hi,
thank you for providing the brief history of you.
As you mentioned you had a major back surgery, for what the surgery was performed is to be known first. Also, taking to the pain the knee on the inner side, it could be a ligament
sprain. Which can be assessed by a special orthopedic tests as well, to confirm the same, the MRI will be of guidance. Also to provisionally understand the biomechanics of this
injury and pain, you have already mentioned about the major back surgery. Post back surgery, there is a need of
physical therapy to strengthen the muscles of the spine, core,
pelvic floor, lower
limbs as a whole. If it is not performed, then, the weight bearing joints like the hip, knee and ankle, which are below the waist line takes new biomechanical movements of weight shifting to avoid the strain on the surgical site in the back. Due to the weight shifting there is possibility of ligament sprain and and then the pain and inflammation. For the same pain of your current, you can undergo a physical therapy session like, Therapeutic
ultrasound therapy and
TENS therapy to reduce the pain and inflammation. Post which the exercises will be advised to further strengthen the muscles. On later stages performing the exercises will help you keep maintaining the muscular strength and avoid the pain in future. 99% of cases i have seen with similar issues recover and the functions are normal in day to day life.
I wish the same for you
Regards
Jay Indravadan Patel