How long will a hairline fractured patella (knee cap) normally take to heal and what do I do to speed up the process?

6-8 weeks. A fracture usually takes 6-8 weeks to heal, but there are many factors that can slow this down. Smoking, use of certain medications and excessive motion can all slow down the process. Nothing you can eat or srink will speed the process, but quitting smoking, avoiding Ibuprofen or Naproxen and proper immobility will help maximize healing.