Hi Welcome to healhcaremagic After going through your query I concluded that your daughter got probably meniscus injury as it was occurred due to playing games and cracking sounds heard during movements. It needs MRI for confirmation. It may require operation intervention by arthroscopic surgery. Quadriceps excercises and analgesic such as ibuprofen are helpful non operative treatment. You can discuss your doctor about it. Hope your query get answered. If you have any clarification then please don t hesitate to write to us. I will be happy to answer your queries. You can also write to me directly on below link: https://www.bit.ly/askdrsudhirortho Wishing you good health. Take care.