I have persistent knee pain, along with popping in the knee. There is constant deep dull pain constantly & sharp pain when knee pops while walking, It feels almost like it s coming apart. Plus when my knee is bent will sitting or standing, it feels almost impossible to straighten it due to the intense sharp pain.
In my opinion you have ACL and medial meniscal tear, I recommend an MRI to confirm from your symptoms I can feel free to say you may need surgical treatment see an orthopedic doctor Good Luck