Hello,
Thank you for your query at DoctorSpring.com
Was there ever any injury to your hip?
Did you get an x ray?
Approximately since when have you been noticing this cracking/ popping sound?
It is not because of sitting on your wallet.
It is better to get an X-RAY of your left hip and based on the findings, if there are signs of any bone resorption we can evaluate your vitamin d levels. It could also be due to low vitamin d levels in your serum and that needs to be ruled out.
It could possibly be due to a ligament sprain but in that case the cracking or popping should not persist for so long.
Awaiting your reply,
Regards.