Well, without knowing the relevant clinical details or a detailed clinical evaluation it would be difficult to comment specifically on the situation. The current symptoms may be related to stiffness due to prolonged disuse, inflammation, complications such as scar formation etc. While physiotherapy may be useful for movement improvement, a review with your treating orthopedician may be required to rule out secondary issues before initiating one. I would suggest consulting your treating orthopedician for an evaluation and suggestion of an appropriate management plan.
Hope this is helpful.