Spondylolisthesis is a condition in which a vertebra slips forward out of place. It typically occurs at the bottom of the spine, in the lumbar area. It is classified into one of 6 types: congenital, isthmic, degenerative, traumatic, post-surgical or pathological. The condition is also graded based...

Multiple sclerosis or MS is an immune-based inflammatory disease that affects the myelin, the protective cover of nerve fibers. This causes inflammation, scar tissue and/or lesions in the brain. MS can differ depending on what nerves are affected by demyelination. There are 4 different types of...