A 70-year-old male with left knee pain which is worse at the end of the day
A 70-year-old male with left knee pain which is worse at the end of the day and associated with morning stiffness of 20 minutes duration. His x-ray is below:

Image source: Wiki Commons
Which of the following changes on imaging is responsible for the presentations above? Select the SINGLE most appropriate option from the list above.
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