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Cobb Angle: From Measurement to Treatment Decisions

The Cobb angle is a mathematical measurement tool for assessing the curvature of the spine. Along with physical exams and other tests, how is it used to evaluate scoliosis and kyphosis of the spine?

Cobb Angle

The Cobb angle is used to quantify the curvature of the spine, particularly in conditions like scoliosis. It measures the degree of side-to-side spinal curvature, a deformity called scoliosis. The angle’s size helps determine what kind of treatment is needed. Monitoring may be all that’s necessary for mild curvature. With severe scoliosis, treatment may require spinal fusion surgery. Named for orthopedic surgery pioneer John Robert Cobb, it describes the distance a scoliotic curve may deviate from being straight. (Botterbush K. S. et al., 2023) Generally, it takes at least 10 degrees of deviation from straight before scoliosis is confirmed.

X-Ray and Interpretation

An X-ray is taken to measure the Cobb angle. Side and back views are taken. The healthcare provider or examiner then views the X-rays and locates the most affected vertebra in the curve, called the apical vertebra. In a scoliotic curve, the apical vertebra is the spinal bone with the greatest degree of rotation that takes the biggest curve away from the center of a normal spine column.

Visualizing the Angle

The apical vertebra is where two lines drawn from the X-rays meet. Two lines are drawn along the edge of the top and bottom bones of the curve. The lines extend out as follows:

  • On the top bone, the line starts on the high side, continues along the top edge, and then slopes down according to the angle of the vertebra. (Jin, C. et al., 2022)
  • On the bottom vertebra, the line starts on the low side, continues along the bottom edge, and slopes upward.
  • The Cobb angle is found by measuring the angle of the two intersecting lines where they meet.

Then, the top and bottom vertebrae of the side-to-side curve are identified to create a number for the Cobb angle. These bones have the most tilt but the least rotation and displacement and are located above and below the apical vertebra. Computer software is commonly used to calculate the Cobb angle. (Jin, C. et al., 2022) Treatment is based on the:

10 Degrees Cobb Angle 

Scoliosis is diagnosed when the Cobb angle reaches 10 degrees or more. However, this is not generally considered a significant curvature (American Association of Neurological Surgeons, 2024). In around 80% of cases, the scoliosis is considered idiopathic or without congenital or other underlying causes.

Less Than 25 Degrees Cobb Angle

If a scoliotic curve is less than 25 degrees, individuals may only need to visit their healthcare provider periodically so long as the scoliosis is monitored. These are mild cases, often without symptoms, but there is a chance that the curvature can progress. This usually means reassessing the Cobb angle every four to six months in a growing child or adolescent. (National Scoliosis Foundation, 2015) A 5-degree or more progression can change the diagnosis and treatment. (Jin, C. et al., 2022)

Between 25 and 40 Degrees Cobb Angle

A Cobb angle of 25 to 40 degrees usually requires wearing a back brace and intensive physical therapy. The goal of these treatments is to help halt the curve’s progression. Braces are generally worn 16 to 23 hours every day. (National Scoliosis Foundation, 2015) The healthcare provider will provide a referral for physical therapy. Many report excellent results with the Schroth or other scoliosis-specific exercise methods. A study found that core stabilization exercise programs can decrease Cobb angles in adolescents with idiopathic scoliosis. (Ko K. J. & Kang S. J. 2017)

Scoliosis in Adults

Scoliosis is diagnosed in adults, usually in those who have had the condition, treated or not, that was identified in their youth. A study that followed various cases for 20 years found disease progression occurred in 40% of adults but was usually less than one degree per year. However, degenerative scoliosis can also occur in individuals aged 65 and older. (American Association of Neurological Surgeons, 2024)

40 Degrees or More Cobb Angle

Surgery may be recommended once the Cobb angle reaches 40 to 50 degrees. A spinal fusion is often used to force the curve to stop developing. In adults, surgery may be needed if the angle reaches 50 degrees and they experience complications, such as nerve damage or bowel/bladder dysfunction. Risk factors in adults include older age, a history of smoking, and a diagnosis of other conditions, including being overweight. (American Association of Neurological Surgeons, 2024)

Variations

Variations occur in measuring scoliosis, and it is important to understand the difference between a change in scoliosis and a change in the tools or measurement. Equipment errors, imaging errors, and the subjective reading of the healthcare provider can change the values. (Jin, C. et al., 2022) Scoliosis measurement software and intelligent medical devices continue to improve how scoliosis is evaluated and treated. Physical exams, symptoms, and careful monitoring of changes in posture or function are still critical to an accurate diagnosis. The healthcare provider will explain the Cobb angle and other test results.

Injury Medical Chiropractic & Functional Medicine Clinic

Injury Medical Chiropractic and Functional Medicine Clinic works with primary healthcare providers and specialists to develop an optimal health and wellness solution. We focus on what works for you to relieve pain, restore function, and prevent injury. Regarding musculoskeletal pain, specialists like chiropractors, acupuncturists, and massage therapists can help mitigate the pain through spinal adjustments that help the body realign itself. They can also work with other medical professionals to integrate a treatment plan to resolve musculoskeletal issues.

