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It would be nice if you can share the MRI reports with us so we can comment accurately. In general, without the MRI, I suspect this to be a muscle injury, which is healing slowly. As MRI too have limitations, we have to follow the clinical signs and symptoms and treat according to the clinical symptoms.
This sounds to me as a muscle injury, due to which there is a muscle imbalance. I will advise undergoing muscle re-education, and muscle balance board training, which can help correct the actual action of the muscle and a proper torque can be applied with the contraction of the muscles. Later a graded practice of the lower limb will be good. If the nature of the pain is burning, tingling, radiating, and numbing, etc., that we may have to look out for any nerve root entrapment and treat accordingly. Please share the MRI reports if possible.