A pop sound can indicate a tear in the muscle or a pulling of the muscle or tendon in that area. A tear would cause continuous pain and difficulty walking, so running would be very difficult. As you are still able to run this suggests a possible muscle or ligament strain. These do take time and rest to resolve as it is difficult to rest this muscle group completely can take months to heal. I would suggest you see your GP for diagnosis, they may be able to refer you to a physiotherapist, and this can aid recovery. Hopefully this will help you.
Answered by the Health at Hand nurses
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