Complex sentence: Baastrup's sign, or kissing spine, is an orthopedic and radiographic sign in the elderly in which there is enlargement of posterior spinous projections of the lumbar spine with normal intervertebral disc height and neuroforamina.
Split into simpler sentences: Baastrup's sign, or kissing spine, is an orthopedic and radiographic sign in the elderly. The disorder is characterized by enlargement of the posterior spinous projections of the lumbar spine, with normal intervertebral disc height and neuroforamina.