Myelomalacia is a thinning of the spinal cord due to compression injury of the cord. This syndrome leads to myelopathy which by your symptom report you most likely have. See website for discussion of this disorder.
If the compression is still present, this does need to be addressed surgically. I cannot tell you if the surgery should be from the front or back of the spine. This depends upon many factors.
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.