Increased platelets count can be triggered when a relatively large amount of body tissue is damaged during surgery or after an accident.
Damaged tissue, and inflamed tissue after trauma (your surgery is trauma to your body), result in production of certain proteins that give signal to bone marrow for increased production of platelets.
This condition is known as reactive or secondary thrombocytosis, since the bone marrow is intact.
Formation of blood clots and bleeding are extremely rare in this type of thrombocytosis (they only occur when platelet count is over 1000 million per ml)
Infection can be cause for reactive thrombocytosis, too.
Talk with your physician or specialist for blood disorders (hematologist) to ease your mind!
Best wishes!
Marija