Abstract
Purpose
Wearing high heels is associated with chronic pain of the neck, lower back and knees. The mechanisms behind this have not been fully understood. The purpose of this study was to investigate the influence of high-heeled shoes on the sagittal balance of the spine and the whole body in non-habitual wearers of high heels.
Methods
Lateral standing whole body low-dose radiographs were obtained from 23 female participants (age 29 ± 6 years) with and without high heels and radiological parameters describing the sagittal balance were quantified. These were analyzed for differences between both conditions in the total sample and in subgroups.
Results
Standing in high heels was associated with an increased femoral obliquity angle [difference (Δ) 3.0° ± 1.7°, p < 0.0001], and increased knee (Δ 2.4° ± 2.9°, p = 0.0009) and ankle flexion (Δ 38.7° ± 3.4°, p < 0.0001). The differences in C7 and meatus vertical axis, cervical and lumbar lordosis, thoracic kyphosis, spino-sacral angle, pelvic tilt, sacral slope, and spinal tilt were not significant. Individuals adapting with less-than-average knee flexion responded to high heels by an additional increase in cervical lordosis (Δ 5.8° ± 10.7° vs. 1.8° ± 5.3°).
Conclusions
In all participants, wearing high heels led to increased flexion of the knees and to more ankle flexion. While some participants responded to high heels primarily through the lower extremities, others used increased cervical lordosis to adapt to the shift of the body’s center of gravity. This could explain the different patterns of pain in the neck, lower back and knees seen in individuals wearing high heels frequently.
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Appendices
Appendix 1: measured and derived (high heels (HH) minus barefoot (SL) differences) radiological parameters
The table below summarizes the quantified radiological parameters under barefoot and high heels conditions, as well as the parameters derived from the intra-individual high heels minus barefoot differences. The rightmost column contains the between-conditions correlation coefficients [r(BF, HH)] as well as the paired t test p values of the differences between the conditions.
Parameter | N | M | SD | Min. | Max. | [r(BF, HH)] p |
---|---|---|---|---|---|---|
SL C7 sagittal vertical axis (cm) | 23 | −0.09 | 1.90 | −3.4 | 3.2 | |
HH C7 sagittal vertical axis (cm) | 23 | −0.62 | 2.28 | −4.1 | 3.7 | [0.59] |
Δ C7 sagittal vertical axis (cm) | 23 | −0.53 | 1.93 | −3.4 | 3.6 | 0.2008 |
SL Meatus sag. vert. axis (cm) | 22 | −1.61 | 2.35 | −6.7 | 1.7 | |
HH Meatus sag. vert. axis (cm) | 23 | −1.09 | 2.66 | −5.1 | 5.7 | [0.19] |
Δ Meatus sag. vert. axis (cm) | 22 | 0.64 | 3.20 | −4.7 | 8.1 | 0.3582 |
SL Cervical lordosis (°) | 23 | 0.52 | 9.87 | −18.0 | 17.0 | |
HH Cervical lordosis (°) | 23 | −1.70 | 14.83 | −37.0 | 22.0 | [0.80] |
Δ Cervical lordosis (°) | 23 | −2.22 | 9.17 | −25.0 | 12.0 | 0.2589 |
SL Thoracic kyphosis (°) | 23 | 32.91 | 7.90 | 13.0 | 49.0 | |
HH Thoracic kyphosis (°) | 23 | 32.26 | 8.52 | 12.0 | 48.0 | [0.84] |
Δ Thoracic kyphosis (°) | 23 | −0.65 | 4.65 | −8.0 | 8.0 | 0.5080 |
SL Lumbar lordosis (°) | 23 | −58.87 | 9.47 | −77.0 | −46.0 | |
HH Lumbar lordosis (°) | 23 | −58.83 | 10.18 | −77.0 | −42.0 | [0.91] |
Δ Lumbar lordosis (°) | 23 | 0.04 | 4.26 | −8.0 | 10.0 | 0.9614 |
SL Spino-sacral angle (°) | 23 | 133.83 | 7.51 | 120.0 | 156.0 | |
HH Spino-sacral angle (°) | 23 | 134.22 | 6.97 | 120.0 | 150.0 | [0.90] |
Δ Spino-sacral angle (°) | 23 | 0.39 | 3.31 | −7.0 | 5.0 | 0.5768 |
SL Pelvic incidence (°) | 23 | 54.26 | 10.04 | 33.0 | 70.0 | |
HH Pelvic incidence (°) | 23 | 54.26 | 10.04 | 33.0 | 70.0 | [1.00] |
Δ Pelvic incidence (°) | 23 | 0.00 | 0.00 | 0.0 | 0.0 | n.a. |
SL Pelvic tilt (°) | 23 | 11.78 | 6.88 | −1.0 | 21.0 | |
HH Pelvic tilt (°) | 23 | 12.57 | 6.01 | 1.0 | 22.0 | [0.90] |
