Anatomy and function in the lumbar region involve the vertebral bodies L1 through L5, intervertebral discs that absorb load, facet joints that guide motion, and ligaments that stabilize the spine. The core muscles, including the erector spinae, multifidus, quadratus lumborum, and psoas major, support posture and movement. The lumbar spine is particularly subject to mechanical stress from lifting, twisting, and prolonged sitting, and it plays a key role in transferring forces between the upper body and pelvis.
Common lumbar-related conditions include acute or chronic lumbar strain, lumbar disc herniation with radiculopathy, spinal stenosis, spondylolisthesis, degenerative disc disease, and sacroiliac joint dysfunction. Symptoms may involve localized back pain, leg pain or numbness, weakness, or altered reflexes, and radicular signs often follow nerve root distributions.
Diagnosis typically combines patient history with physical examination and imaging. X-rays assess alignment, MRI reveals soft tissues and nerve involvement, and CT provides detailed bone information. Nerve testing may be used in selected cases.
Treatment is generally conservative at first, including physical therapy, activity modification, and nonsteroidal anti-inflammatory drugs or acetaminophen. When radicular pain persists, injections such as epidural steroids may be considered, and surgery (such as discectomy, decompression, or fusion) is reserved for select cases of persistent instability or neurological compromise.
Prognosis varies; many lumbar-related issues improve with appropriate care, though some become chronic. Risk factors include age, obesity, smoking, and occupations involving heavy lifting or prolonged vibration. Prevention focuses on core strengthening, flexible and safe movement, posture, and ergonomic practices.