Condromalacia and disc buldge in back.

Hi I have condromalacia grade 3 and mild OA changes in right knee apart from knee pain I have burning sensation in thighs while standing and sitting on chair also my feets are burning tingling and numbness. This does not allow me to walk much and do physiotheray for my knee recovery. Also when i do quad excercises for knee strengthening pain pattela hurts.please note I don't have back or hip pain Please advise if my burning due to below MRI results of my lumber. Please advise excercises for condromalacia grade 3 in left knee and early OA changes in my right knee. 1) Diffuse L4L5 dise bulge on background primary canal compromise causing mild central canal compromise, mildly indenting on bilateral traversing nerve roots within lateral recess and mildly indenting on bilateral exiting nerve within foramen 2) Posterior central L5S1 disc bulge indenting on right traversing nerve root within lateral recess. No central canal compromise Thanks