Academic Low Back Pain: Impact and Chiropractic Solutions

References

Botterbush, K. S., Zhang, J. K., Chimakurty, P. S., Mercier, P., & Mattei, T. A. (2023). The life and legacy of John Robert Cobb: the man behind the angle. Journal of neurosurgery. Spine, 39(6), 839–846. https://doi.org/10.3171/2023.7.SPINE23146

Jin, C., Wang, S., Yang, G., Li, E., & Liang, Z. (2022). A Review of the Methods on Cobb Angle Measurements for Spinal Curvature. Sensors (Basel, Switzerland), 22(9), 3258. https://doi.org/10.3390/s22093258

National Scoliosis Foundation. (2015). Scoliosis Media & Community Guide. https://www.scoliosis.org/nsf2/wp-content/uploads/2015/06/ScoliMediaGuide_9June3.pdf

American Association of Neurological Surgeons. (2024). Scoliosis. https://www.aans.org/patients/conditions-treatments/scoliosis/

Ko, K. J., & Kang, S. J. (2017). Effects of 12-week core stabilization exercise on the Cobb angle and lumbar muscle strength of adolescents with idiopathic scoliosis. Journal of Exercise Rehabilitation, 13(2), 244–249. https://doi.org/10.12965/jer.1734952.476

By admin 0 Comments Chiropractic Care, Therapy , , , , , , , , , , , , , , , , , , ,

Exploring Nociceptors: Detecting and Reacting to Pain

Can understanding how nociceptors function and their role in processing pain signals help individuals who are managing injuries and/or living with chronic pain conditions?

Nociceptors

Nociceptors are nerve endings that detect harmful stimuli, such as extreme temperatures, pressure, and chemicals, and signal pain. They are the body’s first defense against potentially damaging environmental inputs.

  • Nociceptors are in the skin, muscles, joints, bones, internal organs, deep tissues, and cornea.
  • They detect harmful stimuli and convert them into electrical signals.
  • These signals are sent to the brain’s higher centers.
  • The brain interprets the signals as pain, which prompts the body to avoid the harmful stimulus.

Nociceptors, often called pain receptors, are free nerve endings all over the body. They play a pivotal role in how the body feels and reacts to pain. The main purpose of a nociceptor is to respond to damage to the body by transmitting signals to the spinal cord and brain. (Purves D, Augustine GJ, Fitzpatrick D, et al., editors. 2001) If you bang your foot, the nociceptors on the skin are activated, sending a signal to the brain via the peripheral nerves to the spinal cord. Pain resulting from any cause is transmitted this way. Pain signals are complex, carrying information about the stimuli’s location and intensity. This causes the brain to fully process the pain and send communication back to block further pain signals.

Classification

There are different classes of nociceptors, which are based on which type of stimuli they respond to (University of Texas McGovern Medical School, 2020)

Thermal

  • Thermal nociceptors respond to extreme hot or cold temperatures.
  • For instance, when touching a hot stove, the nociceptors, which signal pain, are activated immediately, sometimes before you know what you’ve done.

Mechanical

  • Mechanical nociceptors respond to intense stretching or strain, such as pulling a hamstring or straining a tendon.
  • The muscles or tendons are stretched beyond their ability, stimulating nociceptors and sending pain signals to the brain.

Chemical

  • Chemical nociceptors respond to chemicals released from tissue damage.
  • For example, prostaglandins and substance P or external chemicals like topical capsaicin pain creams.

Silent

  • Silent nociceptors must be first activated by tissue inflammation before responding to a mechanical, thermal, or chemical stimulus.
  • Most visceral nociceptors are located on organs in the body.

Polymodal

  • Polymodal nociceptors respond to mechanical, thermal, and chemical stimuli.

Mechano-thermal

  • Mechano-thermal nociceptors respond to mechanical and thermal stimuli.

Pain Transmission

Nociceptors are also classified by how fast they transmit pain signals. Transmission speed is determined by the type of nerve fiber known as an axon a nociceptor has. There are two main types.

  • The first type is A fiber axon, fibers surrounded by a fatty, protective sheath called myelin.
  • Myelin allows nerve signals/action potentials to travel rapidly.
  • The second type is C fiber axons, which are not surrounded by myelin and transmit slower. (University of Texas McGovern Medical School, 2020)

Because of the difference in transmission speed, the pain signals from the A fibers reach the spinal cord first. As a result, after an acute injury, an individual experiences pain in two phases, one from the A fibers and one from the C fibers. (Ngassapa D. N. 1996)

Pain Perception Phases

When an injury occurs, the stimulated nociceptors activate the A fibers, causing a person to experience sharp, prickling pain.

  1. This is the first phase of pain, known as fast pain, because it is not especially intense but comes right after the stimulus.
  2. During the second phase of pain, the C fibers are activated, causing an intense, burning pain that persists even after the stimulus has stopped.
  3. The fact that the C fibers carry burning pain explains why there is a short delay before feeling the sensation.
  4. The C fibers also carry aching, sore pain caused by organs within the body, such as a sore muscle or stomachache. (Ngassapa D. N. 1996)

Injury Medical Chiropractic and Functional Medicine Clinic

Injury Medical Chiropractic and Functional Medicine Clinic works with primary healthcare providers and specialists to build optimal health and wellness solutions. We focus on what works for you to relieve pain, restore function, prevent injury, and help mitigate issues through adjustments that help the body realign itself. They can also work with other medical professionals to integrate a treatment plan to resolve musculoskeletal problems.

From Injury To Recovery With Chiropractic Care

References

Purves D, A. G., Fitzpatrick D, et al., editors. (2001). Nociceptors. In Neuroscience. 2nd edition. (2nd ed.). Sunderland (MA): Sinauer Associates. https://www.ncbi.nlm.nih.gov/books/NBK10965/

University of Texas McGovern Medical School. (2020). Chapter 6: Pain Principles. https://nba.uth.tmc.edu/neuroscience/m/s2/chapter06.html

Ngassapa D. N. (1996). Comparison of functional characteristics of intradental A- and C-nerve fibres in dental pain. East African medical journal, 73(3), 207–209.