What do 10 degrees, 20 degrees or 40 degrees mean in scoliosis? What is the Cobb angle? In this article, we explain the medical equivalents and classification of scoliosis degrees.
Following a spinal X-ray taken due to suspected scoliosis, the most confusing term families encounter in reports is usually the "Cobb Angle" and the numerical value next to it. Questions such as "Is 15 degrees serious?", "What does 40 degrees mean?", "Will this number increase?" form the basis of our outpatient consultations.
Gold Standard: What is the Cobb Angle?
The international measurement unit used worldwide to determine the severity of scoliosis is called the Cobb Angle. This measurement is calculated by measuring the angle between the uppermost vertebra where the curvature begins and the lowermost vertebra where it ends on an X-ray.
This angle gives us the "identity" of scoliosis. All classifications we discuss when following up our patients are made according to this degree.
Degrees and Classification of Scoliosis
Medically, not all spinal curvatures are assessed in the same category. We can examine the degrees of curvature under four main headings:
1. Spinal Asimetri (0 – 10 Derece Arası)
It is the most misunderstood group among the public. Many parents assume their child has scoliosis when the report states "7 degrees of curvature". However, according to medical literature, curvatures below 10 degrees are not considered scoliosis.
- Meaning: This is not a disease, but a condition of "postural asymmetry" or "non-structural curvature".
- Clinical Approach: It usually does not require treatment and can also be seen in healthy individuals. Monitoring is sufficient.
2. Mild Scoliosis (10–20 degrees)
When the Cobb angle exceeds 10 degrees, the diagnosis is officially termed "Scoliosis".
- Meaning: There is a slight curvature in the spine. It is difficult to detect from the outside through clothing.
- Clinical Approach: This group is the "Observation Group". The progression of the curvature is monitored at regular intervals according to the child's growth rate.
3. Moderate Scoliosis (20–40 degrees)
This stage is when the physical symptoms of scoliosis (uneven shoulders, hump in the back) begin to be more clearly visible from the outside.
- Meaning: The curvature is now evident not only on X-rays but also in physical appearance. In growing children, these degrees represent the range where the risk of progression is highest (the "risk zone").
- Clinical Approach: This stage is the period during which non-surgical measures (such as corsets and exercises) are most intensively evaluated. The aim is to prevent the curvature from progressing to a higher category.
4. Advanced Scoliosis (40 Degrees and Above)
Curvatures of 40-45 degrees and above are referred to as "Advanced" or "Severe Scoliosis".
- Meaning: At this point, the biomechanics of the spine and body balance are significantly affected.
- Klinik Etki: It is not merely an aesthetic issue; in very advanced cases reaching 70-80 degrees, the rib cage volume may decrease, potentially putting pressure on respiratory capacity. These degrees of curvature represent structural changes that require detailed planning by spinal surgeons.
More Important Than Numbers: "The Risk of Progress"
The most important detail a family needs to know is this: The child's age is as important as the degree of scoliosis.
For example;
- In an individual whose growth is complete (18 years old), a 20-degree scoliosis generally remains stable and does not pose a threat to life.
- However, a 20-degree scoliosis detected in a child aged 10 who is still in the early stages of their growth spurt carries a significant potential for progression.
Therefore, the number in the report does not mean anything on its own. Your doctor will interpret this number in conjunction with your child's bone age (Risser stage).
Frequently Asked Questions (FAQ)
Does the degree of scoliosis decrease on its own over time? In structural scoliosis (where the bones twist and bend), it is not medically expected that the degree of curvature will spontaneously "resolve" or decrease. However, with the correct exercises and posture corrections, "functional" (posture-related) increases can be reversed, which may appear as a partial improvement in the degree.
Does mild scoliosis cause pain? Interestingly, there is no direct correlation between the degree of scoliosis and the severity of pain. Someone with a 15-degree curvature may experience back pain, while another with a 50-degree curvature may feel no pain at all. Pain usually stems from muscle imbalance.
Can I measure the temperature at home? Home observations (forward bending test) only allow you to detect asymmetry. This degree, known as the Cobb angle, can only be measured on X-rays by specialist doctors using millimetric calculations. Measurements taken using mobile phone applications may be misleading.
Legal Notice: This content is for informational purposes only. It is not a substitute for diagnosis and treatment. Consult your doctor if you have any health concerns.
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