Knee pain. For tissue damage. i!

Hi myself Akhil ...last year in month of May I met with a accident...after accident the injury of both of my legs were treated with medicine and legs were later fine. But from Jan 2019 my right knee started paining ..it's difficult for me to stand more than 5 min  ...then I met with a orthopedic specialist he told me that I was suffering from chornomalica after seeing my knee x-ray...he also advised me for physiotherapy. After taking medicine from last 3 month there was no improvement in my pain...so I decided to change the doctor. Then in month of September I met with another orthopedic specialist ...he also asked me to do x-ray. After seeing my x-ray he wrote some medicine for 1 month and told me that if medicine will not work then he will inject some injection in my knee to reduce inflammation. Doctor please tell me what basically happened inside my knee and why it's paining and difficult to stand. I am attaching my last 2 x-ray report and knee ultrasound for tissue damage. I