LUMBAR IN INDIA
What is the Lumbar Spine?
The lumbar spine – or low back – is the third major region of the spine (Figure 1). Most people have five bones or vertebrae in the lumbar spine, although it is not unusual to have six. Each vertebra is stacked on top of the other and between each vertebra is a gel-like cushion called a disc (intervertebral disc). The discs help to absorb pressure, distribute stress, and keep the vertebrae from grinding against each other.
Normal Anatomy in India
The lumbar vertebral canal is roughly triangular in shape and is narrowest in its anteroposterior diameter in the axial plane. The average anteroposterior diameter of the lumbar canal in adults, as determined by anatomic and radiographic studies, ranges from 15 to 23 mm.4 The canal is bounded anteriorly by the posterior edge of the vertebral body including the posterior longitudinal ligament, which is closely apposed to the posterior vertebral body surface, laterally by the pedicles, posterolaterally by the facet joints and articular capsules, and posteriorly by the lamina and ligamenta flava (yellow ligaments).
entrapment of the cauda equina roots, which pass within the dural sac, can occur as a result of progressive hypertrophy of any of the osseocartilaginous and ligamentous elements surrounding the spinal canal. Moreover, the intervertebral disc, which is composed of a gelatinous, centrally located nucleus pulposus and a peripherally located annulus fibrosus, is prone to rupture or herniate posteriorly or posterolaterally as a result of degenerative changes or trauma, producing neural element compromise.
Vertebrae in India
The vertebral body is a thin ring of dense cortical bone. The vertebral body is shaped like an hourglass, thinner in the center with thicker ends. Outer cortical bone extends above and below the superior and inferior ends of the vertebrae to form rims. The superior and inferior endplates are contained within these rims of bone.
Pedicles in India
The pedicles are two short rounded processes that extend posteriorly from the lateral margin of the dorsal surface of the vertebral body. They are made of thick cortical bone.
Laminae in India
The laminae are two flattened plates of bone extending medially from the pedicles to form the posterior wall of the vertebral foramen. The Pars Interarticularis is a special region of the lamina between the superior and inferior articular processes. A fracture or congenital anomaly of the pars may result in a spondylolisthesis.
Intervertebral Discs in India
Intervertebral discs are found between each vertebra. The discs are flat, round structures about a quarter to three quarters of an inch thick with tough outer rings of tissue called the annulus fibrosis that contain a soft, white, jelly-like center called the nucleus pulposus. Flat, circular plates of cartilage connect to the vertebrae above and below each disc. Intervertebral discs separate the vertebrae, but they act as shock absorbers for the spine. They compress when weight is put on them and spring back when the weight is removed.
Intervertebral discs make up about one-third of the length of the spine and constitute the largest organ in the body without its own blood supply. The discs receive their blood supply through movement as they soak up nutrients. The discs expand while at rest allowing them to soak up nutrient rich fluid. When this process is inhibited through repetitive movement, injury or poor posture, the discs become thinner and more prone to injury. This may be a cause of the gradual degeneration of the structure and function of the disc over time.
Facet Joints in India
Joints between the bones in our spine are what allow us to bend backward and forward and twist and turn. The facet joints are a particular joint between each vertebral body that help with twisting motions and rotation of the spine. The face joints are part of the posterior elements of each vertebra. Each vertebra has facet joints that connect it with the vertebrae above and the vertebrae below in the spinal column. The surfaces of the facet joints are covered with smooth cartilage that help these parts of the vertebral bodies glide smoothly on each other.
Ligamentum Flavum in India
The ligamentum flavum is a strong ligament that connects the laminae of the vertebrae. The term “flavum” is used to describe the yellow appearance of this ligament in its natural state. The ligamentum flavum serves to protect the neural elements and the spinal cord and stabilize the spine so that excessive motion between the vertebral bodies does not occur. It is the strongest of the spinal ligaments and often has a thinner middle section. Together with the laminae, it forms the posterior wall of the spinal canal.
Spinal Cord in India
The spinal cord is part of the central nervous system of the human body. It is a vital pathway that conducts electrical signals from the brain to the rest of the body through individual nerve fibers. The spinal cord is a very delicate structure that is derived from the ectodermal neural groove, which eventually closes to form a tube during fetal development. From this neural tube, the entire central nervous system, our brain and spinal cord, eventually develops. Up to the third month of fetal life, the spinal cord is about the same length as the canal. After the third month of development, the growth of the canal outpaces that of the cord. In an adult the lower end of the spinal cord usually ends at approximately the first lumbar vertebra, where it divides into many individual nerve roots (L1).
Spinal Canal in India
The spinal canal is the anatomic casing for the spinal cord. The bones and ligaments of the spinal column are aligned in such a way to create a canal that provides protection and support for the spinal cord. Several different membranes enclose and nourish the spinal cord and surround the spinal cord itself. The outermost layer is called the “dura mater,” which is a Latin term that means “hard mother,” indicating that early anatomists had at least a rudimentary sense of humor. The dura is a very tough membrane that encloses the brain and spinal cord and prevents cerebrospinal fluid from leaking out from the central nervous system. The space between the dura and the spinal canal is called the “epidural space”. This space is filled with tissue, vessels and large veins. The epidural space is important in the treatment of low-back pain, because it is into this space that medications such as anesthetics and steroids are injected in order to alleviate pain and inflammation of the nerve roots.
Types Of Surgery For Lumber Spine in India : –
The lumbar spine refers to the portion of the spine that’s located in the lower back. Spinal surgery is typically performed only as a last resort after medication and supportive treatment have failed to maintain an acceptable quality of life.
Fusion Surgery in India
- Fusion surgery uses a bone graft which causes adjacent vertebrae to grow into a single bone. This surgery is most effective when only two vertebrae are fused together.
- A fusion between the fifth lumbar and first sacral (L5-S1) is the most common type of fusion surgery. It doesn’t change the back’s mechanics significantly because the movement between these two vertebrae is very limited to begin with.
L4-L5 Fusion in India
- The L4-L5 segment is also a common site for fusion surgery. This segment normally allows a significant amount of motion and the operation will noticeably reduce the spine’s flexibility.
Artificial Disc Replacement
- A degenerated disc may be removed and replaced with an artificial disc. This can maintain more of the spine’s normal motion and reduce the stress on adjacent spinal segments.
The greatest risk for fusion surgery is misidentifying the source of the patient’s pain and therefore performing unnecessary surgery. Artificial disc replacement is a relatively new procedure, so the long-term risks aren’t well-understood.