Complete video https://www.youtube.com/watch?v=9jLUj46A7WU A back L1 fracture, often referred to as an L1 lumbar fracture, is a serious injury that can lead to the collapse of the spine. This condition is characterized by a cracked L1 vertebrae, which is one of the lumbar vertebrae in the lower back. A lumbar spine fracture, such as a broken lower vertebrae, can result from trauma or conditions that weaken the bone, like osteoporosis. Types of spinal fractures vary, but the most common is a comp