Hi, Thanks for writing in. Though neck surgeries work in most patient, a few of them might have post surgical reasons leading to a pop sound in the neck. This is especially more when doing activities that involve movements of the neck. It is likely a change that has developed during the healing process. There are many small ligaments and joints in the region of surgery and after surgery the area heals and might cause popping sounds. As pain is not there, it is not due to pinching of nerve roots or failure of surgery. Many people experience these popping sounds and with time it gets lesser. Please avoid doing heavy physical activities involving your spine. If at any time there is development of pain then please consult your doctor and you might require a MRI scan cervical spine after clinical examination. Please do not worry.