
Lateral lunges, front lunges, half
squats, leg press, lateral step ups,
knee extension (90-40 degrees), hamstring curls, hip adduction and abduction, hip flexion and extension, toe raises, try all of these under an instructor. I would suggest you to apply ice packs regularly to decrease the pain and inflammation and take intermittent pain killers and go for an MRI and also a second opinion.
Take care!