defect. As per your symptoms you need to do physiotherapy and knee exercises to improve range of motion. Rest and ice fomentation along with supportive brace will help to reduce locking episode and pain. Small meniscus tear can be managed conservatively with physiotherapy with USG and TENS. Large meniscus injury can be managed by arthroscopic repair. Another possibility of patellar ligament tightness which can be evaluated clinically. 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.