Generally, “tight” muscles are a result of an underlying disorder and not by themselves, the cause for symptoms.
There are no screws that protrude into the back of the neck. The anterior plate has screws that enter the vertebral bodies but nothing in the rear of the spine.
You might have facet generated pain if there is base of the skull symptoms.
A pseudoarthrosis can easily be determined by a set of X-rays including flexion/extension.
Donald Corenman, MD, DC is a highly-regarded spine surgeon, considered an expert in the area of neck and back pain. Trained as both a Medical Doctor and Doctor of Chiropractic, Dr. Corenman earned academic appointments as Clinical Assistant Professor and Assistant Professor of Orthopaedic Surgery at the University of Colorado Health Sciences Center, and his research on spine surgery and rehabilitation has resulted in the publication of multiple peer-reviewed articles and two books.