Abstract
Background: This study was designed to assess the accuracy and repeatability of the Derks Calculation Method in the normal foot during walking.
Methods: Measurements were taken from 25 healthy subjects (age 32.0 ± 12.4), 23 females and 2 males, on five separate occasions at seven days, three weeks, three months, and nine months apart by means of a mid-gait method. Values were calculated for internal rotation (IR) and external rotation of the heel (ER), heel valgus/varus (HV), heel length (HL), heel width (HW), width of the midfoot (WM) and the forefoot (WF), and the length of the foot (LF).
Results: For all five separate occasions and in 87.5% of the parameters investigated, the coefficient of repeatability (CR, expressed as a percentage of the mean) was less than 5%. One parameter showed a high CR - heel valgus/varus (HV) was extremely high (>800%). The maximum 95% Confidence Interval (CI) for the five different occasions was no higher than 0.2 cm for IR, ER and HV with a standard error (SE) of 0.01 and >0.01 respectively. The maximum 95% CI for WF was 0.4 cm (SE 0.1), and for HW, WM and LF the maximum 95% CI was 0.7 cm (SE 0.1 or 0.2). HL showed the highest 95% CI (0.9 cm) with an SE of 0.2.
Conclusion: The Derks Calculation Method was found to be accurate and repeatable if HV was excluded, which renders this method a viable clinical tool in settings where sophisticated computerised systems are still unavailable.
| Original language | English |
|---|---|
| Number of pages | 4 |
| Journal | Foot |
| Early online date | 28 Mar 2019 |
| DOIs | |
| Publication status | E-pub ahead of print - 28 Mar 2019 |
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Keywords
- Accuracy
- Barefoot
- Calculation Method
- Derks
- Pressure
- Repeatability
Cite this
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Accuracy and repeatability of a semi-quantitative barefoot pressure measurement method for clinical use : The Derks Calculation Method. / Maetzler, M.; Bochdansky, T.; Abboud, R. J. (Lead / Corresponding author).
In: Foot, 28.03.2019.Research output: Contribution to journal › Article
TY - JOUR
T1 - Accuracy and repeatability of a semi-quantitative barefoot pressure measurement method for clinical use
T2 - The Derks Calculation Method
AU - Maetzler, M.
AU - Bochdansky, T.
AU - Abboud, R. J.
N1 - No Funding.
PY - 2019/3/28
Y1 - 2019/3/28
N2 - Background: This study was designed to assess the accuracy and repeatability of the Derks Calculation Method in the normal foot during walking.Methods: Measurements were taken from 25 healthy subjects (age 32.0 ± 12.4), 23 females and 2 males, on five separate occasions at seven days, three weeks, three months, and nine months apart by means of a mid-gait method. Values were calculated for internal rotation (IR) and external rotation of the heel (ER), heel valgus/varus (HV), heel length (HL), heel width (HW), width of the midfoot (WM) and the forefoot (WF), and the length of the foot (LF).Results: For all five separate occasions and in 87.5% of the parameters investigated, the coefficient of repeatability (CR, expressed as a percentage of the mean) was less than 5%. One parameter showed a high CR - heel valgus/varus (HV) was extremely high (>800%). The maximum 95% Confidence Interval (CI) for the five different occasions was no higher than 0.2 cm for IR, ER and HV with a standard error (SE) of 0.01 and >0.01 respectively. The maximum 95% CI for WF was 0.4 cm (SE 0.1), and for HW, WM and LF the maximum 95% CI was 0.7 cm (SE 0.1 or 0.2). HL showed the highest 95% CI (0.9 cm) with an SE of 0.2.Conclusion: The Derks Calculation Method was found to be accurate and repeatable if HV was excluded, which renders this method a viable clinical tool in settings where sophisticated computerised systems are still unavailable.
AB - Background: This study was designed to assess the accuracy and repeatability of the Derks Calculation Method in the normal foot during walking.Methods: Measurements were taken from 25 healthy subjects (age 32.0 ± 12.4), 23 females and 2 males, on five separate occasions at seven days, three weeks, three months, and nine months apart by means of a mid-gait method. Values were calculated for internal rotation (IR) and external rotation of the heel (ER), heel valgus/varus (HV), heel length (HL), heel width (HW), width of the midfoot (WM) and the forefoot (WF), and the length of the foot (LF).Results: For all five separate occasions and in 87.5% of the parameters investigated, the coefficient of repeatability (CR, expressed as a percentage of the mean) was less than 5%. One parameter showed a high CR - heel valgus/varus (HV) was extremely high (>800%). The maximum 95% Confidence Interval (CI) for the five different occasions was no higher than 0.2 cm for IR, ER and HV with a standard error (SE) of 0.01 and >0.01 respectively. The maximum 95% CI for WF was 0.4 cm (SE 0.1), and for HW, WM and LF the maximum 95% CI was 0.7 cm (SE 0.1 or 0.2). HL showed the highest 95% CI (0.9 cm) with an SE of 0.2.Conclusion: The Derks Calculation Method was found to be accurate and repeatable if HV was excluded, which renders this method a viable clinical tool in settings where sophisticated computerised systems are still unavailable.
KW - Accuracy
KW - Barefoot
KW - Calculation Method
KW - Derks
KW - Pressure
KW - Repeatability
UR - http://www.scopus.com/inward/record.url?scp=85063328316&partnerID=8YFLogxK
U2 - 10.1016/j.foot.2019.03.001
DO - 10.1016/j.foot.2019.03.001
M3 - Article
JO - Foot
JF - Foot
SN - 0958-2592
ER -