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Hello this is Dr. Salama MD,
Yes, most likely the amount of fibrous scar tissue is responsible for this random pain.
If the pain becomes significant, you may need an MRI to rule out any tendon/ligament issues and compare them to previous reports.
Till then I would do some sort of physical therapy to strengthen the muscles and tissues of the ankle.
Let me know if you have any other questions.
If not, please don't forget to leave a positive rating as that's the only way I get credit for answering your question.
If there's been a sudden and abrupt change in your ability to perform the same level of exercise then I would recommend an X ray as you may have a stress fracture.
Is there anything else I can answer for you?