Lumbar Spine (Class 1) Flashcards
What is a very common complaint from patients regarding the lumbar spine?
Low back pain.
What is the primary function of the lumbar spine?
It helps to transmit the weight of the upper body to the pelvis and lower body.
When conducting assessments, what areas should include an evaluation of the lumbar spine?
Any spine, hip, or SI joint assessments.
Where does the lumbar spine begin in relation to the scapula?
It begins about 6 inches from the inferior angle of the scapula.
Describe the curvature of the lumbar spine.
The lumbar spine creates a lordotic curve before attaching to the sacral spine.
How many vertebrae make up the lumbar spine?
The lumbar spine is made up of 5 vertebrae.
What is located between the vertebrae of the lumbar spine?
Intervertebral discs (IVD).
How can the vertebrae and intervertebral discs (IVDs) be commonly described in a simplified analogy?
The vertebrae are commonly compared to hockey pucks, and the IVDs are compared to jelly donuts.
What is the role of the vertebrae in the lumbar spine?
The vertebrae allow for the attachment of muscles and ligaments that provide stability and mobility.
What is the function of the intervertebral discs (IVDs) in the lumbar spine?
The IVDs absorb and transmit axial loads and tensile stresses from one vertebra to another.
Which lumbar vertebra is the largest, and what is its significance?
The 5th lumbar vertebra is the largest and transmits forces from the upper extremities to the sacrum and pelvis.
Describe the shape and orientation of the 5th lumbar vertebra.
It has a wedge shape and forward orientation, allowing it to sit slightly backward/posteriorly and facilitate the normal lordotic curve.
At which lumbar levels does most movement occur?
Most movement occurs at the L4/5 and L5/S1 levels.
Why is the L4/5 and L5/S1 region a common area for problems in the lumbar spine?
Little obvious movement occurs due to the shape of the facet joints, tightness of the ligaments, pressure of the intervertebral discs, and size of the vertebral bodies.
Which segment of the vertebral column is the most common site for problems?
The L5-S1 segment is the most common segment for problems.
In which plane do the lumbar facet joints (apophyseal or zygapophyseal joints) sit?
The lumbar facet joints sit in the sagittal plane.
What movements are primarily allowed by the lumbar facet joints?
The available movements are flexion and extension, while rotation and side bending are very limited.
What are the roles of the lumbar facet joints?
They stabilize the spine, allow limited movement, and protect the intervertebral discs (IVDs) from shear forces.
How many pairs of lumbar facet joints are there, and what are their orientations?
There are 5 pairs (10 total) of lumbar facet joints, consisting of superior facets (facing medial and backward) and inferior facets (facing lateral and forward).
What is spondylosis?
Spondylosis is the degeneration of the intervertebral disc (IVD).
Define spondylolysis.
Spondylolysis is a defect in the pars interarticularis, characterized by a fracture between the lamina and pedicle, often visualized with the “Scottie dog” X-ray, typically resulting from overextension that presses the spinous processes together.
What is spondylolisthesis?
Spondylolisthesis is the forward displacement of one vertebra over another.
What is retrolisthesis?
Retrolisthesis is the backward displacement of one vertebra over another.
What percentage of the total length of the vertebral column is made up by the intervertebral discs?
Intervertebral discs make up approximately 25% of the total length of the vertebral column.
How do intervertebral discs change with age?
The total length of intervertebral discs decreases with age due to overall degeneration.
What are the two main parts of an intervertebral disc?
The annulus fibrosus (approximately 20 rings of crisscross collagenous fibers) surrounds the nucleus pulposus (an incompressible fluid).
What is herniation in relation to intervertebral discs?
Herniation is a general term used to describe any change in the annulus shape that causes it to protrude beyond its normal perimeter.
Define protrusion as it relates to intervertebral discs.
Protrusion occurs when the nucleus pulposus is only contained by the outer fibers of the annulus and supporting ligamentous structures.
What is prolapse in the context of disc injuries?
Prolapse refers to the rupture of nuclear material into the vertebral canal.
Describe extrusion concerning disc injuries.
Extrusion is the extension of nuclear material beyond the confines of the posterior longitudinal ligament or above and below the disc space, but still in contact with the disc.
