You may be aware that the lower back has five units termed the lumbar vertebrae. The lowest of these, numbered L5 (lumbar five) rests on a block of bone called the sacrum. The report shows that the L5 vertebra has slipped forward on the sacrum. It also shows that the ring of the L5 vertebra is partially deficient along its rear - medically termed SPONDYLOLYSIS. (Lysis suggests loss of, or deficiency of) You do not have spondylosis - by which term is implied degenerative disease of the vertebrae and the intervertebral discs. As regards treatment, much will depend on your symptoms and the findings elicited by your physician. If the symptoms be mild and there be no neurological signs, exercises and other simple forms of treatment may suffice.