Thanks for posting your query.
If it is sprain
of ankle as told by your orthopaedic surgeon
after clinical examination , you have to follow the principal of RICE ( rest, ice fomatation, compression by creape bandage and elevation of limb ).
As your orthopaedic surgeon had said , you can go for MRI
to confirm the diagnosis and for grade of sprain. It helps to decide in definitive management ( conservative or surgical management ).
Avoid putting weight and rest well.
Wishing you good health.
Dr saurabh Gupta