Estimate how much height scoliosis takes from your Cobb angle, and how tall you would be without the curve, using published models in cm or inches.

Kono and Stokes use one curve; Bjure uses the largest (major) curve.

The curve angle from your X-ray report. The Kono model needs at least 30ยฐ.

Add it to estimate your height without the curve. Blank skips that result.

Optional settings

Scoliosis Height Loss Formula

The displayed default formula is the one-curve reduction of Kono. Full original Kono uses ฮฃ(Cobbแตข โˆ’ 30), subtracting 30 for each included curve; one major angle cannot represent the full multi-curve model. The Stokes option is its original single-curve polynomial, while Bjure uses the major curve. These population regressions differ and do not establish an individualโ€™s actual height loss. Inversion is educational algebra, not a measured or clinically validated diagnostic Cobb prediction; the Stokes single-curve inverse can have two positive solutions, which the calculator reports together. Optional measured height is added only to show a model-adjusted height, not true stature or achievable treatment gain.

HL (cm) = [0.6 ร— (CA โ€“ 30) + 2.6] รท 10

Variables:

  • HL is the estimated height loss (cm)
  • CA is the selected curve angle in degrees: one curve for the retained Kono and Stokes options, or the major curve for Bjure.

What is Scoliosis Height Loss?

Scoliosis height loss refers to the reduction in a person's measured height due to curvature of the spine. The Cobb angle is a standard measure of curvature severity and can be used in research-based equations to estimate how much height may be โ€œlostโ€ from spinal curvature. This can help with general understanding and support discussions with a clinician.

How to Calculate Scoliosis Height Loss?

The following steps outline how to estimate the Scoliosis Height Loss.

  1. First, obtain the relevant clinician-measured Cobb angle in degrees and select the matching curve model. This calculator retains >0โ€“180ยฐ as a mathematical guard and โ‰ฅ30ยฐ for its one-curve Kono option; these are not claimed as clinically validated ranges.
  2. For the Kono one-curve option, use HL (cm) = [0.6 ร— (CA โ€“ 30) + 2.6] รท 10.
  3. For optional model-adjusted height, add the modeled loss to measured height. This arithmetic sum does not predict gain from surgery, bracing or exercise.
  4. Finally, convert the result into your preferred unit if needed.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

Kono one-curve example: Cobb angle (CA) = 40 degrees

Measured height = 170 cm

Estimated height loss (HL) โ‰ˆ 0.86 cm

Model-adjusted height โ‰ˆ 170.86 cm. This is not an expected treatment result.