5. Resistance Band Leg Extension
If the knee is having troubles tracking properly over the joint, then training the quadriceps and the surrounding can help a lot.
You don’t want to do this with lots of weight, but what you can do is to sit down on a chair, attach a resistance band to the leg of the chair and then raise that leg slowly and steadily against the resistance. If you feel any pain, then stop immediately.
You can also use this exercise using a resistance machine at the gym, but be careful!