Avoid sitting Cross legged. Avoid Squatting- Quadriceps Exercises- Lie straight, make a towel role and put it under the knee, press the keen against the role, hold it for 20 secs. Repeat 20 times twice a day. This will help relieve some pain. Core Strengthening Exercise- Straight Leg Raised With Toes Turned Outward, repeat 10 times, twice a day.

With this physiotherapy treatment and strength exercises

Start with knee strengthening exercises.  Sending you the android  link of the same below https://play.google.com/store/apps/details?id=com.technoherpes.kneepain Or you can search for "knee pain relieving exercises by Dr kavin khatri " on google store

Are you sure he had said fracture of knee cap?? Guess you require to get repeat x-ray done X-ray knee AP Lateral and Skyline