If X ray confirms there is no damage to bone or its covering, this may be due to a violent abnormal movement resulting in stretching of soft tissues like ligaments , muscle tendon etc. Normally strict rest with keeping the leg horizontally placed by lying down, keeping it on chair when sitting, avoiding walking and using stairs for considerable period helps. Medication for pain and to release stiffness may be necessary , provided precautions for acidity is taken . Your overweight may be another contributor. Hence more rest