What does sequestration mean regarding intervertebral discs?
Sequestration occurs when the extruded nucleus has separated from the disk and moved away from the prolapsed area.
What actions increase pressure in the L3 intervertebral disc?
- Walking: 15%
- Small jumps: 40%
- Laughing: 40-50%
- Bending forward: 150%
- Lifting 2kg with back straight: 73%
- Lifting 2kg with back bent: 169%
(Note: It is highly recommended to avoid laughing while taking a small jump with your back bent.)
What are some common lumbar injuries?
- Myelopathy (pressure on the spinal cord)
- Cauda equina syndrome
- Disc injury (most common between ages 15-40; only 5% of patients with low back pain have a disc problem; leg pain is more dominant if the disc is affected)
- Ankylosing spondylitis (more common between ages 18-45 and in men)
- Osteoarthritis and spondylopathies (more common in individuals 45+ years old)
- Malignancy (more common in individuals 50+ years old)
What is the resting position of the lumbar spine?
The resting position is midway between flexion and extension.
What is the close-packed position of the lumbar spine?
The close-packed position is full extension.
What is the capsular pattern of the lumbar spine?
The capsular pattern is characterized by side flexion and rotation being equally limited, with extension also limited.
What are the key components to include in a case history?
Primary complaint, general health, mechanism of injury (MOI), site or spread of pain, behavior of symptoms, duration, persistent pain indicators, and positions during activities.
What are the two types of mechanisms of injury (MOI)?
Traumatic and non-traumatic. Non-traumatic can include simple actions like putting on a sock.
What should be assessed regarding prior occurrences of pain?
Prior occurrences should include how they were treated and whether they resulted from mechanisms such as motor vehicle accidents (MVA), direct trauma, twisting, or lifting, and if there is pain with coughing.
What is local pain and what does it indicate?
Local pain tends to indicate a mechanical injury with unilateral pain and no referral below the knee, often involving muscles, ligaments, facet joints, or SI joints.
Describe radiating pain.
Radiating pain travels down the involved limb due to spinal nerve and/or root irritation, with specific areas affected by different lumbar levels: L4 affects the anterolateral aspect of the leg, L5 affects the posterior aspect of the foot, and disc lesions can cause pain into the leg below the knee.
What is referred pain and what are some examples?
Referred pain can arise from trigger points, visceral organs (e.g., prostate cancer), or systemic conditions (e.g., ankylosing spondylitis).
What symptoms might be associated with specific injuries?
- Pop or tearing: muscle injury
- Numbness: peripheral nerve or nerve root irritation
- Catching: muscle spasm or facet joint injury
- Tingling/warmth/coldness: nerve root or circulation issues
How is pain duration classified?
Acute: 3-4 weeks
Subacute: up to 12 weeks
Chronic: more than 3 months
What does persistent pain or progressive increases while supine indicate?
It may indicate a neurogenic issue or a space-occupying lesion (e.g., infection, swelling, or tumor).
What position increases pressure on the disc?
Sitting, due to sustained flexion.
What does standing represent in terms of spinal position?
Standing represents extension, especially when relaxed.
What is the spinal position when walking?
Walking also represents extension.
What spinal position is assumed when lying, especially in a prone position?
Lying, especially prone, represents extension, which creates posterior vertebral pressure.
What is the best sleep position for spinal health?
Side lying with legs bent in a semi-fetal position is the best for spinal health.
How does the supine position affect posterior vertebral pressure?
In the supine position, posterior vertebral pressure is released as the back flattens.
What are the key components to observe in a clinical assessment?
Regular landmarks, spinal posture, and upper and lower extremities landmarks.
What is the normal spinal posture in the lumbar spine?
The normal spinal posture in the lumbar spine features a lordotic curve.
What is meant by “neutral pelvis”?
Neutral pelvis refers to a position where the normal lordotic curve is maintained, with the anterior superior iliac spines (ASISs) being slightly lower than the posterior superior iliac spines (PSISs).
Why is it important to assess upper and lower extremities landmarks?
Assessing upper and lower extremities landmarks helps to ensure proper alignment and identify any potential imbalances or abnormalities.
What are the key components to assess during palpation?
Inflammation, heat, and deformities.