Δ Pelvic tilt (°) | 23 | 0.78 | 3.00 | −5.0 | 7.0 | 0.2239 |
SL Sacral slope (°) | 23 | 42.48 | 7.19 | 32.0 | 62.0 | |
HH Sacral slope (°) | 23 | 41.65 | 7.42 | 28.0 | 55.0 | [0.92] |
Δ Sacral slope (°) | 23 | −0.83 | 2.99 | −7.0 | 6.0 | 0.1994 |
SL Spinal tilt (°) | 23 | 91.78 | 2.56 | 87.0 | 96.0 | |
HH Spinal tilt (°) | 23 | 92.74 | 3.22 | 86.0 | 98.0 | [0.58] |
Δ Spinal tilt (°) | 23 | 0.96 | 2.72 | −4.0 | 7.0 | 0.1060 |
SL Femoral obliquity angle (°) | 22 | −6.77 | 2.16 | −11.0 | −1.0 | |
HH Femoral obliquity angle (°) | 23 | −3.78 | 2.19 | −8.0 | 0.0 | [0.72] |
Δ Fem. ob. angle (°) | 22 | 3.00 | 1.66 | 0.0 | 7.0 | <0.0001 |
SL Knee flexion angle (°) | 22 | −5.50 | 3.62 | −12.0 | 2.0 | |
HH Knee flexion angle (°) | 23 | −3.26 | 3.91 | −10.0 | 3.0 | [0.72] |
Δ Knee flexion angle (°) | 22 | 2.36 | 2.87 | −2.0 | 12.0 | 0.0009 |
SL Ankle flexion angle (°) | 22 | −1.50 | 1.92 | −4.0 | 2.0 | |
HH Ankle flexion angle (°) | 23 | 37.13 | 3.39 | 31.0 | 43.0 | [0.30] |
Δ Ankle flexion angle (°) | 22 | 38.73 | 3.40 | 31.0 | 44.0 | <0.0001 |
Appendix 2: subgroup analysis
Description of the high heels minus barefoot difference values of the radiological parameters in the two subgroups obtained by splitting the sample at the mean of the knee flexion angle (2.36°). The column “Adaptation Knee” signifies below-average (n = 12) by “No”, and above-average knee flexion (n = 10) by “Yes”. The difference of the means of the two subgroups is contained in the difference column, along with its 95 % confidence interval (CI confidence interval, LL lower limit, UL upper limit). Statistical significance at the local 5 %-level can be concluded from the CIs when they do not cover the null difference. For convenience, unpaired t test p values are provided in brackets for the differences in means.
Parameter | Adaptation knee | N | M | SD | 95 % CI | Difference (p) | 95 % CI | ||
---|---|---|---|---|---|---|---|---|---|
LL | UL | LL | UL | ||||||
Δ C7 sagittal vertical axis (cm) | No | 12 | 0.01 | 1.96 | −1.24 | 1.25 | 0.96 | −0.72 | 2.63 |
Yes | 10 | −0.95 | 1.80 | −2.24 | 0.34 | (0.2464) | |||
Δ Meatus sagittal vertical axis (cm) | No | 12 | 1.13 | 2.84 | −0.67 | 2.94 | 1.08 | −1.87 | 4.04 |
Yes | 10 | 0.05 | 3.65 | −2.56 | 2.66 | (0.4567) | |||
Δ Cervical lordosis (°) | No | 12 | −5.83 | 10.74 | −12.66 | 0.99 | −7.63 | −14.99 | −0.28 |
Yes | 10 | 1.80 | 5.31 | −2.00 | 5.60 | (0.0459) | |||
Δ Thoracic kyphosis (°) | No | 12 | −1.42 | 4.74 | −4.43 | 1.59 | −1.92 | −6.15 | 2.32 |
Yes | 10 | 0.50 | 4.74 | −2.89 | 3.89 | (0.3560) | |||
Δ Lumbar lordosis (°) | No | 12 | 1.33 | 3.92 | −1.15 | 3.82 | 2.63 | −1.19 | 6.46 |
Yes | 10 | −1.30 | 4.57 | −4.57 | 1.97 | (0.1700) | |||
Δ Spino-sacral angle (°) | No | 12 | −0.33 | 3.55 | −2.59 | 1.92 | −1.13 | −3.98 | 1.72 |
Yes | 10 | 0.80 | 2.86 | −1.25 | 2.85 | (0.4186) | |||
Δ Pelvic tilt (°) | No | 12 | 0.42 | 3.68 | −1.92 | 2.75 | −0.58 | −3.22 | 2.05 |
Yes | 10 | 1.00 | 2.16 | −0.55 | 2.55 | (0.6516) | |||
Δ Sacral slope (°) | No | 12 | −0.50 | 3.66 | −2.82 | 1.82 | 0.40 | −2.19 | 2.99 |
Yes | 10 | −0.90 | 2.08 | −2.39 | 0.59 | (0.7518) | |||
Δ Spinal tilt (°) | No | 12 | 0.08 | 2.35 | −1.41 | 1.58 | −1.62 | −4.02 | 0.79 |
Yes | 10 | 1.70 | 2.95 | −0.41 | 3.81 | (0.1782) | |||
Δ Femoral obliquity angle (°) | No | 12 | 2.00 | 1.04 | 1.34 | 2.66 | −2.20 | −3.36 | −1.04 |
Yes | 10 | 4.20 | 1.48 | 3.14 | 5.26 | (0.0013) | |||
Δ Ankle flexion angle (°) | No | 12 | 39.42 | 3.03 | 37.49 | 41.34 | 1.52 | −1.58 | 4.62 |
Yes | 10 | 37.90 | 3.79 | 35.20 | 40.61 | (0.3200) |
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Weitkunat, T., Buck, F.M., Jentzsch, T. et al. Influence of high-heeled shoes on the sagittal balance of the spine and the whole body. Eur Spine J 25, 3658–3665 (2016). https://doi.org/10.1007/s00586-016-4621-2
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DOI: https://doi.org/10.1007/s00586-016-4621-2