The L5-S1 spinal motion segment, also called the lumbosacral joint, is the transition region between the lumbar spine and sacral spine in the lower back. In this region, the curvature of the spine changes …

Nov 1, 2023 · L5, the fifth lumbar vertebra, is the lowest and largest of the lumbar vertebrae, and it plays a central role in supporting the lower back and connecting the lumbar spine to the sacrum, forming a …

Apr 1, 2026 · The fifth lumbar vertebra (or the L5 vertebra) is the largest and most inferior of the lumbar vertebrae. As the last of the lumbar vertebrae, the L5 vertebra bears more body weight than any of …

Dec 14, 2025 · L5-S1 consists of the last bone in the lumbar spine (low back), called L5, and the triangle-shaped bone under it, known as the sacrum. The sacrum is made of five fused bones—S1 is …

2 days ago · An L4-L5 herniated disc – commonly known as Lumbar Disc Disease – can be a real pain for patients…and we see these herniated discs often. In fact, most disc herniations occur between …

Feb 17, 2022 · Your lumbar vertebrae, known as L1 to L5, are the largest of your entire spine. Your lumbar spine is located below your 12 chest (thoracic) vertebra and above the five fused bones that …

What Does L5 Back Pain Mean? L5 back pain refers to discomfort or pain in the lower back that can be traced to the fifth lumbar vertebra or its surrounding structures.

Nov 29, 2025 · Explore the L5 vertebra, the spine’s main weight-bearer. Learn its unique anatomy, nerve connections, and why it is prone to lower back pain.

Apr 1, 2026 · L5-S1 disc herniation occurs at the lumbosacral junction—the critical transition point between your lower spine and pelvis. This location bears more weight and stress than any other …

In this guide, we'll explore common lumbar spine problems at the L4-L5 and L5-S1 levels, their causes, symptoms, and available treatment options. Before diving into specific conditions, let's briefly review …