Hi,
A titanium rod left in the leg for 2 years would not be causing an acute
allergic reaction because the area would have had a long time to heal. However, there may irritation every time you hit any object with the rods or the screws.
This may happen when you bump the rod area into a table, chair, or any object. When this happens, a small swelling may start. This swelling can grow larger and continue to irritate the area.
Many people find icing the area useful to help reduce the swelling. Usually, it is best to ice the area for about 15 mins every hour till the area of swelling and pain numbs and the pain reduces.
In case this does not help, many people find using Over the Counter painkillers useful as well. However, if all these do not help, seeing a doctor for imaging may be needed.
Hope I have answered your query. Let me know if I can assist you further.
Regards,
Dr. Vignan Rachabattuni, General & Family Physician